Q.P.-2015
Paper Code: UN412(1 - 24)
(Code: 412) Q.P.-2016
Paper Code: UN415(1 - 24)
(Set A - Code: 415) Q.P.-2016
Paper Code: UN418(1 - 24)
(Set B - Code: 418) Q.P.-2016
Paper Code: UN421(1 - 24)
(Set C - Code: 421)
Key & Solutions
Class–II
C L A S S : VI
Class : VI
Mathematics
The H.C.F. of two numbers is 12 and their difference is 12. What are the numbers? (A) 66, 78
(B) 70, 82
(C) 94, 106
(D) 84, 96
Nithin and Ashwin share 90 stamps in the ratio 2 : 3. How many stamps must Ashwin give to Nithin so that the ratio of Nithins stamps to Ashwins stamps becomes 5 : 4? (A) 7
(B) 14
(C) 21
(D) 28
In the given figure, find ∠ BAC. A 29
110 B
(A) 23o
C
(B) 33o
D
(C) 48o
48
(D) 70o
If a < 0, which of the following four numbers is the greatest? (A) a
(B) 2a
(C) 4a
(D) 8a
Space for rough work
Paper Code: UN412
1
C L A S S : VI
What fraction of the given figure is shaded?
(A)
1 18
(B)
1 16
(C)
1 9
(D)
1 8
Between the numbers 10 and 100, how many times will the digit 5 appear? (A) 18
(B) 19
(C) 20
(D) 21
The given figure is a solid consisting of identical cubes. What is the least number of cubes that can be added to the solid to form a cuboid?
(A) 11
(B) 19
(C) 21
(D) 34
Space for rough work
Paper Code: UN412
2
C L A S S : VI
In the given figure, rectangles A and B are of the same size. Each rectangle can fit two of square C exactly. Find the area of the given figure. 42 cm A
B C
(A) 630 cm2
(B) 980 cm2
(C) 420 cm2
(D) 70 cm2
Find the difference between 347890 and 23600 by rounding off each number to the nearest thousand. (A) 323000
(B) 324000
(C) 324900
(D) 325000
1000 pupils were asked to choose a sport as their co-curricular activity. The given table represents their choices.
How many pupils choose soccer? (A) 170
(B) 230
(C) 250
(D) 350
Space for rough work
Paper Code: UN412
3
C L A S S : VI
What is the missing number in the box? 1
2 5
(A) 21
1
2 5
1
2 5
(B) 2
1
2 5
7 5
(C) 3
1
2 5
(D) 4
If the product of five integers is negative, then, atmost how many of the five integers could be negative? (A) One
(B) Two
(C) Five
(D) Four
Which of the given integers have the maximum number of divisors? (A) 176
(B) 182
(C) 99
(D) 101
The given figure shows the outline of a plot of land.
(4x 8) m (x + 10) m
The cost of fencing is 14 per metre. If x = 5, find the total cost of fencing the plot of land. (A)
837
(B)
378
(C)
245
(D)
756
Rishi weighs 0.75 times as much as Nisha. Nisha weighs 0.8 times as much as Tina. If Tina is 16 kg heavier than Rishi, find their total mass. (A) 54 kg
(B) 85 kg
(C) 60 kg
(D) 96 kg
Space for rough work
Paper Code: UN412
4
C L A S S : VI
The given figure is made up of six identical triangles. Find the total area of the shaded parts. 8 cm
24 cm
(A) 48 cm2
(B) 96 cm2
(C) 144 cm2
(D) 288 cm2
The letter v, w, x and y represent numbers as shown on the given number line. Which of the following expressions has the least value? 1
v
(A) v + y
w
0
(B) v + x
x
(C) w + x
y
1
(D) v w
Keerthi needs 5 2 m of cloth to make a dress. She has only 3
1 3 of the required length. How much more cloth does she need? (A) 3.76 m
(B) 3.75 m
(C) 3.78 m
(D) 3.79 m
Two ropes of length 28 m and 36 m are to be cut into bits of same length. What is the greatest possible length of each bit? (A) 7 m
(B) 3 m
(C) 4 m
(D) 5 m
Space for rough work
Paper Code: UN412
5
C L A S S : VI
A restaurant has 19 tables that can seat a total of 84 people. Some of the tables seat 4 people and the others seat 5 people. How many tables seat 5 people? (A) 4
(B) 8
(C) 6
(D) 7
When a square piece of paper is folded into 2 equal halves, 2 rectangles are formed. If each rectangle has a perimeter of 24 cm, find the area of the square paper. (A) 46 cm2
(B) 24 cm2
(C) 64 cm2
(D) 32 cm2
What is the missing number in the box? 1.2 + 0.209 = 1 + 0.4 + 9
(A) 0.001
(B) 0.01
(C) 0.1
(D) 1.0
A, B and C are in the ratio 6 : 5 : 11. If the value of A is 42, what are the values of B and C respectively? (A) 35 and 77 (B) 30 and 66 (C) 21 and 27 (D) 12 and 18 Find the number of natural numbers divisible by 5 between 1 and 1000. (A) 197
(B) 199
(C) 198
(D) 200
How many more degrees of arc are there in than in (A) 9o
1 5
1 4
of a circle
of a circle? (B) 18o
(C) 24o
(D) 30o
Space for rough work
Paper Code: UN412
6
C L A S S : VI
Class : VI
Physics
A student saw a ball with three shadows and made a few conclusions about how they were formed. Which conclusion made by him is correct ? (A) The ball was placed between two sources of light. (B) The ball was being rotated under a light source. (C) The ball was placed under a light source at three different positions. (D) Three sources of light from different positions were shone on the ball. A compass-needle always points to the north as (A) it is made of a magnetic material. (B) it is a magnet with the pointer as the south seeking pole. (C) it is a magnet with the pointer as the north seeking pole. (D) it is an electromagnet that is charged by rubbing when the needle is turning. Two cyclists are approaching each other in opposite direction with a speed of 15 km/hour. Initially the distance between them is 60 km. How long will they take to hit each other ? (A) 1 hour
(B) 2 hours
(C) 3 hours
(D) 4 hours
Given below are four circuits P, Q, R and S with different arrangements of identical batteries and identical lamps. The lamps in all four circuits light up. Circuit P -
1 Ba ery
Circuit Q - 2 Ba eries
1 Bulb Circuit R -
2 Ba eries
3 Bulbs Circuit S - 1 Ba ery
1 Bulb
2 Bulbs
Identify the correct arrangement of the lamps P, Q, R and S from the brightest to the dimmest. (A) S, P, Q, R (B) R, P, Q, S (C) P, R, S, Q Paper Code: UN412
(D) Q, S, R, P 7
C L A S S : VI
Why can we see the stamps kept in an album clearly although there is a thin sheet of plastic covering them? (A) The plastic allows light to pass through it. (B) The plastic is non-magnetic. (C) The plastic is waterproof. (D) The plastic reflects light. Which type of battery is used in our mobile phones ? (A) Alkaline
(B) Lead-acid
(C) Nickel-cadmium
(D) Silver oxide-zinc
The given figure shows the measurement of an eraser.
What is the length of the eraser? (A) 3.0 cm
(B) 3.5 cm
(C) 4.0 cm
(D) 4.5 cm
What will happen when a piece of bar magnet is broken into two halves ? (A) The two halves will be demagnetised. (B) Each half will become an electromagnet. (C) Each half will be a magnet with two poles. (D) Each half will be a magnet with only one pole. What happens when light falls on a wooden chair ? (A) The shadow of the chair is not formed. (B) Light passes through the wooden chair. (C) Light is reflected from the chair to our eyes. (D) The chair is a transparent object. Paper Code: UN412
8
C L A S S : VI
The following are three types of measurements. Height
Length
Thickness
How are the measurements above similar ? (A) They cannot be measured using parts of the body. (B) They are all length measurements. (C) The standard unit is kilogram. (D) They are always measured in standard units. A metal bar is confirmed to be a magnet when it (A) attracts all metals.
(B) attracts another magnet.
(C) attracts a piece of iron. (D) repels a compass needle. The given figure is of a dry cell.
Which of the given parts is wrongly labelled ? (A) P
(B) R
(C) Q
(D) S
Identify the correct classification of all the three nonluminous objects. Opaque
Transparent
Translucent
(A)
Brick wall
Plastic light shade
Glass window
(B)
Plastic light shade
Glass window
Brick wall
(C)
Plastic light shade
Brick wall
Glass window
(D)
Brick wall
Glass window
Plastic light shade
Paper Code: UN412
9
C L A S S : VI
Two students X and Y used their finger spans to measure the length of their teachers table. Student X got 25 and Student Y got 31 finger spans for the same table. Which of the following is correct about the results ? (A) Measurement of Student X is more accurate than Student Y. (B) Different people have different sized body parts. (C) Student X measured the table length while Student Y measured the table width. (D) The students used standard units in their measurements. When a magnet is placed near a magnetic material, the magnetic material becomes a magnet. What is the name of this process ? (A) Electromagnetic induction (B) Electrostatic induction (C) Magnetic induction (D) Electromagnetism Identify the correct connection between the filament and the metal casing.
(A)
(B)
(C)
(D)
Which is the correct property of shadows formed by fabric, metal and clear glass ? Fabric
Metal
Clear glass
(A)
Dark shadow
Light shadow
No shadow
(B)
Light shadow
Dark shadow
No shadow
(C)
No shadow
Dark shadow
Light shadow
(D)
Light shadow
No shadow
Dark shadow
Paper Code: UN412
10
C L A S S : VI
Why magnets are able to keep the doors of the refrigerator shut despite the layer of rubber ? (A) The layer of rubber is very thick. (B) The layer of rubber is magnetic. (C) Magnetic force can pass through magnetic materials. (D) Magnetic force can pass through non-magnetic materials. What is the measure of length from a persons elbow upto his/her longest finger tip ? (A) Cubit
(B) Foot
(C) Fathom
(D) Finger span
A student has set up the circuit as shown below.
The bulb did not light up. What can he do to light up the bulb ? (A) Change the bulb. (B) Change the battery. (C) Change the position of the wire from Y to Z. (D) Change the position of the switch arm from Z to X. Which comparison is not true of sand paper and a mirror ? Sand paper
Mirror
(A)
It has a rough surface
It has a smooth surface
(B)
It reflects and scatters light
It reflects light
(C)
It can produce an image
It cannot produce an image
(D)
It undergoes irregular reflection
It undergoes regular reflection
Paper Code: UN412
11
C L A S S : VI
A ball was placed between the light source and the white screen and its shadow was formed on the screen. If a clear blue plastic sheet is placed in front of the light source, which of the following would be observed on the white screen ? (A)
(B)
(C)
(D)
Read the classification table shown below. Materials Conductors of electricity Insulators of electricity Non-metals Metals Non-metals Graphite Steel Mercury Water Nickel Rubber Brass Glass
Which material is grouped wrongly ? (A) Graphite (B) Brass
(C) Mercury
(D) Water
Electromagnets are not used in which of the given options? (A) Electric bells (C) Coins
(B) Electric motors (D) Electric trains
Identify an example of a motion of an object that moves in one position about its axis. (A) The swinging pendulum of a wall clock. (B) A stone whirled in a circle. (C) A potter shaping a pot. (D) A mosquito in flight. Paper Code: UN412
12
C L A S S : VI
Chemistry
Class : VI
The figures given below show the change in the level of water in a beaker after it has been left for a few hours in the sun. Original level of water
Water
Which process causes the lowering of the level of water ? (A) Condensation (B) Evaporation (C) Boiling
(D) Freezing
Four containers of different sizes and shapes contain 1 litre of sea water. Which container will produce salt first when they are placed under the sunlight ?
(A)
(B)
(C)
(D)
Identify the property of copper. (A) Conducts heat
(B) Floats on water
(C) Elastic
(D) Absorbs water
A solid substance X was placed in the sun for 2 hours. It melted and became a liquid. What could X be? (A) A plastic bucket (B) A metal spoon (C) A bar of chocolate
(D) A rubber band
Paper Code: UN412
13
C L A S S : VI
Identify the incorrect statement about water vapour. (A) It condenses into clouds as it is cooler at higher altitudes. (B) It forms less than 1% of air. (C) It can be compressed. (D) It is a liquid. Study the classification table given below. Group X
Group Y
Group Z
Paper
Key
Silk scarf
Rubber ball
Ceramic bowl
Leather bag
Wooden bench
Metal spoon
Woollen socks
A balloon can be placed in which of the given groups? (A) Y (B) X (C) Z (D) X and Y Which gas in the atmospheric air supports burning of substances ? (A) Nitrogen (B) Oxygen (C) Carbon dioxide (D) Sulphur dioxide A mixture which contains a liquid and a soluble solid may be separated by evaporation. What is the disadvantage of this method ? (A) (B) (C) (D)
It always requires heating. The liquid must have a high boiling point. The solute recovered may contain impurities. It cannot be used for a solid with a low melting point. Space for rough work
Paper Code: UN412
14
C L A S S : VI
Study the Venn diagram given below. X Y
Which of these could be X and Y ? (A) Rusting of iron and burning of camphor. (B) Melting of wax and making of ice. (C) Making paneer from milk and dissolution of sugar in water. (D) Making curd from milk and burning of wax. Object Z has the following properties.
It breaks when dropped. It sinks in water. It does not allow light to pass through. Which of the following is most likely to be object Z? (A) Pillow (B) Eraser (C) Spectacles
(D) Brick Space for rough work
Paper Code: UN412
15
C L A S S : VI
The two candles are similar. The candle in beaker X stops burning faster than the candle in beaker Y.
X
Y
Which statement below explains this? (A) Beaker X contains more water vapour than beaker Y. (B) Beaker X contains less nitrogen than beaker Y. (C) Beaker X contains less oxygen than beaker Y. (D) The air in beaker X is warmer than the air in beaker Y. Read the flow chart given below.
Man-made P
Natural Q
What does P represent? (A) Boiling
(B) Evaporation
(C) Condensation
(D) Freezing
Which property is most important in choosing a material to make a raincoat? (A) Waterproof
(B) Transparent
(C) Heat insulating
(D) Strong
Paper Code: UN412
16
C L A S S : VI
Which among the options is involved in filtration technique? (A) (B) (C) (D)
Hair in our nostrils Oil and air filters in cars Air filters in air conditioners All of the above
On which day will evaporation be the fastest ? Day
Morning
A ernoon
Night
(A) (B)
1 2
Sunny Cloudy
Cloudy Drizzle
(C)
3
Cloudy
30%
(D)
4
Sunny and windy Cloudy
Cloudy Thunder storm Sunny and windy Cloudy
Average humidity 40% 65%
Drizzle
55%
Identify the man-made materials. i. Ceramic
ii. Plas c
iii. Tin
iv. Wood
(A) Only (ii)
(B) Only (i) and (ii)
(C) Only (i), (ii) and (iii)
(D) Only (i), (ii) and (iv)
On adding alum powder to a beaker of muddy water, the unwanted particles settle down at the bottom of the beaker. What is the process involved in the above application ? (A) Evaporation
(B) Coagulation
(C) Sublimation
(D) Condensation Space for rough work
Paper Code: UN412
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C L A S S : VI
What is the correct sequence in the formation of rain ? (A) Water → vapour → cloud → rain (B) Water → cloud → vapour → rain (C) Vapour → cloud → rain (D) Vapour → water → cloud → rain Given below is a change that occurs in butter. Bu er Solid state
X Y
Bu er (Liquid state)
Identify X and Y that cause change in the state of butter. (A) X - Heat lost, Y - Heat gained (B) X - Heat gained, Y - Heat lost (C) X - Release of energy, Y - Absorption of energy (D) X - Decrease in temperature, Y - Increase in temperature The diagrams below show four different metal containers with a similar burning candle in each.
Which candle is the first to be extinguished ? (A) Candle III (B) Candle II (C) Candle I (D) Candle IV Space for rough work
Paper Code: UN412
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C L A S S : VI
Class : VI
Biology
The graph below shows the number of chloroplasts found in cells taken from different parts of a plant. Number of chloroplasts
Part X
Part Y
Part Z
Observe the given graph and identify part X. (A) root
(B) leaf
(C) fruit
(D) flower
Part of our balance diet which is neither body building nor energy providing but still important for proper functioning of our body is (A) protein. (B) carbohydrate. (C) vitamin.
(D) fat.
Which one of the following is a food producer? (A) Mushroom
(B) Algae
(C) Yeast
(D) Amoeba
The diagram shows three different types of animals.
Which of the following are correctly matched? (i)
Endoskeleton animal
P
(ii)
Exoskeleton animal
Q
Hydrosta c animal
R
(A) (i) and (ii) only
(B) (i) and (iii) only
(C) (ii) and (iii) only
(D) (i), (ii) and (iii)
Paper Code: UN412
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C L A S S : VI
Outermost whorl of flower which provide protection to reproductive parts is (A) Carpel. (B) Stamen. (C) Corolla.
(D) Calyx.
Which of the following is a response of plants to stimuli is true? (A) Roots grow towards water. (B) Shoots grow towards soil. (C) Roots grow towards sunlight. (D) Leaves bending towards soil. What type of joint is found at the circled part?
(A) Pivot
(B) Ball and socket (C) Hinge (D) Gliding
The cockroach has a flattened body shape. This characteristic helps them to
(A) survive for a long period without food. (B) Glide more quickly. (C) camouflage itself. (D) crawl between narrow crevices and spaces easily. Which part of flower give a platform to the pollens to germinate and proceed fertilization? (A) Anther
(B) Petal
(C) Stigma
(D) Stamen Paper Code: UN412
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C L A S S : VI
In an ecosystem there are living and non-living things. Which of these is an autotroph in an ecosystem? (A) Sunlight
(B) Air
(C) Greenplants
(D) Decomposers
Study the information below carefully.
Which of the following correctly identifies X and Y? (A)
X Frog
Y Tadpole
(B)
Tortoise
Dolphin
(C)
Dolphin
Whale
(D)
Some animals, such as polar bears, have a layer of fat under their skin. This adaptation helps them to (A) keep warm. (B) run fast. (C) protect from preying animals. (D) blend in with their surroundings. Which of the following correctly represents the path that water takes through a rose plant? (A) Leaf → food-carrying tubes in stem → root hairs → roots (B) Leaf → water-carrying tubes in stem → root hairs → roots (C) Roots hairs → roots → food-carrying tubes in stem → leaf (D) Root hairs → roots → water-carrying tubes in stem → leaf Paper Code: UN412
21
C L A S S : VI
The transport system in plants carries (A) sugar and oxygen. (B) water and carbon dioxide. (C) mineral salts and carbon dioxide. (D) sugar, water and mineral salts. You can see through a fat stain on brown paper. The table gives information about the stains left on brown paper by some foods.
Maplesyrup
No
Which foods contain fat? (A) Boiled potato and cashew nuts (B) Cashew nuts and full cream milk (C) Full cream milk and maple syrup (D) Boiled potato and maple syrup Camels can survive in the desert without food for days. Where do you think they store their food and fats? (A) Under their skin
(B) In their stomach
(C) In their intestines
(D) In their humps
Space for rough work
Paper Code: UN412
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C L A S S : VI
Which vegetable below contains carotene and a lot of vitamin A which is good for the eye?
(A)
(B)
(C)
(D)
The chart below shows the classification of organs that make up the various body systems of the human body. Body Systems
Circulatory
Diges ve
Respiratory
Heart Blood Blood vessels
Mouth Stomach Small intes ne Large intes ne Anus
Nose Windpipe Lungs Oesophagus
Which organ is classified wrongly? (A) Heart
(B) Oesophagus (C) Stomach (D) Windpipe
Plants tend to lose a lot of water in hot weather. Which of the following helps plants to save water? (A) Shedding leaves. (B) Having thick, fleshy leaves without stomata. (C) Having leaves with waxy surfaces. (D) All of these Which of the following organisms are decomposers? (A) Moulds and bacteria (B) Termites and millipedes (C) Woodlice and earthworms (D) Caterpillar and algae Paper Code: UN412
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C L A S S : VI
Class : VI
General Awareness
Which of these is called the Land of the Rising Sun? (A) Japan
(B) Australia (C) Rome
(D) Egypt
Identify the picture given below.
(A) Child Regulation Year (B) Child Rights & You (C) Child Rights Year (D) Child Resource & You Who is known as the Birdman of India? (A) Zakir Hussain (B) Salim Ali (C) JK Bajaj (D) Milka singh Which of these is the abode of Lord Jagannath? (A) Gopalpur (B) Konark (C) Puri (D) Kolkata Dhyan chand is associated with which sport? (A) Gymnasticks (B) Football (C) Hockey (D) Boxing India sent her first satellite into space in (A) 1960 (B) 1965 (C) 1970 (D) 1975 When is world Earth Day celebrated? (B) May 25th (A) April 22nd (C) June 18th (D) March 22nd The young one of a whale is (A) Cub (B) Calf (C) Eyas (D) Kid Who has written the autobiography My Experiments with truth? (A) Jawahar Lal Nehru (B) Mahatma Gandhi (C) Sardar Patel (D) Rajendra Prasad Of the following sportsmen, who has acted in films? (A) Pele (B) Maradona (C) Navratilova (D) Rivaldo Paper Code: UN412
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C L A S S : VI
Class : VI 1
The side of a square is half of a cm. Find the perimeter.
3
4
a m 8
a cm 4 Which of the following fractions is the largest ? 29 29 29 29 (A) (B) (C) (D) 30 23 25 27 What is a triangle with two acute angles and a right angle ? (A) A right angled triangle. (B) An acute angled triangle. (C) An equilateral triangle. (D) A scalene triangle. (A) 4a cm
2
Mathematics
(B)
(C) 2a cm
(D)
In numbers from 1 to 100, how many times does the digit 2 appear ? (A) 19 (B) 10 (C) 11 (D) 20 Space fo r rou gh w ork
Paper Code: UN 415
1
C L A S S : VI
5 6
3.5 + 4.05 6.005 = X. Find the value (A) 1.545 (B) 1.095 (C) 1.6 Which of the following products is an (A) even × odd × even (B) odd × (C) even × even × even (D) odd ×
of X. (D) 2.095 odd number ? odd × even odd × odd
7.
When the perimeter and area of a square are numerically equal, what is the numerical value of the measure of its side ? (A) 1 (B) 2 (C) 4 (D) 8
8.
The smallest 4-digit number formed by using the digits 5, 0, 3, 1 and 7 only once contains (A) 0 in thousands place. (B) 5 in tens place. (C) 3 in tens place. (D) 7 in units place.
9.
Simplify: 9 [ 8 + { 7 ( 6 5 4 )} ] 1 (A) 2 (B) 2 (C) 0 (D) 10 Space fo r rou gh w ork
Paper Code: UN 415
2
C L A S S : VI
10.
How many squares are there in the following figure ?
(A) 16 11.
(B) 17
(C) 25
The figure given below is a number line. 15
p
0
q
What is the value of p + q ? (A) 9 (B) 6 (C) 3 12. 13.
(D) 30
(D) 3
How many sq.cm make a sq.m ? (A) 100 (B) 1000 (C) 10000 (D) 10 A rope, !$ m long, was cut into three parts measuring ! " m, ! m and # m respectively. What was the # # length of the rope left ? 1 2 1 2 (A) 5 m (B) 7 m (C) 9 m (D) 11 m 6 5 6 5 Space fo r rou gh w ork
Paper Code: UN 415
3
C L A S S : VI
14.
Three bells toll together at intervals of 9, 12 and 15 minutes. If they start tolling together, after what time will they toll next ? (A) 1 hour
(B) 1
1 hours 2
1 hours (D) 3 hours 2 In the given figure, what are the magnitudes of the angles shown ?
(C) 2 15.
xo
3x o
(A) 40o, 120o (C) 45o, 135o 16.
(B) 50o, 130o (D) 60o, 120o
How does the value of a digit change as it moves from the right to the left in a place value chart ? (A) Decreases by 10 times. 1 (B) Decreases by times. 10 (C) Increases by 10 times. (D) Increases by
1 times. 10
Space fo r rou gh w ork
Paper Code: UN 415
4
C L A S S : VI
17.
Closure property is satisfied by whole numbers with respect to which of these operations ? (A) Addition and Subtraction (B) Addition and Division (C) Addition and Multiplication (D) Multiplication and Division
18.
What is the ascending order of 23, 12, 0, 6, 100, 1 ? (A) 1, 0, 12, 6, 23, 100 (B) 0, 1, 6, 12, 23, 100 (C) 100, 23, 6, 1, 0, 12 (D) 100, 23, 12, 6, 1, 0
19.
Which of the following statements is false ? (A) Two radii of a circle are equal. (B) AB is the same as BA . (C) )* is the same as *) . (D) *) is the same as )* .
20.
What is the H.C.F. of two co-prime numbers ? (A) 1 (B) 0 (C) 2 (D) 4 Space fo r rou gh w ork
Paper Code: UN 415
5
C L A S S : VI
21.
What is the sum of the shaded parts ?
+ 11 7 11 (C) (D) 18 18 7 Sameer cuts the paper shape shown in a straight line from point X to point Y. (A) 22.
10 9
(B)
4 cm
X
4 cm
Y
3 cm
What two shapes will Sameer have after he cuts the paper ? (A) A square and a triangle. (B) A square and a trapezium. (C) A rectangle and a triangle. (D) A rectangle and a parallelogram. Space fo r rou gh w ork
Paper Code: UN 415
6
C L A S S : VI
23.
Which of the following is the correct representation of the number of school teachers in Delhi ? Name of the City Hyderabad
Number of School Teachers
Delhi
2400
Chennai
3000
Name of the City Hyderabad
Number of School Teachers
4200
Chennai
(A) (B) (C) (D) Space fo r rou gh w ork
Paper Code: UN 415
7
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24.
A circle is inscribed in a square. If the radius of the circle is 4 cm, what is the perimeter of the square ?
(A) 28 cm (C) 32 cm 25.
(B) 24 cm (D) 36 cm
P and Q are whole numbers such that P = Q, then which of the following is true ? (A) P + Q = Q (B) P + Q = P (C) P + Q = Q + P ÷ 0 (D) P Q = Q P Space fo r rou gh w ork
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Class : VI
Physics
26.
Which property of copper is used for making electrical wires ? (A) Elastic (B) Conductive (C) Malleable (D) Shiny
27.
We cannot see an object when (i) it reflects light. (ii) it casts a shadow. (iii) there is no light.
28.
29.
30.
(A) Only (i) (C) Only (iii)
(B) Only (ii) (D) All the three
Ten metres is equal to (A) 100 cm
(B) 1,00,000 mm
(C) 1,000 cm
(D) 1,000 µm
Which of the figures given below shows the correct direction of magnetic force ? (A)
S
S
N
(B)
S
N
S
(C)
N
S
S
(D)
N
N
N
Pure water is a non-conductor of electricity but can be made conducting by adding to it (A) sugar. (B) drops of oil. (C) salt. (D) pieces of wood. Paper Code: UN 415
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31.
Air (A) (B) (C) (D)
is not visible because it is nearly a perfectly transparent substance neither absorbs nor reflects light transmits whole light all the above are correct
32.
Identify the motion of the block shown in the figure.
(A) Oscillatory motion (C) Curvilinear motion 33.
(B) Translatory motion (D) Periodic motion
The diagram below shows five different bulbs connected in a series circuit with two dry cells. I
II
IV
III
V
How many bulbs will light up ? (A) 3 (B) 4 (C) 5 (D) All the bulbs 34.
Where is the magnetism maximum in case of horse-shoe magnet ? (A) In both the poles (B) In south pole (C) In north pole (D) In between the two poles Paper Code: UN 415
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35.
Which one is odd man out ? (A) A car taking turn on a curved road (B) Motion of a swing (C) Motion of needle end of a sewing machine (D) Motion of an engine piston
36.
In an electric torch, electric energy is converted into (A) light energy. (B) heat energy. (C) sound energy. (D) both light and heat energy.
37.
Four students P, Q, R and S commented on a rod magnet that was cut into two pieces.
P : The rod magnet would become stronger. Q : Each piece would become a magnet. R : The rod magnet would lose its magnetism totally. S : One piece would have stronger magnetism than the other.
38.
39.
Whose statement is true ? (A) S (B) Q (C) R (D) P Shadows are (A) virtual. (B) real. (C) illusion. (D) permanent. A test tube measures 125 mm in length. Which of the following is also a correct length for this test tube ? (A) 0.125 m (B) 1.25 cm (C) 1.25 m (D) 12.5 m Paper Code: UN 415
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40.
Which material can be used to make the needle of a compass ? (A) Aluminium (B) Gold (C) Cobalt (D) Copper
41.
There is no dark shadow formed by the glass when light is shone on it in the given figure.
Light
Glass
This is because (A) it is not night time yet. (B) the light is not strong enough. (C) the glass is a transparent object. (D) the glass is an opaque object. 42.
Given below is a list of materials that can be chosen to replace material X to light up the bulb, EXCEPT
Material X
(A) cotton. (C) salt water.
(B) iron. (D) mercury. Paper Code: UN 415
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43.
The magnetic strength of a magnet (A) is concentrated at one point in the centre of the magnet. (B) is concentrated at one point at the end of the magnet. (C) is concentrated at two points near the ends of the magnet. (D) is spread uniformly throughout the magnet.
44.
Which figure represents the translucent medium ?
I
II
(A) I only (C) I and III only
III
(B) II only (D) III only
45.
The hands of a clock and the spokes of a wheel are in (A) rotatory motion. (B) revolutionary motion. (C) oscillatory motion. (D) translatory motion.
46.
The filament of a bulb is a/an (A) conductor. (B) insulator. (C) semi-conductor. (D) both (A) and (B)
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47.
Four iron nails were fixed onto a bar magnet as shown below. The set-up was lowered into a container of thumbtacks.
S
P
Q
R
S
Which iron nail(s) would be able to attract the most thumbtacks ? (A) P only (B) P and Q only (C) R and S only (D) P and S only 48.
The path along which light travels in a homogeneous medium is called the (A) beam of light. (B) ray of light. (C) pencil of light. (D) none of these.
49.
Which of the following does NOT affect the brightness of a bulb in a circuit ? (A) The number of batteries in the circuit. (B) The arrangement of the batteries in the circuit. (C) The number of bulbs in the circuit. (D) The length of the wire in the circuit.
50.
Motion of a screw while going into the wood is an example of (A) linear and spin motion. (B) rotation and revolution. (C) rotation and spin motion. (D) rotation and linear motion. Paper Code: UN 415
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Chemistry
Class : VI 51.
52.
53.
An example of change of state is (A) melting. (B) rusting. (C) evaporation. (D) both (A) and (C) A mixture of tea leaves and iron filings can be separated by (A) filtration. (B) hand picking. (C) magnet. (D) sieving. Using the following statements deduce the hardness of the following four materials.
Tungsten carbide will drill through steel and glass. Wood can be scratched by glass. Both steel and tungsten carbide will scratch glass.
Which is the correct order of increasing hardness for the four materials ? (A) Wood, steel, glass, tungsten carbide (B) Wood, glass, steel, tungsten carbide (C) Wood, tungsten carbide, glass, steel (D) Wood, tungsten carbide, steel, glass 54.
A family of six used 42 000 l of water in 2 weeks. How much water did each member use in 1 week on an average ? (A) 7000 l/week (B) 3500 l/week (C) 21 000 l/week (D) 21 l/week Space fo r rou gh w ork
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55.
Which of the following is NOT a physical change ? (A) Wet clothes under the sun become dry. (B) Wood burns to form ash. (C) A potato is cut into smaller pieces. (D) Chocolate melts on a hot day.
56.
A ball sinks in oil. What does this tell us ? (A) The ball is a very big object. (B) The ball has a very big mass. (C) The gravity is very strong. (D) The ball is denser than oil.
57.
An empty bottle with a balloon fixed to its mouth is placed in a trough of hot water. What do you think will happen in this experiment ? (A) Water will be seen inside the bottle. (B) The balloon will expand. (C) Steam starts to exist inside the bottle. (D) All the answers are correct.
58.
What does hail consist of ? (A) Granular ice (B) Crystals of ice (C) Water droplets (D) Masses of ice in layers one above the other.
59.
A material is not flexible, hard and does not change easily. Which item below is best made with this material ? (A) Balloon (B) Key (C) Clothes (D) Sofa What is the easiest way to separate a mixture of two solids with different sizes ? (A) Evaporation (B) Filtration (C) Sieving (D) Sedimentation
60.
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61.
Which key shows the material with three of its properties correctly listed ? Malleability Non-malleable Non-conductor
Malleable Non-malleable
Conductor
62.
63.
64.
65.
Malleable
When a little bit of curd is added to milk and it is left undisturbed for sometime, the milk changes into curd. It is an example of (A) Fast chemical change (B) Fast physical change (C) Slow chemical change (D) Slow physical change Muddy water often involves the process of separating insoluble solid particles from the water. Which separation technique helps to remove solid particles from the water ? (A) Filtration (B) Sedimentation (C) Distillation (D) Both (A) and (B) Water is a compound because (A) it exists as a solid, a liquid or a gas. (B) it contains hydrogen and oxygen. (C) it contains two different elements joined by chemical bonds. (D) it cannot be split up into simpler substances by chemical means. Which material cannot be found in nature ? (A) Metal (B) Rock (C) Wood (D) Plastic Paper Code: UN 415
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66.
67.
68.
69.
70.
The gas replaced or renewed by plants in photosynthesis is (A) argon. (B) nitrogen. (C) carbon dioxide. (D) oxygen. Photosynthesis is (A) an exothermic process. (B) an endothermic process. (C) a physical process. (D) a thermostatic process. Stones and other undesirable substances are separated from food grains by (A) handpicking. (B) filtration. (C) winnowing. (D) magnetic separation. A frying pan is usually made of stainless steel, iron or aluminium because it must (A) be strong and not break. (B) conduct heat easily. (C) not burn. (D) not react with the food being cooked. In the liquid form, water exists in (A) ponds, lakes, atmosphere and rivers. (B) dams, rivers, ponds and glaciers. (C) seas, oceans, glaciers and hills. (D) rivers, lakes, seas and oceans. Space fo r rou gh w ork
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Class : VI 71.
Biology
Which labelled arrow represents the movement of oxygen in the given figure ? (A) P P Q (B) Q R (C) R SU
(D) S
N
S
72.
What is the function of the tendrils of the cucumber plant ? (A) It holds the plant firmly to the ground. (B) It helps the plant to climb up a support. (C) It stores nutrients for the plant. (D) It helps the plant to carry out photosynthesis.
73.
Which of the following options comprises various stages in the life of an organism in proper sequence ? (A) Birth, reproduction, growth, death. (B) Growth, reproduction, birth, death. (C) Birth, reproduction, death, growth. (D) Birth, growth, reproduction, death.
74.
Which of the following joints work as in the figure given below ? (A) Ankle and knee joints (B) Hip and shoulder joints. (C) Neck and wrist joints. (D) Shoulder and knee joints.
75.
Which of these includes culturing of earthworms and redworms ? (A) Pediculture (B) Vermicomposting (C) Sericulture (D) Pisciculture Paper Code: UN 415
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76.
Given below are two groups of materials used to make clothing.
Cotton Jute Flax On (A) (B) (C) (D) 77.
Fur Leather Silk
what basis these have been grouped ? Air space inside fibres. Air space between fibres. Water absorption. The basis of their sources.
The food items given below belongs to which of the following groups ?
Beans, Peas, Pulses, Meat (A) Fats (C) Vitamins
(B) Proteins (D) Carbohydrates
78.
Some things were buried in wet ground. Several years later they were dug up. Which thing is most likely to have stayed the same ? (A) A newspaper (B) A paper cup (C) A potato peel (D) A plastic glass
79.
Birds like hen, duck and turkey are categorised under which of the following groups ? (A) Apiculture (B) Poultry birds (C) Vermiculture (D) Sericulture
80.
Which of the following food substance deficiency leads to rickets ? (A) Vitamin D (B) Vitamin A (C) Vitamin C (D) All of these Paper Code: UN 415
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81.
Which of the following does not belong to the group formed by the others ? (A) Tomato (B) Pumpkin (C) Chilly (D) Turnip
82.
Observe some of these items given below.
P Q R S Which of these items cannot be recycled? (A) P (B) Q (C) R (D) S 83.
What does the figure given below represent ? Sun
C arbon dioxide B oy
Tre e C ow Grass Food a nd ox ygen
(A) (B) (C) (D) 84.
Interdependence Interdependence Interdependence Interdependence
between between between between
plants. plants and animals. animals. abiotic factors.
Which joint is present at the knee and arm ? (A) Ball and socket joint. (B) Pivot joint (C) Hinge joint (D) Fixed joint Paper Code: UN 415
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85.
Which of the following should come in the empty box given below ? Water from roots
86. 87.
88.
Water in the leaves
(A) Flowers (B) Stem (C) Fruits (D) Bark Which fibre on burning smells like burning hair ? (A) Cotton (B) Flax (C) Wool (D) Jute How is roughage important to humans ? (A) Prevents constipation (B) Builds and repairs tissues (C) Maintains the health of the body (D) Produces haemoglobin in red blood cells Which of the following groups of animal can X be ?
Plant (A) Autotroph (C) Herbivore 89.
?
X
Lion (B) Carnivore (D) Producer
Read the information about a substance P given below.
P Can be recycled Bio-degradable Non-toxic and useful Which of the following substance is P ? (A) Paper (B) Glass bottle (C) Metal can (D) Plastic bottle 90.
Which of these plants are light spongy and have numerous air spaces in their stems ? (A) Mesophytes (B) Xerophytes (C) Bryophytes (D) Hydrophytes Paper Code: UN 415
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Class : VI
General Awareness
91.
Sardar Vallabhbhai Patel giant statue, a big initiative of P.M. Narendra Modi is to be called as? (A) Statue of Liberty (B) Statue of Equality (C) Statue of Freedom (D) Statue of Unity
92.
What is a pistachio ? (A) A beetle (C) A pistol
(B) A belt (D) A nut
93.
Who wrote the classic novel Oliver Twist ? (A) William Thackeray (B) Lewis Carroll (C) Bram Stoker (D) Charles Dickens
94.
In which Brothers Grimm tale does a talking mirror anger a wicked queen ? (A) Rapunzel (B) Alice in Wonderland (C) Snow White (D) Hansel and Gretel
95.
The given logo belongs to which company ? (A) Nike (C) Ranbaxy
(B) Bajaj (D) Reebok
96.
The moon Titan belongs to which planet ? (A) Saturn (B) Neptune (C) Uranus (D) Jupiter
97.
What does the acronym CEO stand for ? (A) Central Executive Officer (B) Chief Executive Officer (C) Central Exchange Officer (D) Chief Extensive Officer
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98.
Who painted the portrait of Mona Lisa ? (A) John Appelseed (B) Leonardo Da Vinci (C) Marconi (D) Grahambell
99.
Which country has the flag shape shown below ?
(A) Japan (C) Korea 100.
(B) China (D) Nepal
Name the festival of Indian Culture inaugurated by President Pranab Mukherjee in Moscow. (A) United Russia (B) Namaste Russia (C) Khushaal Russia (D) Lovely Russia Space fo r rou gh w ork
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Class : VI
Mathematics
1.
What do literals usually represent ? (A) Known quantities (B) Variables (C) Constants (D) Depends on the problem
2.
What is the least value that should be given to * so that the number 653*47 is divisible by 11 ? (A) 9 (B) 6 (C) 2 (D) 1
3.
A rectangular box is of length l units and width b units. The length of another box is twice the length of the first box and its width is half the width of the first box. How are their areas related ? (A) The area of first box is twice the area of the second box. (B) The area of second box is twice the area of the first box. (C) The areas of both the boxes are equal. (D) The area of first box is tripled. Space for rough w ork
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4.
Given A = 728 and B = 0, what is the difference of B and A ? (A) 1456 (B) 728 (C) 728 (D) 0
9.
If the value of Q is twice the value of R, find the value of P.
56 (A) 2 6.
÷P (B) 28
÷Q (C) 1
R (D) 56
# lie ? " (B) 2 and 3 (D) 11 and 12
Between which numbers does (A) 1 and 2 (C) 3 and 4
7.
Q
How many edges does the following figure have ?
(A) 12
(B) 8
(C) 6
(D) 4
Space for rough w ork
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8.
A number is always divisible by 90 if (A) it is divisible by both 2 and 45. (B) it is divisible by both 5 and 18. (C) it is divisible by both 9 and 10. (D) All the above.
9.
In which figure does the shaded part represent 0.3 ?
(A)
(B)
(C)
(D)
10.
What is the number of end points of a line ? (A) Zero (B) Two (C) One (D) Three
11.
Two rectangular plots of length 40 m and width 20 m are as shown.
20 cm 40 cm
What is the cost of fencing the plots at 16000 (B) 1600 (A) (C) 640 (D) 6400
4 per metre ?
Space for rough w ork
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12.
Under which period is ten lakhs ? (A) Crores (B) Lakhs (C) Thousands (D) Millions
13.
How many more equal sized pieces would you need to make a half of the given figure ?
(A) 1
(B) 2
(C) 4
(D) 6
14.
An isosceles triangle has a measure of 'p' units for its equal sides and 'q' units for its unequal side. What is its perimeter ? (A) 2(p + q) units (B) 2p + q units (C) 2q + p units (D) 2(q × p) units
15.
What do you get when you multiply two factors ? (A) Sum (B) Product (C) Difference (D) Quotient Space for rough w ork
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16.
The evening temperature of Shimla fell down to 6 °C in the mid-night and to 1 °C at 6 a.m. By how many degrees did the temperature rise ? (A) 4 °C (B) 4 °C (C) 5 °C (D) 5 °C
17.
Which of the following statement(s) is/are true ? (A) A parallelogram in which two adjacent angles are equal is a rectangle. (B) A quadrilateral in which both pairs of opposite angles are equal is a parallelogram. (C) In a parallelogram the number of acute angles is two. (D) All the above.
18.
Find the perimeter of the triangle given. 50 cm
40 cm 0.6 m
(A) 150 cm (C) 690 cm
(B) 90.6 cm (D) 96 cm Space for rough w ork
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19.
If 'a' and 'b' are two whole numbers, then under what condition is the commutative law applicable to subtraction ? (A) a = b (B) a ≠ b (C) a > b (D) a < b
20.
Ayan completed
21.
Which of the following lines is perpendicular to the line AB ?
! of his assessment on Monday and # " of the assessment on Tuesday. How much of his assessment did Ayan complete on the two days ? 4 3 19 (A) 1 (B) (C) (D) 9 20 20
) 8
1
111 11 *
(A) IV 22.
(B) III
18
(C) II
(D) I
Which of the following are the two numbers formed by subtracting I in Roman numerals ? (A) 11 and 12 (B) 4 and 10 (C) 4 and 9 (D) 5 and 6 Space for rough w ork
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23.
The line plot below shows how students scored on last week's maths test. Maths Test Scores
70
75 80 85 90 95 100 Marks
Key: Each = 1 student How many students scored 95 or higher on the test ? (A) 5 (B) 7 (C) 12 (D) 16 24.
The sum of two numbers is 31.021. If one of them is 11.56, what is the other number ? (A) 19.461 (B) 17.461 (C) 18.641 (D) 19.561
25.
Simplify the expression below.
(A) 11
3 + 7 (5 + 1)
3–2
(B) 13
(C) 15
(D) 18
Space for rough w ork
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Class : VI 26.
Physics
Identify the correct grouping of different materials according to their electrical conductivity. Electrical Insulators
Electrical Conductors
(A)
Plastic, wood
Mercury, tungsten
(B)
Carbon, steel
Iron, paper
(C)
Copper, gold
Nickel, clay
(D)
Iron, rubber
Silver, plastic
27.
The object that does not form a shadow is the (A) lens of a magnifying glass. (B) glass of a mosaic window. (C) lens of a sunglass. (D) both (A) and (C)
28.
Which type of motion is NOT exhibited by a rotating fan ? (A) Circular (B) Rotatory (C) Periodic (D) Rectilinear
29.
A magnet cannot be demagnetized by (A) heating it. (B) cooling it. (C) hitting it with a hammer many times. (D) dropping it from a height many times.
30.
An example of a non-conducting material is (A) bakelite. (B) copper. (C) aluminium. (D) brass.
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31.
At what time will the shadow cast by a pole under the sun be the shortest ? (A) 8.30 a.m. (B) 10.00 a.m. (C) 12 noon (D) 5.00 p.m.
32.
The prefix Kilo means (A) 10000 (C) 1/1000
33.
(B) 1000 (D) 1/100
The bulbs (L, M and N) used in the circuit shown below are all identical. Bulb L Bulb M
Bulb N
Which of the following statements is true ? (A) All three bulbs are of the same brightness. (B) Bulb L is brighter than Bulb M or Bulb N. (C) Bulb L and Bulb M are brighter than Bulb N. (D) Bulb N is brighter than Bulb L or Bulb M. 34.
The two poles of a horse shoe magnet are (A) east and west poles. (B) north and south poles. (C) north-east and south-east poles. (D) north-west and south-west poles.
35.
The thickness of a dozen coins on a metre scale was found to be 18 cm. What is the thickness of one coin ? (A) 15 cm (B) 1.2 cm (C) 1.8 mm (D) 15 mm
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36.
Identify the energy conversions in a calculator with solar cells. (A) Light energy → chemical energy → light energy (B) Heat energy → chemical energy → light energy (C) Heat energy → electrical energy → light energy (D) Light energy → electrical energy → light energy
37.
What are needed to make an electromagnet ? (A) An iron nail, a battery and copper wire. (B) A copper nail, a battery and a light bulb. (C) A silver nail, a battery and a light bulb. (D) A brass nail, a light bulb and copper wire.
38.
Rectilinear propagation of light is defined as (A) straight path of light. (B) curved path of light. (C) zig-zag path of light. (D) both (B) and (C)
39.
Which of the following show movements without changing their place ? (i) The hands of a clock (ii) The opening and closing of flowers (iii) A flying bird
(A) Only (i) and (ii) (C) Only (i) and (iii)
(B) Only (ii) and (iii) (D) All the three
Space for rough w ork
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40.
Three bars of magnets attract each other as shown below. II
III
IV
I VI
V
Which two points will repel each other ? (A) II and IV (B) III and VI (C) II and V (D) II and III 41.
When the Sun is behind you, your shadow is (A) behind you. (B) above you (C) in front of you. (D) both (A) and (B)
42.
Identify the circuit diagram in which the bulb does NOT light up.
P
(A) Only P and Q (C) Only R and P 43.
Q
R
(B) Only Q and R (D) P, Q and R
We have to apply some force while opening the door of the refrigerator due to the presence of (A) electrons in the refrigerator. (B) a magnet inside the door. (C) electric current in the door. (D) all of the above.
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44.
The shape of the shadow depends upon the (A) size of the object. (B) position. (C) size of source of light. (D) shape of the object.
45.
The choice of a length-measuring device depends on the type of (A) measurement. (B) device. (C) surface. (D) metric system. One of the ways to prevent us from getting electric shock is by wearing rubber shoes. What is the reason ? (A) Rubber is a very good insulator. (B) Shoes are placed at the lowest part of our body. (C) All metals conduct electricity except shoes. (D) Copper conducts electricity better than rubber.
46.
47.
The diagram below shows a magnet attracting three steel pins while another magnet is approaching slowly from the left.
N S What will happen to the string of attracted pins ? (A) Repel to the right (B) Attract to the left (C) Fall off from the magnet (D) Remain stationary Paper Code: UN 418
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48.
49.
Sun, star, electric bulb, earthen lamps are objects that are (A) luminous. (B) non-luminous. (C) opaque. (D) translucent. Which part of the bulb is an insulator ? P Q R S
50.
(A) Q (B) S (C) R (D) P Which of these is the longest ? (B) Mile (A) Kilometre (C) Yard (D) Metre Space for rough w ork
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Chemistry
Class : VI 51.
A change among substances involves (A) an action. (B) a reaction. (C) an interaction. (D) both (A) and (B)
52.
What kind of mixtures are alloys ? (A) Solid-Gas (B) Liquid-Liquid (C) Gas-Gas (D) Solid-Solid
53.
Three beakers contain equal amounts of water and another material. Which list shows the solubility of the different materials in the beakers, from most to least soluble ? (A) Salt, sand, plastic (B) Salt, oil, sand (C) Sand, glycerine, wax (D) Alcohol, salt, sand
54.
Which statement is true about the water cycle ? (A) It occurs only in the day. (B) It occurs only in the night. (C) It is important to animals only. (D) It ensures a continuous supply of fresh water.
55.
In which of the following cases the heat energy is given out ?
(i) (ii) (iii) (iv)
When water boils When ice melts When water freezes to ice When water vapour condenses to water
(A) In (i), (ii) and (iii) (C) In (iv) only
(B) In (iii) only (D) In both (iii) and (iv)
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56.
When no more salt can be dissolved in water at a particular temperature, then the solution at that temperature is called (A) unsaturated. (B) saturated. (C) sometimes saturated sometimes unsaturated. (D) none of the above.
57.
The temperature of the air varies (A) periodically. (B) vertically. (C) horizontally. (D) all are correct
58.
Which of these processes involve condensation of water ? (A) Spectacles become misty after coming out of a cold place. (B) White clouds are seen when water is boiled. (C) Steam coming out from boiled water. (D) Both (A) and (B)
59.
Rod X, though placed in boiling water, does not become hot. Rod Y, lying on the table, becomes cool when touched. What materials are they most likely to be made of ? (A) Rod X is metal and rod Y is plastic. (B) Rod X is glass and rod Y is ceramic. (C) Rod X is glass and rod Y is plastic. (D) Rod X is glass and rod Y is metal.
60.
Air is a/an (A) compound. (C) mixture.
(B) element. (D) electrolyte.
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C L A S S : VI
61.
1 kg of iron occupies less space compared to 1 kg of sponge. Why ? (A) Iron has less density than sponge. (B) Iron and sponge have equal densities. (C) Iron has more density than sponge. (D) Weight of iron per unit volume is less than that of sponge.
62.
Which of the following is a periodic change ? (A) Stoppage of electric supply (B) Occurrence of low and high tides (C) Falling of ripened fruits from a tree (D) Sneezing
63.
Decantation can be used to separate (A) sugar from sugar solution (solid dissoves in the liquid). (B) two miscible liquids, i.e., which mix with each other, like alcohol and water. (C) two immiscible liquids, i.e., liquids which do not mix together like oil and water. (D) solid-solid mixture. Space for rough w ork
Paper Code: UN 418
16
C L A S S : VI
64.
65.
66.
67.
The amount of water given in each container are the same, water inside which container would evaporate the quickest ?
(A)
(B)
(C)
(D)
Which of the given combinations is the odd one out ? (A) Ink and water (B) Milk and water (C) Oil and water (D) Lime juice and water The most prominent gases in the atmosphere in terms of volume are (A) nitrogen and methane. (B) nitrogen and oxygen. (C) hydrogen and nitrogen. (D) oxygen and carbon dioxide. What kind of change is the making of a ring from pure gold ? (A) An irreversible, chemical change (B) An irreversible, physical change (C) A reversible, chemical change (D) A reversible, physical change
Paper Code: UN 418
17
C L A S S : VI
68.
69.
70.
Which process is used for separating a mixture of water and sulphur ? (A) Filtration (B) Winnowing (C) Evaporation (D) Distillation Light passes through a piece of paper partially as it is (B) translucent. (A) transparent. (C) opaque. (D) all the three Sugar will dissolve most easily in which beaker ?
(A)
(B) Water at 0 C
(C)
Water at 30 C
(D) Water at 15 C
Water at 60 C
Space for rough w ork
Paper Code: UN 418
18
C L A S S : VI
Class : VI 71.
Biology
The plant in the given figure responds to
(A) touch. (C) gravity. 72.
(B) sunlight. (D) water.
Identify P and Q in the given chart.
Joints Q
P Elbow joint Knee joint
Shoulder joint Hip joint
P
73.
Q
(A)
Gliding joint
Pivot joint
(B)
Hinge joint
Ball and socket joint
(C)
Pivot joint
Hinge joint
(D)
Hinge joint
Gliding joint
Identify X in the given classification.
Terrestrial ecosystem Forest (A) Ocean (C) Grassland
X
Desert (B) River (D) Pond
Paper Code: UN 418
19
C L A S S : VI
74.
Which of these plants would have a root structure similar to one shown in the figure given below ?
(A) Marigold (C) Paddy
(B) Mango (D) Balsam
75.
Which characteristic feature is common to gourd, pea and grapevine ? (A) They are shrubs. (B) They are trees. (C) They are climbers. (D) They are herbs.
76.
Which class of food is present in pulses ? (B) Fats (A) Vitamins (C) Carbohydrates (D) Proteins
77.
The animals given below are similar as they all are
(A) herbivores. (C) insectivores. 78.
(B) carnivores. (D) omnivores.
Which of these articles cannot be recycled and used again ? (A) Newspaper (B) Banana peel (C) Raincoat (D) Plastic bags Paper Code: UN 418
20
C L A S S : VI
79.
80.
81.
The given figure illustrates a plant structure. Which labelled part of the plant is not alive ?
(A) P (B) Q (C) R (D) S Which vitamin deficiency leads to bleeding of gums, slow healing of wounds and aching limbs ? (A) Vitamin A (B) Vitamin B (C) Vitamin C (D) Vitamin D Which of the following is/are the results of waste management ?
(i) Reduc on of air, water and land pollu on. (ii) Conserva on of natural resources. (iii) Increase of air, water and land pollu on. (A) (i) and (ii) only (C) (ii) and (iii) only
(B) (i) and (iii) only (D) (i), (ii) and (iii)
82.
An organism X has hair on its body. It gives birth to youngone that feed on their mothers milk. Which organism is X ? (A) Rabbit (B) Tortoise (C) Lizard (D) Crocodile
83.
Which joint is located at neck ? (A) Pivot joint (B) Fixed joint (C) Ball and socket joint (D) Hinge joint Paper Code: UN 418
21
C L A S S : VI
84.
Complete the given correlation
Silk : Cocoon, Wool : ? (A) Hair of rabbit (C) Fleece of sheep.
(B) Cotton plant. (D) Jute of hemp.
85.
Which part of a cotton plant is used to obtain fibres ? (A) Stem (B) Bolls or fruit (C) Branches and leaves (D) Roots
86.
Which group consists of a herbivore, a carnivore and an omnivore respectively ? (A) Giraffe, house lizard and rat. (B) Toadstool, goat, and eagle. (C) Mould, bear and snake. (D) Giraffe, rat and caterpillar.
87.
Which of the following is an edible root ? (A) Potato (B) Pine apple (C) Radish (D) Cabbage
88.
Which of these is an animal product ? (A) Tea (B) Coffee (C) Butter (D) Cocoa
89.
A material X is biodegradable, can be recycled and is non toxic and very useful. What is X ? (A) Glass bottle (B) Plastic bottle (C) Metal can (D) Paper
90.
Which part of the fish helps it to move ? (A) Hands and fins (B) Legs and fins (C) Gills and fins (D) Fins and tail
Paper Code: UN 418
22
C L A S S : VI
Class : VI
General Awareness
91.
Which countrys national sport is cricket ? (A) India (B) England (C) China (D) Australia
92.
The boundary line between which two countries is called Radcliffe line ? (A) India and China (B) India and Pakistan (C) India and Myanmar (D) India and Afghanistan
93.
Which of the following is the capital of China ? (B) Saint Petersburg (A) Beijing (C) California (D) Rio de Janeiro
94.
The given logo belongs to which company ?
(A) Honda (C) Hyundai
(B) Hitachi (D) Maruti Suzuki
95.
What is the name of the little squirrel in Ice Age series, that's obsessed with acorns? (A) Scat (B) Cret (C) Scrap (D) Scrat
96.
Who is the author of The Adventures of Tom Sawyer ? (B) Robert Stevenson (A) Charles Dickens (C) Mark Twain (D) Jonathan Swift
97.
Which of the following has the slogan Eat fresh ? (B) Pizza hut (A) Dominos (C) KFC (D) Subway Paper Code: UN 418
23
C L A S S : VI
98.
What is the classical dance form of Tamilnadu ? (A) Bharata Natyam (B) Kuchipudi (C) Kathakali (D) Kathak
99.
Which of the following dish is made from Curd (Dahi) ? (A) Kofta (B) Raita (C) Kheeer (D) Kulfi
100.
What does the acronym WHO stand for ? (A) World Humans Organization (B) World Health Organization (C) Worlds Health Objective (D) Women Health Organization Space for rough w ork
Paper Code: UN 418
24
CLASS :6
Class : 6 1.
Mathematics
If
+ +
+ +
+ +
=
What are the respective values of (A) 2 & 4 (C) 4 & 2 2.
3.
×
= ×
and ×
and
. ?
(B) 6 & 4 (D) 8 & 6
Which of the following is the greatest negative integer ? (A) 100 (B) Does not exist. (C) 1 (D) 9 5 2 4 + − = M. Determine the value of M. 6 3 9 (A) (B) (C) (D) 3 $ ' & Space fo r rou gh w ork
Paper Code: UN421
1
CLASS :6
4.
What is the difference between the successor of the least 5-digit number and the predecessor of the greatest 3-digit number ? (A) !009 (B) 900! (C) 90!! (D) 90!0
5.
Which of the following numbers is a perfect number ? (A) 6 (B) 28 (C) Both (A) & (B) (D) !4
6.
Which is the largest decimal that can be formed using 1, 3, 4 and 6 ? (A) 6.4!1 (B) 64.!1 (C) 64!.1 (D) 641.!
7.
How many line segments are possible with three non collinear points ? (A) 1 (B) 2 (C) ! (D) Infinitely many Space fo r rou gh w ork
Paper Code: UN421
2
CLASS :6
8.
At 5: 20 what type of angle is formed between the two hands of a clock ? (A) An obtuse angle (B) A right angle (C) An acute angle (D) A straight angle
9.
The answers of four students A, B, C and D for prime factorisation of 24 are given. Whose answer is wrong ? (A) 2 × 2 × 2 × ! (B) 8 × ! (D) 2 × ! × 2 × 2 (C) ! × 2 × 2 × 2
10.
If the length and breadth of a rectangle are doubled, how does its perimeter change ? (A) Tripled (B) Doubled (C) Halved (D) Becomes 4 times.
11.
Which of the following symbols in order must be introduced in the blanks to make the given sentence true ? 43 _____ 1 = 47_____ 3
(A) +, ×
(B) , +
(C) × , +
(D) +,
Space fo r rou gh w ork
Paper Code: UN421
3
CLASS :6
12.
Two different diameters of the same circle cannot (A) be perpendicular. (B) be equal in length. (C) be parallel. (D) have a point in common.
13.
Which of the following statements is false ? (A) Using a protractor, an angle of any measure between 0° and 180° can be drawn. (B) A line has two end points. (C) An angle whose measure is greater than 90° is an obtuse angle. (D) Two coinciding rays with a common end point form an angle of measure 0°. Find the difference when 28 is subtracted from 12. (A) 16 (B) +16 (C) +40 (D) 40
14.
15.
What is the product of all the even numbers that are both greater than 10 and less than + 10 ? (B) !842 (A) !84002 (C) !84 (D) 0 Space fo r rou gh w ork
Paper Code: UN421
4
CLASS :6
16.
Which decimal number is the same as (A) 0.!4
(B) 0.51
(C) 0.75
! ? " (D) !.4
17.
If N is the number of primes less than #0, then _______ is the number of primes less than $0. (A) N + 1 (B) N + 2 (C) N + ! (D) N + 4
18.
Which of the following is a possible triangle ? (A) An obtuse angled equilateral triangle. (B) An obtuse angled right triangle. (C) An obtuse angled isosceles triangle. (D) A right angled equilateral triangle.
1'.
Three points P, Q and R are said to be collinear. Where do they lie ? (A) On the same plane. (B) On the same line. (C) On different lines. (D) On different planes. Space fo r rou gh w ork
Paper Code: UN421
5
CLASS :6
20.
Which of the following statements is NOT true ? (A) There are 100 whole numbers between 0 and 100. (B) The product of a number and 1 is the number itself. (C) The sum of a number and 0 is the number itself. (D) The product of 1 and 0 is 0.
21.
The given pictograph shows the number of pupils in 4 different classes. 18 111 11 1
Key: Each
represents # pupils.
What is the total number of pupils in all the 4 classes ? (A) 80 (B) 95 (C) 100 (D) 105 Space fo r rou gh w ork
Paper Code: UN421
6
CLASS :6
22.
Ravi wrote two digits of a 3-digit number on the blackboard as shown below.
?
Find the missing digit if 11 is its factor. (A) 2 (B) 4 (C) 6 (D) 8 23.
The reciprocal of 4 equals the average of the reciprocals of 3 and _______. (A) 5
(B) 6
(C)
#
(D)
$
24.
For which digit are the place value and face value always equal ? (A) 0 (B) 1 (C) Any digit (D) 10
2#.
Choose the set that has the solution for the equation n + 8 = 20. (A) (12, 8, 20, 0) (B) (2, 0, 2, 4) (C) (7, 2, 10, 14) (D) (4, 4, 2, 0) Space fo r rou gh w ork
Paper Code: UN421
7
CLASS :6
Class : 6 2$.
Physics
Study the electric circuit shown below. K N
Bulb A M
L
Bulb B
Which switches need to be closed so that only Bulb A will light up ? (A) K, L and N (B) K, M and N (C) L and N (D) K and N 27.
Which of the given sources emit light naturally ?
(A) Only (i) and (ii) (C) Only (i) and (iii)
(B) Only (ii) and (iii) (D) All the three
28.
Identify the most suitable tool for measuring the length of a badminton court. (A) A metre rule (B) A piece of cloth (C) A half-metre rule (D) A measuring tape
2'.
An object is said to be in motion if it changes its _______ with time. (A) position (B) mass (C) temperature (D) length
Paper Code: UN421
8
CLASS :6
30.
Which device works on the principle that light travels in straight lines ? (A) Bimetallic thermometer (B) Pinhole camera (C) Bell (D) Both (A) and (C)
31.
Which of these is translatory motion ? (A) Rectilinear (B) Periodic (C) Rotatory (D) All of these
32.
Given below are the three different circuits.
E F G Identify the brightness of the bulbs in ascending order. (A) E, F, G (B) F, G, E (C) G, E, F (D) G, F, E 33.
A satellite works with the help of energy source from (A) a rechargeable battery. (B) petrol. (C) a dry cell. (D) the sun.
34.
Where does a compass work ? (A) Only in oceans or seas (B) Only on land, where the earths magnetic field is strong (C) Only on high mountains (D) At all the places within the earths magnetic field
3#.
Which unit is used to measure distances between cities ? (A) Kilometre (B) Metre (C) Centimetre (D) Millimetre Paper Code: UN421
9
CLASS :6
3$.
Study the circuit diagram shown below.
P
Q
R S
Which bulb glows the brightest ? (A) P (B) S (C) Q 37.
Two magnets are placed close to each other as shown below. Which set will attract each other ? (A)
(B)
N
S
N
S
N
N
S
S
(C) S
(D) 38.
(D) R
N
N
S
S
N
N
S
An artificial source of light is (A) the sun. (B) a firefly. (C) the star. (D) an electric bulb.
Paper Code: UN421
10
CLASS :6
3'.
A unit that always has the same measure for every person is called a (A) national unit. (B) standard unit. (C) fundamental unit. (D) derived unit.
40.
An iron nail is magnetized by stroking with a magnet several times as shown below. 1
2 3
nail
4
Which one shows the correct correspondence between the poles and the numbers ? (A) 1 N, 2 S, ! S, 4 N (B) 1 N, 2 S, ! N, 4 S (C) 1 N, 2 N, ! S, 4 S (D) 1 S, 2 S, ! N, 4 N 41.
The length of the shadow of a tree will keep changing with respect to (A) the sun. (B) a lamp. (C) a distant star. (D) a torch.
42.
Which statement is not true ? (A) You will get electrocuted if you handle live wires. (B) The rubber glove is a good insulator to protect us from electric shocks. (C) The rubber gloves control the electric current flow. (D) Electricity cannot flow through rubber.
Paper Code: UN421
11
CLASS :6
43.
A magnet is placed near an iron rod as shown below. What is the magnetic pole induced at X ? What is the name of the process ? iron rod
)
+
44.
The moon is a non-luminous object but still it is visible to us. Why ? (A) The moonlight travels only in the form of rays. (B) The moon reflects the light falling on it from the sun. (C) The moonlight emits visible light. (D) The moonlight travels in curved paths.
4#.
Identify an incorrect statement. (A) Curvilinear and rectilinear motions together form translatory motion. (B) Rotatory motion is always oscillatory. (C) Motion of a stone dropped from a roof is rectilinear. (D) Motion of a simple pendulum is periodic.
4$.
What is used to light a torch ? (A) Car battery (B) Dry cell (C) Button cell (D) Both (A) and (B) Paper Code: UN421
12
CLASS :6
47.
Which part of the horse-shoe magnet attracts the most pins ?
)
& &
!
+
!
&
&
P S
Magnet N S
Q
R
48.
Which statement about light is correct ? (A) A pinhole camera can take pictures of moving objects. (B) The image formed on the screen of a pin hole camera is erect. (C) Light rays incident on a mirror can be reflected. (D) Opaque objects emit light of their own.
4'.
Which material best conducts electricity ? (A) Carbon (B) Water (C) Silver (D) Copper
#0.
If we take a look at a compass while facing the west, in which direction will the needle of the compass point ? W
E
)
*
Paper Code: UN421
+
,
13
CLASS :6
Chemistry
Class : 6 #1.
Choose the incorrect statement. (A) The heating of sugar is a permanent change. (B) Sugar decomposes to form charcoal. (C) The crystallisation of sugar is a chemical change. (D) The powdering of sugar is a physical change.
#2.
A mixture (A) has substances in it that are chemically combined. (B) can always be separated using filtration. (C) contains substances that are not mixed in a definite ratio. (D) all of the above
#3.
If opacity is the distinct feature of wood, then what is glass known for in the same way ? (A) Its transparency (B) Its magnetic nature (C) Its conductivity to heat (D) Its lustrous nature
#4.
Which process contributes to the phase change of water from liquid to gaseous state ? (A) Evaporation (B) Transpiration (C) Precipitation (D) Both (A) and (B)
##.
Identify a physical change. (A) Oxidation (B) Reduction (C) Sublimation (D) Decomposition Paper Code: UN421
14
CLASS :6
#$.
A flexible material will return to its original shape and size after being (A) bent. (B) stretched. (C) compressed. (D) all the three
#7.
Which property does not relate to air ? (A) Air is a homogeneous mixture of gases (B) Air is not a matter because it cannot be seen (C) Air is highly compressible (D) Air exerts pressure
#8.
The relative humidity of a place is the amount of (A) sunshine. (B) water vapour in the air. (C) rainfall in the past 24 hours. (D) gases in air.
#'.
The substances like wood, brick, etc., which do not allow any light to pass through them are called (A) transparent objects. (B) translucent objects. (C) opaque objects. (D) none of these
$0.
Sieving can be used only when the components of the mixture have different (A) sizes. (B) melting points. (C) boiling points. (D) densities. Paper Code: UN421
15
CLASS :6
$1.
Copper and silver, wood and air, water and mercury are called (A) conductors. (B) insulators. (C) liquids. (D) all the three
$2.
When you burn petrol, flames appear. What type of a reaction is this ? (A) An endothermic reaction (B) An exothermic reaction (C) A physical change (D) A reversible reaction
$3.
Filtration is a method used to separate (A) insoluble solids in liquids. (B) soluble solids in liquids. (C) immiscible liquids. (D) miscible liquids.
$4.
The diagram given below shows a part of the water cycle. Water vapour T Oceans
Clouds
What is process T called ? (A) Melting (B) Condensation (C) Evaporation (D) Boiling Paper Code: UN421
16
CLASS :6
$#.
A piece of plywood, labelled X, can support weights of upto 2#0 kg. Another piece labelled Y can support weights of upto 1'0 kg. Piece X is _______ than piece Y. (A) harder (B) more flexible (C) stronger (D) denser
$$.
Which non-reactive gas makes up a major part of the air ? (A) Nitrogen (B) Argon (C) Helium (D) Neon
$7.
Boiling, condensation, freezing, melting and evaporation are usually (A) physical changes. (B) chemical changes. (C) permanent changes. (D) irreversible changes.
$8.
Which statement describes elements ? (A) All the particles in the same element are different. (B) Elements can be broken down into simpler substances. (C) Elements have identical particles of one type. (D) Elements cannot be joined together in chemical reactions. Space fo r rou gh w ork
Paper Code: UN421
17
CLASS :6
$'.
Which instrument is used to measure the density of liquids ? (A) Hydrometer (B) Hygrometer (C) Density meter (D) Ammeter
70.
Which of these events involve condensation ? (A) Formation of clouds (B) Dew found on plants in the morning (C) Droplets of water on the outer surface of a glass filled with ice water (D) All of the above Space fo r rou gh w ork
Paper Code: UN421
18
CLASS :6
Class : 6
Biology
71.
Which of these is non-biodegradable ? (A) Paper (B) Vegetable (C) Plastic bags (D) Animal excreta
72.
Identify the leaf part of the plant. (A) Brinjal (B) Potato (C) Cauliflower (D) Cabbage
73.
Which human joint works same as hinges of door ? (A) Knee joint (B) Shoulder joint (C) Hip joint (D) Skull joint
74.
Bleeding of gums is the symptom of a disease (A) rickets. (B) beri beri. (C) goitre. (D) scurvy.
7#.
Jute fibre is obtained from _______ part of jute plant. (A) leaf (B) seeds (C) root (D) stem
7$.
These animals are similar because they are
(A) herbivores. (C) scavengers.
(B) carnivores. (D) omnivores.
Paper Code: UN421
19
CLASS :6
77.
Identify P, Q, R and S.
(A) (B) (C) (D)
P-style, Q-stigma, R-ovule, S-ovary. P-stigma, Q-style, R-ovary, S-ovule. P-style, Q-ovary, R-ovule, S-stigma. P-style, Q-ovule, R-stigma, S-ovary.
78.
Which process is used to minimise garbage ? (A) Recycle paper. (B) Use vermicomposting at home. (C) Insist on the use of paper bags. (D) All of these.
7'.
Which organ controls all the systems in the human body ? (A) Kidney (B) Stomach (C) Lungs (D) Brain
80.
Which is grouped wrongly in the chart given below ?
.ibres Natural .lax Rayon (A) Flax (C) Terylene
Artificial Terylene Polyester (B) Rayon (D) Polyester
Paper Code: UN421
20
CLASS :6
81.
Which part of the plants given below is eaten as food ?
(A) Roots (C) Flowers 82.
What do the arrows in the figure given indicate ?
(A) (B) (C) (D) 83.
84.
The process of transpiration The exchange of gases with the surroundings. Transportation of sugar. Path taken by sunlight.
Identify an edible stem. (A) Radish (C) Turnip
(B) Ginger (D) Carrot
Which vitamin is present in the given substances ?
(A) Vitamin E (C) Vitamin K 8#.
(B) Leaves (D) Stems
(B) Vitamin D (D) Vitamin C
Which food is a source of roughage ? (A) Cooked rice (B) Eggs (C) Whole grains (D) Fish Paper Code: UN421
21
CLASS :6
8$.
What is carried by xylem in plants ? (A) Carbon dioxide (B) Oxygen (C) Sugar (D) Water & mineral Salts
87.
Which animal can be placed in group Z ? X
Z
Animals that live on land
(A) Bird (C) Shark
Y Animals that live in water (B) Frog (D) Dog
88.
In an accident, Nattu injured his knee. Which of these can be used to find out the extent of the injury ? (A) Camera (B) An X-ray (C) Infrared rays (D) UV-rays
8'.
Humus is formed from (A) chemical substances. (C) organic wastes.
'0.
(B) mineral salts. (D) toxic wastes.
Which bone is represented by the part labelled as X in the given figure ?
(A) Femur (C) Ulna
(B) Humerus (D) Tibia Paper Code: UN421
22
CLASS :6
Class : 6
General Awareness
'1.
Which of these units of currency is also the name of a unit of weight ? (A) Dollar (B) Pound (C) Euro (D) Rupee
'2.
Which chess piece usually moves forward in a straight line, but has to move diagonally to capture a piece ? (A) Bishop (B) Rook (C) King (D) Pawn
'3.
What Substance gives human blood its distinctive colour ? (A) Haemoglobin (B) Melanin (C) chlorophyll (D) Bile
'4.
The International airport in New Delhi is named after whom ? (A) Daughter of Mahatma Gandhi (B) Daughter of Jawaharlal Nehru (C) First Prime Minister of India (D) First President of India
'#.
What does the given sign board represent ? (A) Go slow (B) Wet floor (C) No entry (D) School ahead
'$.
In the context of space exploration, what does the P in PSLV stand for ? (A) Planet (B) Polar (C) Power (D) Point Paper Code: UN421
23
CLASS :6
'7.
What are LCD, LED, plasma with reference to television ? (A) Display screens (B) Set top boxes (C) Remotes (D) Lens
'8.
The given logo belongs to which company ? (A) Volkswagon (B) Renault (C) Ford (D) Toyota
''.
How do bees and mosquitoes create a loud buzzing noise ? (A) Rubbing of legs (B) Blinking of eyes (C) Vibrations of Antennae (D) Beating of wings
100.
In which direction does the needle of a compass point ? (A) East (B) West (C) North (D) South Space fo r rou gh w ork
Paper Code: UN421
24
UNIFIED COUNCIL A n I S O 9 0 0 1 : 2008 C e r t i f i e d O r g a n i s a t i o n
NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION - 2015 (UPDATED) Paper Code: UN412 Solutions for Class : 6 Mathematics 1.
2.
(D)
(B)
Side of square C = 42 ÷ 3 = 14
Of the options, only 84, 96 has H.C.F. 12 and difference 12.
Area of square C = 14 × 14 = 196 cm2 Since, each rectangle has two squares.
2 Number of stamps Nithin had = × 90 = 36 5 3 No. of stamps Ashwin had = × 90 = 54 5
Total area of gives figure = 5 × 196 = 980 cm2 9.
(B)
To get ratio of 5 : 4, number of stamps Nithin should have =
5 9
23600 rounded off to nearest thousand = 24000
× 90 = 50
∴ No. of stamps Ashwin must give Nithin
= 50 36 = 14
Their difference = 348000 24000 = 324000 10. (B)
(B)
∠ BAC = 110o 48o 29o = 33o
4.
(A)
Since, a < 0, i.e., a is a negative number.
∴ Number of pupil who choose soccer
= 23% of 1000 = 230
∴ a, 2a, 4a, 8a are negative numbers.
Hence, a is the greatest number. (C)
Total number of parts = 18
11. (C)
Number of shaded parts = 2 Hence, required fraction = 6.
(B)
2 18
=
(B)
15, 25, 35, 45, 65, 75, 85, 95 → 8
7 2 = 3 × +1 5 5
50, 51, 52, 53, 54, 55, ..., 59 → 11
Hence, the missing number is 3.
∴ Least number of cubes needed to make
(B)
12. (C)
For the product of five integers to be negative, there should be atmost five negative integers.
13. (A)
Factors of 176 = 1, 2, 4, 8, 11, 16, 22, 44, 88, 176
Number of cubes in the given solid = 11 It forms a 5 × 3 × 2 cuboid which has 30 cubes.
8.
( )
2 2 2 2 2 1 +1 +1 +1 = 4 1 5 5 5 5 5
2 2 = 31 + 1 5 5
1 9
Hence, 5 appears 19 times between 10 and 100. 7.
Percentage of pupil who choose soccer = 100 35 17 25 = 23%
3.
5.
347890 rounded off to nearest thousand = 348000
Factors of 182 = 1, 2, 91, 182
it a cuboid = 30 11 = 19
Factors of 99 = 1, 3, 9, 11, 33, 99
Since, two squares can fit in rectangle A and rectangle B.
Factors of 101 = 1, 101 Hence, 176 has most number of divisors.
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14. (D)
Perimeter of plot = 2(4x 8) + 2 (x + 10) = 10x + 4
=1−
Cost of fencing the plot for x = 5 = [10(5) + 4] × 14 = 15. (D)
0.75 =
Length of cloth that Keerthi needs
756
= 3.777777 ....m
16 kg
≈ 3.78 m
?
Nisha
2 17 34 = m × 9 3 3
=
75 8 4 3 = ; 0.8 = = 100 4 10 5
Rishi
1 2 2 17 = ; Since, 5 m = m 3 3 3 3
19. (C)
Tina
The greatest common factor of 28 and 36 is 4. Hence, greatest possible length of each bit =4m
2 units → 16 kg 1 unit → 16 ÷ 2 = 8 kg
20. (B)
3 + 4 + 5 = 12 units 12 units → 12 × 8 = 96 kg Their total mass is 96 kg. 16. (C) Height of each triangle = 24 ÷ 2
1 × 8 × 12 2
5 seat table
Total tables
9 10 11
10 9 8
19 19 19
Total people 9 x 4 + 10 x 5 = 86 10 x 4 + 9 x 5 = 85 11 x 4 + 8 x 5 = 84
7 7 3
Hence, 8 tables can seat 5 people.
= 12 cm Area of each triangle =
4 seat table
21. (C)
b
b
= 48 cm2
l
Total area of shaded parts = 48 × 3 = 144 cm2 17. (B)
l
In the given number line,
Perimeter of each rectangle = 24 cm = 2(l + b)
v, w are negative numbers ⇒ z = 0.25, y = 0.75
⇒ l + b = 12 cm
x, y are positive numbers ⇒ x = 0.25, y = 0.75 ∴ v + y = 0 (since v, y has same value)
v + x = 0.75 + 0.25 = 0.50 ⇒
w + x = 0.5 + 0.25 = 0.25 v w = 0.75 (0.5) = 0.25
2
= 12 cm
= 12 cm
Area of square = l2 = 8 × 8 = 64 cm2 22. (A)
2 5 m 3
3l
2
⇒ l = 8 cm
∴ v + x gives the least value.
18. (C)
l
⇒ l+
1.2 + 0.209 = 1.409 ⇒ 1.409 1 0.4 = 0.009 ∴ 0.009 ÷ 9 = 0.001
1 ? 3 Fraction of the required length that Keerthi needs
23. (A)
A : B : C 6
7
:5
7
: 11
7
= 42 : 35 : 77
∴ The value of B and C are 35 and 77 respectively.
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24. (B)
25. (B)
Number of natural numbers divisible by 5 between 1 and 1000 = 199 (excluding 1000)
30. (A)
As we can see the stamps through the plastic, we can conclude that the plastic allows light to pass through it.
1
31. (C)
Alkaline batteries are similar to dry cells. A common dry cell is the zinc carbon battery that produces a nominal voltage of 1.5 V, the same as the alkaline battery (as both use the same zinc manganese dioxide combination). Both cannot be recharged. Hence, they cannot be used in mobile phones. Some alkaline batteries can be recharged, but the voltage produced by them is not sufficient for its use in mobile phones. A mobile phone can be charged by a charger having a voltage of 5 V or slightly higher than this voltage.
32. (B)
Length of eraser = 4 cm 0.5 cm = 3.5 cm
33. (C)
When a bar magnet is broken into two parts, each broken part has two poles: a North pole (N-pole) and a South pole (S-pole).
34. (C)
Wooden Chair is an opaque object. As light cannot pass through the wooden chair, its shadow is formed. When light falls on any opaque object, it gets reflected. This reflected light enters our eyes and enables us to see opaque objects.
35. (B)
All length/distance measurements involve a starting point and an ending point. Depending on the type of length/distance, various measuring instruments like ruler, measuring tape, opisometer etc., are used. Height, length, breadth, thickness , diameter, distance etc., are all length measurements.
36. (D)
The compass needle is a magnet. When two like poles meet, they will repel away from each other. When repulsion happens, it can be concluded that both items are magnets. When attraction happens, it can only be concluded that either one of the items is a magnet and not necessary both.
37. (A)
The part P is wrongly labelled. It is zinc can/case which acts as negative electrode in a dry cell and carbon rod acts a positive electrode.
38. (D)
A brick wall is opaque (does not let light through), glass window is transparent (lets light through without distortion) and a plastic light shade is translucent (lets light through with diffuse scattering), Only in option (D) are the objects correctly placed under the headings. The other options are incorrect.
39. (B)
From the tabulated results of students X and Y with respect to the use of their finger spans to measure the length of their teachers table, statement (B) is correct.
4 1 5
of circle =
of circle =
1 4 1 5
× 360o = 90o
× 360o = 72o
⇒ 90o 72o = 18o ∴ There are 18o degrees more in
circle than in
1 5
1 4
of
of circle.
Physics 26. (D)
If the ball is placed between two sources of light, it will have two shadows instead of three. If the ball is being rotated under a light source, it will have only one shadow. As the ball is round, no matter which side of it is facing the light source, it will create a shadow at the same position. If the ball is placed under a light source at three different positions, it will have three separate shadows that are not connected to each other. If three sources of light from different positions are shone on the ball, the ball will have three separate shadows that are connected.
27. (C)
28. (B)
29. (B)
The needle of a compass is a magnet. The needle is suspended on a sharp point to minimise the effect of friction such that the weak magnetic field of the earth can cause the north-seeking pole to point to the north and the south-seeking pole to point to the south. The north-seeking pole of the compass needle is at the arrow head and the south-seeking pole is at the other end. 15 km/hour means the cyclists travel 15 km in every 1 hour. After 2 hours, they travel 30 km. Since, two cyclists are moving towards each other at the same time, in 2 hours both travel 30 km and hit each other at the middle point. The brightness of the lamps increases when there are more batteries or there are fewer lamps used in a circuit. Lamp R, which has 2 batteries, is the brightest, Lamp P will have 2 1 the brightness of R. Lamp Q will have 3 2
1 the brightness of P. Lamp S will have the 2 brightness of P.
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(i) 25 finger spans of student X indicate that he has long fingers.
placed in front of it. A sand paper is opaque. When light falls on a piece of sand paper, it is reflected and scattered at different angles. It absorbs light and does not form images when objects are placed in front of it.
(ii) 31 finger spans of student Y indicate that he has short fingers. We can conclude that different people have different sized body parts. 40. (C)
The process by which a magnetic material, such as iron or steel, becomes magnetised by a magnetic field is known as magnetic induction.
41. (B)
The wires in a closed circuit should connect to the metal casing and the metal tip of the bulb. Hence, the filament must be connected to both the metal casing and metal tip in order for the current to flow through. Option (A) is wrong as only the metal tip is connected to the filament. Option (C) is wrong as only the metal casing is connected to the filament. Option (D) is not correct as there is no connection between the filament to the metal casing and tip.
42. (B)
Fabric is a translucent material. It forms a light shadow as it allows light to pass through it partially. Metal is an opaque object. It forms a dark shadow because light cannot pass through it completely.
47. (C)
When the light from the light source shines on the clear blue plastic sheet, only blue light will pass through the blue plastic sheet. As the ball is opaque, the blue light will be blocked by the ball. Thus, a dark round shadow is formed on the screen.
48. (C)
Mercury, a liquid metal is grouped wrongly. It should be placed in metals as it conducts electricity. Steel, nickel and brass are metals which can conduct electricity. Rubber and glass are non-metals which cannot conduct electricity.
49. (C)
Electromagnets are used in electric bells, electric motors, electric trains, toy cars, fans, cranes, radios, mobiles etc.
50. (C)
A potter shaping a pot on its axis in the middle as the wheel is rotating. It is an example of rotatory motion. Chemistry
51. (B)
Clear glass is a transparent material. It does not form a shadow as light passes through it completely.
Evaporation is the cause for lowering the level of water in the beaker. Evaporation is a continuous process, that occurs all the time, at any temperature from all water bodies, wet substances etc.
43. (D)
Magnetic force can pass through nonmagnetic materials such as rubber.
Condensation : When water vapour is cooled, it changes to water.
44. (A)
A cubit of a person measures the length from his/her elbow upto his/her longest finger tip.
Boiling : Change of water into water vapour at a fixed temperature of 100 oC. Freezing : Change of liquid water to solid ice at 0 oC 52. (B)
Evaporation of any liquid depends on the surface area exposed to the atmosphere, temperature, humidity and wind speed. Among the given containers, container in option (B) has greater surface area. So, evaporation takes place faster in it and produces salt first.
1 Foot = 304 .8 mm 1 Fathom = 6 feet Finger spans vary in length from person to person. 45. (D)
46. (C)
In order to connect X and Y, the switch arm needs to be switched to position X. As a result, electricity will be able to flow through the circuit X to light up the bulb. Comparison between sand paper and a mirror are true in options (A), (B) and (D). A mirror can produce images when objects are
Sea water has many salts in dissolved form and common salt has a major share of 3.5 3.8% in it.
53. (A)
Copper is a metal. Metals are good conductors of heat and electricity.
54. (C)
A bar of chocolate when placed in the sun for 2 hours absorbs heat from the sun and changes to liquid. Plastic bucket, metal spoon and rubber band absorb heat from the sun but this temperature is not sufficient for them to convert into liquid form.
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55. (D)
Statements (A), (B) and (C) are true of water vapour in the air. Water is a liquid. Water vapour is a gaseous form of water.
66. (B)
Ceramic and plastic are man-made materials. Tin is a metal obtained from the ground. Wood is obtained from trees.
56. (B)
Things in Group X are made from plant/tree parts. Things in Group Y are made from materials found in the ground. Things in Group Z are made from animals. The balloon is made from rubber sap which is obtained from the rubber tree.
67. (B)
57. (B)
The only gas in the atmospheric air which supports burning of substances is oxygen. It is the second major gas in the atmosphere.
When alum is added to muddy water, a part of it dissolves. The molecules/particles in alum get attached to the mud, clay or dust particles which become heavier and settle down at the bottom. This water is filtered and boiled to obtain water that is clear, clean free from germs. This process is called coagulation or loading.
68. (A)
(i)
58. (C)
A soluble solid i.e., solute is salt and solvent is water. As the solvent evaporates, the solute left behind has many impurities. This impurities are removed to obtain pure salt crystals.
59. (B)
X is melting of wax which is a physical and reversible change. When solid wax is heated, it melts and changes to liquid. On cooling, it changes to solid again. There is only a change in state. Hence, it is a physical and reversible change. Y is making of ice from water. There is change of state from liquid water to solid ice. It is a physical and reversible change.
60. (D)
(ii) Water vapour that rises in the air, is cooled and condensed to form millions of tiny droplets of water. (iii) These droplets float about and form clouds. The clouds get heavy when a lot of water condenses. (iv) The water droplets fall back to the earth as rain. 69. (B)
Butter changes its state when it gains or loses heat.
70. (B)
Candle II is placed in a container that has no holes but has a lid. Hence, external air cannot enter. Burning requires oxygen. Once the oxygen in the container is used up, the candle will be extinguished.
(i) A brick breaks easily when dropped from a height. (ii) It sinks in water.
61. (C) 62. (A)
Heat from the sun causes water to evaporate from lakes, seas and rivers and changes to water vapour.
Biology
(iii) It is made of clay which does not allow light to pass through.
71. (B)
Beaker X is smaller than beaker Y. Beaker X contains less oxygen than beaker Y.
Chloroplasts are found mostly in a leaf. A leaf synthesises food for the plant.
72. (C)
Vitamins are protective food.
73. (B)
An algae is a food producer.
74. (D)
Fishes have endoskeleton made of cartilage, scorpion with exoskeleton and worm with hydrostatic skeleton.
75. (D)
Calyx is the outermost whorl of flower. It provide protection to reproductive parts.
76. (A)
Roots growing towards water of plants to stimulus is true.
77. (C)
The joint that is shown in the given figure is of hinge joint. A hinge joint is very strong that can only move back and forth like a regular door.
78. (D)
Flattened body shape of cockroach help it to crawl between crevices and spaces easily.
79. (C)
Stigma provide the platform to the pollens to germinate.
Boiling: When a substance absorbs heat or heated continuously, it starts boiling. It is a fast, man-made process. Evaporation: When a substance absorbs heat from the sun or surroundings of its own and changes from liquid to gaseous state, it is called evaporation. Evaporation of water is a slow, natural process. Condensation : When water vapour is cooled, it changes to water. It is a natural process. Freezing : Change of liquid water to solid ice at 0 oC. It is a man-made process.
63. (A)
The most important property of a raincoat is to keep the user dry i.e., waterproof.
64. (D)
In all the cases, dust is filtered out from the air by using filtration method.
65. (C)
Evaporation is the fastest on a sunny and windy day with low humidity.
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80
(C)
Green plants are food producers and they are also called autotrophs.
81. (D)
As per the given information, animal X is an aquatic animal that breathes through gills, and animal Y is an aquatic animal breathes through lungs.
82. (A)
83. (D)
84. (D)
Blubber is a layer of fat fat under the skin of polar region animals this helps them to keep their body warm to prevent cold. Root hairs absorb water from the soil and is conducted to leaves through roots and water carrying tubes in the stem. The transport system in plant carries sugar, water and mineral salts.
85. (B)
Cashew nuts and full cream milk contain fat.
86. (D)
Camels stores their food and fat in their humps.
87. (B)
Carrot contains a nutrient called β carotene, β -carotene is converted into vitamin A in the human intestine by the action of bile produced by the liver.
88. (B)
Oesophagus or food pipe is a part of the digestive system.
89. (D)
Shedding leaves, having thick fleshy leaves and leaves with waxy surface help a xerophytic plant to prevent loss of water from the plant.
90. (A)
Moulds and bacteria are decomposers.
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UNIFIED COUNCIL A n I S O 9 0 0 1 : 2008 C e r t i f i e d O r g a n i s a t i o n
NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION Paper Code: UN415 Solutions for Class : 6
Mathematics 1.
2.
a cm 2 Perimeter = 4 × side
10. ,
+
Side of square =
*
a = 4 × cm = 2a cm 2 All fractions have the same numerator.
2 × 2 squares = 9
So, the fraction having the smallest denominator is the largest. ∴
29 is the required largest fraction. 23
3.
)
A triangle with a right angle is called a right angled triangle.
4.
,
Numbers having 2 in numbers from 1 to 100 are 2, 12, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 42, 52, 62, 72, 82, 92.
3 × 3 squares = 4 4 × 4 squares = 1
)
3.50 + 4.05
7.550 − 6.005
7.55
1.545
6.
,
The product of all odd factors is odd.
7.
+
side × side = 4 × side
= 16 + 9 + 4 + 1 = 30 11. +
From the given number line, p is -9 and q is 6. So, p + q = 9 + 6 = 3.
12. +
1 sq. m = 10,000 sq. cm
13. )
1 ⎡ 2 1 4⎤ 36 − ⎢12 + 13 + 5 ⎥ 3 ⎣ 5 2 15 ⎦
+
The smallest 4-digit number formed is 1035. In this 3 is in the tens place.
9.
*
Apply BODMAS rule.
9 − [8 + {7 − (6 − 5 − 4)}] − 1
⇒
109 ⎡ 62 27 79 ⎤ −⎢ + + ⎥ 3 2 15 ⎦ ⎣5
⇒
109 ⎡ 62 × 2 + 27 × 15 + 79 × 2 ⎤ − ⎥ 3 ⎢⎣ 30 ⎦
⇒
109 ⎡ 372 + 405 + 158 ⎤ − ⎥ 3 ⎢⎣ 30 ⎦
⇒
109 935 1090 − 935 155 − ⇒ = 3 30 30 30
=
∴ side = 4
8.
Total number of squares in the figure
∴
So, 2 appears 20 times. 5.
Count the unit squares (= 16)
31 1 =5 6 6
∴ Length of rope left = 5
14. ,
1 m 6
Tolling together for next time means tolling after the least possible seconds which is the L.C.M of 9, 12 and 15.
= 9 − [8 + {7 − (6 − 1)}] − 1
3 9, 12, 15 3, 4, 5
= 9 [8 + {7 5)} 1
L.C.M = 3 × 3 × 4 × 5 = 180 minutes
= 9 [8 + 2] 1 = 9 10 1 = 9 11 = 2
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180 hours = 3 hours 60
15. +
From the figure,
30. +
By adding a pinch of salt to pure water, it can conduct electricity. Here, salt is an electrolyte when it forms solution with water. A solution of salt in water is a conductor of electricity.
∴ 3x° = 3 × 45° = 135°
31. ,
All the statements are correct about air.
16. +
The place value of a digit increases by 10 times as it moves from right to left in a place value chart.
32. +
17. +
Addition and multiplication of whole numbers satisfy closure property.
18. +
The largest negative integer has the least value.
19. +
)* ≠ * ) as their initial points are different and their directions are different.
The block executes curvilinear motion as it moves on a curved path. In the case of oscillatory motion, one end of the pendulum, swing, engine or needle end of a sewing machine is firmly fixed and the other end is free to oscillate. As per the given figure, the block is not tied with a thread or string. When released from one end of a curved path it continues to move to and fro and comes back to rest due to the force of gravity at the centre.
33. *
Bulbs I, III, IV and V are properly connected to the two terminals i.e., metal casing of the bulb and metal tip at the base of the bulb. Hence, four bulbs will light up. Bulb II does not light up as both the terminals are connected to the metal casing of the bulb.
xo + 3xo = 180o (straight angle)
⇒ 4xo = 180o ⇒ xo = 45o
20. )
H.C.F. of two coprime numbers is 1.
21. )
5 5 5 + 5 10 + = = 9 9 9 9
22. +
The two parts are : a rectangle and a triangle.
23. )
Each J represents 600.
The circuit is complete as there is flow of electrical energy except for bulb II. Bulb II is not fused. For a bulb to light up, it needs both the charges (+/). If the bulb receives two similar charges, then it will not light up.
So, 2400 can be represented by J J J J. 24. +
Diameter of the circle = side of the square So length of side of square = 2 × 4 cm = 8 cm
34. ,
∴ Perimeter of the square = 4 × 8
= 32 cm 25. ,
Commutativity under subtraction of whole numbers. ⇒P Q = Q P
In the case of a bar magnet, the two poles North and South are at the extreme ends. In a horse-shoe magnet, the poles point in the same direction and are very close together. The magnetic force of attraction is direct and more concentrated in between the two poles.
Physics 26. *
Copper has high electrical conductivity and hence it is used to make electrical wires.
27. +
We cannot see an object when there is no light.
28. +
35. )
A car taking a turn on a curved road is in curvilinear motion. Motion of a swing, motion of needle end of a sewing machine and motion of an engine piston are in periodic motion.
36. )
In an electric torch, electric energy is converted into heat energy.
1 metre = 100 cm 10 metres = 100 × 10 = 1,000 cm
29. )
Like poles (north-north or south-south) repel each other, whereas unlike poles (north-south or south-north) attract each other.
Magnetic poles or the poles of a magnet are the two free ends of a horse-shoe magnet. The pull force of a horse-shoe magnet is maximum in between the two poles. Magnetic force is minimum at the centre of a magnet.
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37. *
38. *
When a magnet is cut into two pieces, each piece will be a magnet on its own. The magnet would not become stronger, lose its magnetism totally or have a piece stronger than the other. Shadows are formed when the path of light is obstructed by opaque objects which may be living or non-living. Hence, shadow formation in the above two cases is real.
39. )
125 mm in length is equal to 0.125 metres as a millimetre indicates one thousandth of a metre.
40 +
A magnetic compass is a simple device which has a magnetic needle. Iron, cobalt and nickel are magnetic metals. The needle of a compass can be made with any one of these metals.
41. +
When light is focussed with a torch on the glass, it does not form a shadow as glass is a transparent object.
42. )
Iron, salt water and mercury are classified as conductors, though mercury is just a fair conductor. Cotton is a good insulator though. On the other hand, pure water is not a good conductor. But when it contains the slightest amount of salt or mineral solids then it becomes a good electrical conductor.
44. *
45. ) 46. )
The poles of the magnet would have stronger magnetic pull than the other parts of the magnet.
48. *
The path along which light travels in a homogeneous medium is called the ray of light.
49. ,
In an ideal circuit, the length of the wire does not affect the brightness of a bulb. The number and the arrangement of batteries will certainly affect the current flowing in the circuit. The more batteries connected in series, the greater the current and hence the brighter the bulbs. The number and the arrangement of bulbs will also affect the resistance in the circuit. The more bulbs connected in series, the greater the resistance, the dimmer the bulbs. Bulbs connected in parallel will not affect the brightness.
50. ,
When we push and rotate the screw with the help of a screw driver, the screw goes into the wood in linear direction. The screw being screwed into the wood is in rotatory as well as in linear motion.
Chemistry 51. ,
Ice is in solid state, it absorbs heat from the surroundings and changes to liquid water. Solid → liquid. Water is in liquid state. On heating, it changes to water vapour. Evaporation also occurs naturally. Liquid → Gas. There is a change of state in both melting and evaporation.
52. +
The magnetic strength of a magnet is concentrated at two points near the ends of the magnet i.e., at the poles.
A mixture of tea leaves and iron filings can be separated by a magnet. Iron filings get attracted to magnet leaving tea leaves behind.
53. *
Figure II represents the translucent medium as the translucent object allows light rays to pass through it partially.
The correct order of increasing hardness is wood (softest), glass, steel and lastly tungsten carbide (hardest).
54. *
6 members in a family used 42,000 l of water in 2 weeks.
If material X is replaced by a conductor, it will allow the current to flow, thus the bulb will light up. Conversely, if it is replaced by an insulator, it will resist the current to flow, thus the bulb will not light up. 43. +
47. ,
Both, the hands of a clock and the spokes of a wheel exhibit rotatory motion. The filament in an electric bulb is made up of tungsten metal. Metals being good conductors allow flow of current through them. When current flows through the filament, it gets heated up to a high temperature and starts glowing to give out light and heat.
=
42000 = 7000 l / 2 weeks 6
Each member used 7000 l in 2 weeks. Quantity of water used by each member in 1 week =
7000 2
= 3500 l/week
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55. *
Wood burns to form ash and CO2 gas is released. It is a chemical change.
56. ,
An object (ball) sinks in oil as its density is more than the density of oil. Otherwise, the object will float.
57. *
58. ,
59. *
60. +
The given experiment shows that air expands when it absorb heat or when is heated. The balloon will expand as air inside the bottle expands. If we leave the bottle long enough or exchange the boiled water with cold water the balloon will contract back to its original form. This is because air inside the bottle releases heat to the outside environment, thus it will contract. Hail consists of masses of ice in layers one above the other. They join together to grow in size and fall on the earth as hail or snow. Keys are made solid and hard to fit exactly into the lock. They cannot easily change shape, hence they can last long. Sieving is one of the physical separating techniques. It is used to separate two solids of different sizes by putting it through sieves with pores big enough only for certain solids that are small enough to pass through.
61. +
Glass is a non-conductor of electricity, transparent and non-malleable as it is brittle (breaks easily).
62. +
Curdling of milk is a slow chemical change.
63. ,
Both filtration and sedimentation are the two techniques that allow separation of insoluble solids from their solvent. In filtration, the suspended solid will be held back by the filter. Sedimentation, on the other hand, allows the solid particles to settle down, leaving clear water above.
64. +
Water is a compound because it contains two different elements joined by chemical bonds.
65. ,
Plastic is a material that is not found in nature. It is man-made.
66. ,
In the process of photosynthesis, green plants absorb carbon dioxide from the air and make food by combining it with water and energy from the sunlight with the help of chlorophyll. In this process,
oxygen is released into the air which is renewed by plants continuously to keep the balance of oxygen almost constant in the atmosphere. 67. *
Photosynthesis is an endothermic (heat absorbing) process. The heat from the sun is absorbed by green plants to carry out chemical processes to make food and release oxygen into the air.
68. )
Stones and other undesirable substances are separated from food grains by hand picking.
69. *
Metals are good conductors of heat and electricity. A frying pan except the handle is usually made of stainless steel, iron or aluminium to conduct heat easily and quickly to the food to cook faster.
70. ,
Water exists in liquid state in all water bodies like rivers, lakes, ponds, reservoirs, seas, oceans etc.
Biology 71. *
P represents solar energy, Q oxygen gas, R CO 2 gas and S represents the movement of water from the roots to all parts of the plant body.
72. *
Tendrils helps the plant to climb up a support.
73. ,
Living things take birth, grow old and die. Before death they reproduce to give birth to youngones. This is true for all the organisms. This cycle of life goes on and on. This is called life cycle.
74. *
Hip and shoulder joints are called ball and socket joint.
75. *
Culturing of earthworms and redworms is called vermicomposting.
76. ,
The above classification is grouped on the basis of their sources. Cotton, jute and flax are obtained from plant sources and fur, leather and silk are obtained from animal sources.
77. *
The given food items are rich in proteins.
78. ,
A plastic glass is a non-biodegradable substance.
79. *
Animals which provide meat and eggs are called poultry birds.
80. )
Deficiency of vitamin D leads to rickets
81. ,
Turnip is a modified root while others are fruits.
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82. *
Biodegradable wastes or organic wastes cannot be recycled.
83. *
The figure represents the interdependence between plants and animals. Animals depend on plants for food and oxygen. Plants depend on animals for carbon dioxide.
84. +
The bones in elbow and knee have hinge joint that allows only back and forth movement.
85. *
Water from the roots of a plant reaches the leaves through the stem of a plant. The stem conducts water to all parts of the plant.
86. +
Wool is obtained from the fleece of sheep. Hence on burning, woollen fibre smell like the burning hair.
87. )
Fibres contain roughage. It prevent constipation.
88. +
In the given food chain X is a herbivore.
89. )
The given information is about paper.
90. ,
Aquatic plants are called hydrophytes. Hydrophytes have nuerous air spaces that make them light and spongy.
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UNIFIED COUNCIL A n I S O 9 0 0 1 : 2008 C e r t i f i e d O r g a n i s a t i o n
NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION Paper Code: UN 418 Solutions for Class : 6 Mathematics 1.
(B)
Literals represent variables.
2.
(D)
6 + 3 + 4 = 13
9.
(A)
3 0.3 10
5 + * + 7 = 12 + * Least value that should be given to * is 1. 3.
(C)
Length of the first box = l unit
10. (A)
Width of the box = b units
11. (C)
A line has no end points. 40 m
Its area = lb sq units.
20 m
Length of the second box = 2l units Width =
20 m
b units 2
40 m
The rectangular plots shown form a square of side 40 m.
b lb sq. units 2 Therefore, the areas of both the boxes are equal. Its area = 2l
4.
(C)
B – A = 0 – (–728) = 728
5.
(B)
Given Q = 2R
Cost of fencing = 4 × 40 ×
= 12. (B)
4
640
Ten lakhs & lakhs places are in the lakhs period.
Q Q = R = 1 13. (B)
R = 1 and Q = 2
2 more pieces.
56 P = Q 14. (B)
Perimeter of the isosceles triangle with ‘p’ units equal sides and ‘q’ units for the third side is 2p + q units.
The value of P is 28.
15. (B)
15 3 3 4 4
When two factors are multiplied we get a product.
16. (D)
The rise in temperature
56 P = 2 P = 56 2 = 28
6.
(C)
15 lies between 3 and 4. 4 The given figure is a pyramid which has 8 edges.
= –1oC – (–6oC)
So
7.
(B)
8.
(D)
= –1oC + 6oC = 5oC 17. (D)
All the given statements are true.
All the given options are correct.
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18. (A)
40 cm + 50 cm + 0.6 100 cm
28. (D)
A fan merely rotates about a fixed axis. But the different points (particles) of its blades are in circular motion. During the rotation, the different particles cover equal distances in equal intervals of time exhibiting periodic motion.
29. (B)
A magnet cannot be demagnetized by cooling it.
30. (A)
Bakelite is a type of plastic, an insulator or a non-conducting material.
31. (C)
The shadow cast by a pole under the sun will be the shortest at 12 noon.
32. (B)
The prefix kilo means 1000.
33. (B)
Bulbs M and N are parallel to one another so the current is shared between both the bulbs. All the current passes through bulb L. Thus, bulb L is brighter than Bulb M or Bulb N.
A perpendicular to a line makes a 90° angle with it.
34. (B)
All types of magnets have two opposite poles i.e., north and south.
Hence, line III is perpendicular to line AB.
35. (D)
Thickness of a dozen coins (12) = 18 cm
= 40 cm + 50 cm + 60 cm = 150 cm 19. (A)
If a = b then a – b = 0 and b – a = 0. So a – b = b – a. Hence commutative law holds good when a = b.
20. (D)
Part of assessment completed on Monday
1 5
Part of assessment completed on Tuesday
3 4
Part of assessment completed on two days
21. (B)
1 3 4 15 19 5 4 20 20
22. (C)
In Roman numerals, 4 = IV and 9 = IX.
23. (C)
7 + 5 = 12 students scored 95 or more than 95 marks.
24. (A)
31.021 – 11.56 = 19.461
25. (C)
3 + 7 (5 + 1) ÷ 3 – 2
Thickness of one coin = = 15 mm 36. (D)
Solar cells allow light energy to be converted into an electrical energy. This electrical energy is then converted to light energy in a calculator.
37. (A)
An iron nail, a battery and a piece of copper wire is needed to make an electromagnet. Wind a piece of copper wire around an iron nail and connect the two ends of copper wire to the two terminals of a battery. Electric current flows through the wire and converts the iron nail into an electromagnet.
38. (A)
Rectilinear propagation of light is defined as straight path of light.
39. (A)
The hands of a clock are fixed at a point and show movement without a change in their position. Similarly, the opening and closing of flowers.
Apply BOBMAS rule 3 + 7 (6) ÷ 3 – 2 3 + 42 ÷ 3 – 2 3 + 14 – 2 17 – 2 = 15
Physics 26. (A)
Electrical insulators are plastic, wood, paper, clay, rubber, etc. Electrical conductors are metals like mercury, tungsten, carbon(graphite), steel, iron, copper, gold, nickel, silver etc.
27. (A)
18 cm =1.5 cm 12
The lens of a magnifying glass will not form a shadow because it will allow all the light to pass through. Mosaic window glass and lens of a sunglass are translucent objects as they allow some of the light to pass through them, therefore they will form shadows.
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40. (A)
S
S
N
42. (B)
IV
S
S N VI
N S V
N S S
A shadow is formed on the side opposite to the source of light. So, when the sun is behind you, your shadow will be in front of you.
The free end of the string of pins is induced as a S-pole. A magnetic S-pole will repel the pins to the right. 48. (A)
The objects that emit light of their own are called huminous objects. The sun and the stars are natural huminous objects. Electric bulb and earthen lamp are manmade huminous objects.
49. (C)
Between the glass bulb and the metal casing of an electric bulb, sealing wax is filled which acts as an insulator and prevents contact between the two terminals.
50. (B)
1 mile = 1609.344 m = 1.609344 km
In circuit R The filament is broken in the bulb. So, the bulb does not light up. Presence of a magnet inside a refrigerator door makes us to apply some force to open the door of a refrigerator as magnetic force always acts on the door to keep it shut. The shape of the shadow depends upon the shape of the object.
45. (A)
The choice of a length-measuring device depends upon the type of measurement to be made. For example, a thin wire, the length of a pencil, distance between two stars etc., are to be measured, then the type of measurement changes. A thin hair strand cannot be measured by using a ruler. To measure it, a screw gauge is used.
46. (A)
N
like poles repel
In circuit P The bulb glows as it is a complete circuit.
44. (D)
N
S
In circuit Q There is no cell and so no current flows to light up the bulb.
43. (B)
The steel pins are induced as magnet by the magnet above to show the attraction property of magnet. The magnetic poles of the steel pins are induced as shown below.
III
N
N
I
S N S N
II
41. (C)
47. (A)
I - VI must be different poles of magnet, so must II - III, IV - V, since they attract each other. That implies I - III - V and II - IV - VI are groups with the same poles of magnet. As such, only II - IV will repel each other.
Chemistry
Electric shock occurs usually when you are in contact with a stripped wire. The electrons flow through your body all the way to the ground, causing you to get electric shock. Rubber is a very good insulator which means it resists the flow of electric charge when you wear rubber shoes, it prevents electrons from flowing to the ground.
51. (C)
A change among substances cannot occur on its own. There is always a cause that brings about a change. So, a change among substances involves an interaction with each other under proper and right conditions.
52. (D)
A mixture of solid-in-solid is called an alloy.
53. (D)
Alcohol and water mix up with one another. Sugar is a solute(solid) and water(liquid) is a solvent. Sugar dissolves in water and forms a transparent solution. Sand does not dissolve in water.
54. (D)
The water cycle does not only occur in the day or the night. It occurs continuously regardless of time. The water cycle is important to all living beings as they cannot survive without water.
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55. (D)
When water freezes to ice and water vapour condenses to form water, heat is released. Both are exothermic processes.
56. (B)
A solution that does not dissolve any more salt than the required quantity at a particular temperature is called a saturated solution.
57. (D)
The temperature of the air changes periodically with change in seasons and also vertically and horizontally during day time and night time(sea breeze and land breeze).
58. (D)
64. (C)
Beside the exposed surface area, other factors that affect the rate of evaporation are temperature, wind, humidity etc.
Condensation is the process of water in gaseous state changing into liquid state when it loses heat. • Spectacles become misty because the water vapour in the air touches the cold surface of the spectacles. • The white cloud that we see when water is boiling is steam turning into drops of water.
65. (C)
Ink and water, milk and water, lime and water are miscible liquids. Oil and water are immiscible liquids.
66. (B)
The most prominent gases in the atmosphere in terms of volume are nitrogen and oxygen. Nitrogen forms four-fifth (78 - 80%) and oxygen forms one-fifth (20 - 21%) by volume in the air.
67. (D)
The making of a gold ring is only a change in the shape of gold. i.e. a physical change. The ring can once again be melted to form pure gold. Hence, it is a reversible, physical change.
68. (A)
Sulphur is a water insoluble solid. So, it is separated from water by filtration.
69. (B)
Light passes through a piece of paper partially as it is translucent.
70. (D)
Solubility of a substance in water depends on temperature. With increase in temperature, solubility of a substance also increases. Water at 60o C has more heat, so sugar dissolves faster and most easily.
71. (B)
Basic needs required for a plant to grow are air, water and sunlight. It prepares its food in the presence of sunlight. Its shoot system or stem respond to light and bends towards the direction of sunlight.
72. (B)
In the chart ‘P’ is hinge joint and Q is ball and socket joint.
73. (C)
Terrestrial ecosystem includes those organisms which live on land. It is classified into three types - Forest ecosystem, Grassland ecosystem and Desert ecosystem.
• The process of water turning into steam is evaporation; it is the opposite of condensation. 59. (D)
Rod X is glass. When a glass rod is placed in boiling water, it does not become hot because it is a bad conductor of both heat and electricity. Rod Y is metal. Metals when touched become cool because they transmit heat away from our body. Thus metals are good conductors of heat.
60. (C)
Air is a mixture of several gases. It is a combination of two or more substances which are not joined together chemically.
61. (C)
The density of iron is more than that of sponge.
62. (B)
Low and high tides in the sea are formed periodically due to the gravitational force of attraction which the moon and the sun exert on the water surface in the sea.
63. (C)
Decantation can be used to separate two immiscible liquids like oil and water. When this two liquids are allowed to stand in a container for sometime, they form two separate layers. Oil being lighter floats above heavier water. The top layer of oil can be poured into another container.
One of the factors affecting the rate of evaporation of water in a container is its surface area, The wider the surface area the quicker the evaporation process will be. We can see that the upper surface area of option (A) is the smallest and that of option (C) is the biggest. We need not compare surface area of option (B) and (D) as long as we can identify that option (C) is the widest.
Biology
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74. (C)
Given figure is of fibrous root. Many small roots arise from the point where the stem touches the ground.
75. (C)
82. (A)
The given plants are examples of climbers.
The organism ‘X’ is a rabbit. Rabbit is a mammal that have hair on their bodies. They give birth to young ones that feed on their mother’s milk.
83. (A)
Pivot joint is present at neck.
76. (D)
Pulses contains proteins.
84. (C)
77. (A)
Animals in the given figure are herbivores.
The given correlation shows fibre and its sources. Silk is obtained from silkworm cocoon and wool from the fleece of sheep.
78. (B)
Banana peel is a biodegradable food substance and it cannot be recycled.
85. (B)
Cotton fibre is obtained from cotton bolls.
79. (C)
Part labelled in the given figure as R are fallen leaves. Fallen leaves are nonliving.
86. (A)
Option ‘A’ consists of a herbivore (Giraffe), carnivore (houselizard) and an omnivore (rat).
80. (C)
Deficiency of vitamin C causes scurvy. Vitamin C is necessary for keeping gums and joints healthy and building resistance to infections.
87. (C)
Radish is an edible root.
88. (C)
Butter is an animal product.
89. (D)
The product ‘X’ is paper. Paper is biodegradable, useful and can be recycled into paper once again.
90. (D)
Fins and tail help the fish to move in water.
81. (A)
If waste is managed properly by recycling and composting. Water, air and land pollution can be reduced and natural resources can be conserved.
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UNIFIED COUNCIL A n I S O 9 0 0 1 : 2008 C e r t i f i e d O r g a n i s a t i o n
NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION (UPDATED) Paper Code: UN421 Solutions for Class : 6 Mathematics 1.
(C)
Let
= 4,
=2
+
Required difference 10001 – 998 = 9003
+
+
=2+2+2+2=8 =4 2=8
5.
(C)
A perfect number has the sum of all its factors equal to twice itself.
6.
(C)
7.
(C)
The largest decimal that can be formed using 1, 3, 4 and 6 is 643.1. Through three non-collinear points, 3 line segments can be drawn. B
+
=
+
+
A
+
+
+
= 4 + 4 + 4 + 4 = 16
8.
(C)
The angle formed between the two hands of a clock at 5: 20 is an acute angle.
9.
(B)
8 is not a prime number.
10. (B)
= 2 2 4 = 16
C
l = 2l b = 2b
=
+
+
+
p 2(l b)
p = 2 (2l + 2b)
p = 4(l + b) Hence, 2. 3.
= 4 and
(C)
The greatest negative integer is – 1.
(D)
5 2 4 15 12 8 M 6 3 9 18
4.
(B)
= 2 2(l + b)
=2 11. (D)
43 + 1 = 44 47 – 3 = 44
19 1 1 18 18
Successor of the least 5-digit number = 10001 Predecessor of the greatest 3-digit number = 998
12. (C)
Two different diameters of the same circle can’t be parallel as they both have to pass through the center of the circle.
13. (B,C)
A line has no end points. It can be extended indefinitely on both the sides and an angle whose measure is greater than 90o but less than 180o is an obtuse angle.
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14. (B)
–12 – (–28) = (–12) + (+28) = + 16
15. (D)
0 is one of the even numbers that are both greater than –10 and less than +10.
27. (C)
A glow worm is a luminescent insect and the stars are natural sources of light, while electric bulb is an artificial source of light.
28. (D)
A measuring tape is the most suitable tool for measuring the length of a badminton court.
3 0.75 4
29. (A)
An object is said to be in motion, if it changes its position with time.
The number of prime numbers between 50 and 60 are two. (i.e., 53 and 57).
30. (B)
A pinhole camera is a simple camera without a lens and with a single small aperture - effectively a light-proof box with a small hole on one side. Light from a tree passes through this single point and projects an inverted image on the opposite side of the box. This device uses a property of light that light moves in straight lines.
31. (A)
An object moving as a whole along a straight line shows linear or translatory motion. It means that a car moves as a unit and all its parts move simultaneously through the same distance. A translatory motion is of two types, a straight line motion called rectilinear motion and a curved line motion called curvilinear motion.
32. (D)
The brightness of the bulbs in ascending order is G, F and E.
The product of any number and zero is always zero. The required product is zero.
16. (C) 17. (B)
Hence, if x is the number of primes less than 50, then x + 2 is the number of primes less than 60. 18. (C)
19. (B)
Among the given options an obtuse angled isosceles triangle is the only possible triangle. l
P
Q
R
S
T
U
V
W
X
The points P, Q, R, S, T ... lying on line l are said to be collinear. NOTE: Infinite number of points lying on same line are considered as collinear. 20. (A)
Between 0 and 100 there are 99 whole numbers.
21. (C)
Total no. of pupils in all the 4 classes = 20 5 = 100 pupils.
22. (A)
The missing number is 2. Since 121 is a multiple of 11.
23. (B)
1 1 + 3 6 = 9 ×1 = 1 2 18 2 4
1 is the reciprocal of 4. 4 The average of reciprocals of 3 and 6 equals to reciprocal of 4.
24. (A)
Zero, as the product of 0 and its place value is always 0.
25. (A)
n + 8 = 20 n = 12
(i)
Circuit G has only one battery of 1.5 V. This voltage has to be shared between the two bulbs. Hence, the two bulbs glow less brightly.
(ii)
Circuit F has two batteries of 1.5 V each. As the batteries are arranged in parallel, the resultant voltage 3V = 1.5V. As this circuit will be 2 has only one bulb, it glows more brightly than the two bulbs in circuit G.
By trial and error method, substitute values from each set and find the solution.
Physics 26. (B)
Switches K, M and N must be closed for only Bulb A to light up.
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(iii)
33. (D)
Circuit E has two batteries of 1.5 V each arranged in series. The resultant voltage of this circuit will be 1.5 V + 1.5 V = 3 V. As this circuit has only one bulb, it glows more brightly than the bulb in circuit F.
The energy source for the satellite is the sun. Satellites with solar panels collect solar energy from the sun and convert it into electrical energy. This energy is used either directly or it is stored in an accumulator for future use.
34. (D)
A compass works at all the places within the earth’s magnetic field.
35. (A)
Kilometre is the unit that is used to measure the distance between cities.
36. (A)
Two batteries of 1.5 V each are connected in series resulting in higher voltage of 3 V i.e., 1.5 2. So, bulb P glows the brightest.
37. (D)
41. (A)
The length of the shadow of a tree will keep changing with respect to the changing position of the sun from morning to evening.
42. (C)
Statements (A), (B) and (D) are true. The rubber gloves act as an insulator and prevent the flow of current but it does not control the flow of electric current.
43. (A)
A magnetic pole will induce an opposite pole on the magnetic material to attract it. The process by which a magnetic material, such as iron or steel, becomes magnetised by a magnetic field is known as magnetic induction.
44. (B)
The moon is a non-luminous object but it reflects the light falling on it from the sun.
45. (B)
Rotatory motion is not always oscillatory, as it may not be periodic.
46. (B)
Bulbs Q, R and S are separately connected in parallel. The voltage of 3 V is shared by the three bulbs i.e., 3V = 1V . So, each bulb receives only 3 bulbs 1 Volt, so bulbs Q, R and S glow less brightly than bulb P.
A single dry cell is used to light a small torch. Most of the torch lights have two or more dry cells arranged in series to form a battery for obtaining bright light.
47. (A)
Like poles repel and unlike poles attract. The set in option (D) has both magnets placed with opposite poles facing each other. Hence, they attract each other.
The force of attraction is maximum at the poles of any magnet. So, more pins will get attracted around, below and in between the two poles of a horse-shoe magnet.
48. (C)
Light rays incident on a mirror can be reflected.
49. (C)
Materials that conduct electricity are called conductors. Most metals are conductors of electricity. Carbon (graphite) is an example of a non-metal that is a conductor of electricity. Water and human body are also good conductors. Silver is the best conductor of electricity, though it is too expensive for common use. Copper is the second best conductor, and it is used for electrical wiring in our homes.
50. (C)
When a magnet is able to turn freely, North pole of the magnet will point to the North pole of the Earth and the South pole of the magnet will point to the South pole of the Earth regardless of the direction we are facing. This is because the Earth’s South magnetic pole is located at the North pole and the Earth’s North magnetic pole is located at the South pole.
38. (D)
An artificial source of light is an electric bulb.
39. (B)
A unit that always has the same measure for every person is called a standard unit.
40. (A)
In order to induce magnetism into a nail by stroking, the stroking must be done in one direction from one end of the nail to the other end. The same pole of the magnet must be used throughout the whole process. If the south-pole of the magnet is used for stroking, the first end of the nail, will become the south-pole and the other end becomes the northpole. If the north-pole of the magnet is used for stroking the first end of the nail will become the north-pole and the other end becomes the south-pole.
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Chemistry 51. (C)
52. (C)
When sugar solution is heated, the water will evaporate forming dry crystals of sugar. As no new substance is formed, the crystallisation of sugar is a physical change. Statements (A) and (B) are not true of mixture. A mixture has elements or compounds which do not combine chemically. The constituents of a mixture can be separated easily by physical methods. A mixture contains substances in variable composition.
53. (A)
Wood is opaque whereas glass is transparent.
54. (D)
Evaporation is the way by which water from reservoirs, oceans, ponds, etc., is converted to water vapour, while transpiration is the way by which plants release excess water to their surroundings.
55. (C)
pore size of the filter paper; therefore the solids can be trapped by the filter paper. 64. (B)
Water on the earth evaporates from all water bodies all the time and at all the places. Water vapour rises up with the warm air, cools and condenses to form tiny droplets of water that remain floating in air to form clouds. These tiny droplets come together to form large drops of water, become heavy and fall as rain.
65. (C)
Plywood X can support weights upto 250 kg and plywood Y can support weights upto 190 kg only. It means that plywood X is stronger than plywood Y.
66. (A)
Nitrogen is nearly 78 % in the atmospheric air. It is a non-reactive gas that makes up a major part in the air. Oxygen and nitrogen do not react at ambient temperatures. But at high temperatures, they undergo an endothermic reaction producing various oxides of nitrogen and naturally in a lightning flash.
During sublimation, when a solid substance is heated, it changes directly to gaseous state. Example: Camphor. Napthalene balls placed in between the clothes undergo change of state from solid to gaseous. Sublimation is a physical change.
56. (D)
A flexible material like rubber when bent, stretched or compressed will return to its original shape and size.
57. (B)
Statements (A), (C) and (D) are the true properties of air. Though air cannot be seen by us, it is a gaseous state of matter.
58. (B)
The relative humidity of a place is the amount of water vapour present in the air. It is not fixed as it changes from time to time and from place to place and depends on the temperature.
67. (A)
In all the given processes, there is only change of state. Hence, all are usually physical changes.
68. (C)
Statements (A), (B) and (D) are not true of elements. An element is a substance made up of only one kind of atoms.
59. (C)
Opaque objects do not allow any light to pass through them.
69. (A)
Hydrometer is an instrument used to measure the density of liquids.
60. (A)
Sieving is used only when the components of the mixture are of different sizes.
70. (D)
61. (D)
Copper and silver are conductors, wood and air are insulators, water and mercury are liquids.
Condensation involves the conversion of gaseous water (water vapour) into liquid water. All the three options involve condensation process.
62. (B) 63. (A)
Biology 71. (C)
Heat is released when you burn petrol. So, it is an exothermic reaction.
72. (D) 73. (A)
Filtration is used to separate insoluble solids from liquids. The insoluble solids have bigger particle size compared to the
Plastic bags are non-biodegradable substances. Cabbage is the leaf part of the plant. Kneejoint is also called hinge joint.
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74. (D) 75. (D) 76. (D) 77. (B) 78. (D)
79. (D) 80. (B) 81. (C) 82. (B)
Scurvy disease is also called bleeding of gums. Jute fibre is obtained from the stems of jute plant. The animals given in the picture are omnivores. In the given figure P-stigma, Q-style, Rovary, S-ovule Recycling of paper, vermicomposting, and by insisting on the use of paper and clothbags can minimise garbage. Brain is the controlling system of human body. Rayon is an artificial fibre. Cauliflower and broccoli are flower parts of a plant that we eat. The arrows in the given diagram indicate the exchange of gases with surroundings.
83. (B) 84. (B)
85. (C) 86. (D) 87. (B)
88. (B) 89. (C) 90. (B)
Ginger is an edible stem. Vitamin D helps our body to use calcium for bones and teeth. it is found in sunlight, eggs, butter and milk. Whole grains is a source of roughage. Water and mineral salts are carried by xylem in plants. Z represents an animal that can live both on land and in water. Hence frog, which is an amphibian can be placed in Z. An X-ray gives report to find out the extent of an injury. Humus is formed from organic wastes. X is the humerus.
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