Class 7 Nso 5 Years e Book14

o eb

ok NATIONAL SCIENCE OLYMPIAD

7

5

(2009-2013) Including Set A and Set B of Year 2012 and 2013

Copyright © 2014 Science Olympiad Foundation. Printed with the permision of Science Olympiad Foundation. No part of this publication may be reproduced, transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the copyright holder. Ownership of an ebook does not give the possessor the ebook copyright. All disputes subject to Delhi jurisdiction only.

Disclaimer : The information in this book is to give you the path to success but it does not guarantee 100% success as the strategy is completely dependent on its execution. And it is based on last years papers of NSO exam.

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CLASS 7

Contents ªª 12th NSO 2009 ªª 13th NSO 2010 ªª 14th NSO 2011 ªª 15th NSO 2012 - SET A ªª 15th NSO 2012 - SET B ªª 16th NSO 2013 - SET A ªª 16th NSO 2013 - SET B

MTG Work-Books / olyMpiad Books CLASS 1

International Mathematics Olympiad

National Science Olympiad

International English Olympiad

MTG CSS Series

CLASS 2



National Cyber Olympiad


MTG CSS Series


MTG CSS Series

CLASS 3









MTG CSS Series


MTG CSS Series


MTG CSS Series

CLASS 5




CLASS 6








Science IQ Challenge

Math IQ Challenge


MTG CSS Series

Master Mental Ability in 30 Days

CLASS 8





MTG CSS Series

Math IQ Challenge


Psychology of Success

The Secrets of SUCCESS




Math IQ Challenge








CLASS 10


Math IQ Challenge










Math IQ Challenge







CLASS 12


Math IQ Challenge







Class

1 to 10

JEE Main & Advamced | AIPMT | BOARDS | OLYMPIAD | NTSE

FoUNdaTioN CoUrsE For Classes 8, 9 & 10 Class 8

Class 9

Class 10

Class 7 12th

Year 2009

CLASS 7 | 12th NSO - 2009

MENTAL ABILITY 1.

Jennifer wants to run 3 km. The track she runs on is

1 of a km in length. How many times does Jennifer 4

have to run the length of the track to run a total of 3 km? 3 1 (A) (B) 3 (C) 7 4 4 2.

Ansul took five tests. Each test is of 100 points. Here are Ansul's scores : 85, 87, 87, 89, 97 What is Ansul's mean (average) score for these five tests? (A) 89

3.

4.

(B) 88

(D) 90 w

Which of the following statements is true?

x

(A) Line x is parallel to line y.

(B) Line x is parallel to line z.

(C) Line w is perpendicular to line y.

(D) Line w is perpendicular to line x.

Kavita has

y

z

3

of a cake. She wants to divide evenly among 3 friends. Which expression can be used to find the fraction of the whole cake each friend will get ? 3 4

×

4

3

4

(B)

3

1 ¸ 3

(C)

4

3 ¸ 3 4

(D)

4 × 3 3

Which correctly completes the number sentence ? 7.050 > ..... (A) 7.015

6.

(C) 87

Lines w and x intersect lines y and z to make a rectangle.

(A) 5.

(D) 12

(B) 7.055

(C) 7.100

(D) 7.500 10 cm 10 cm 10 cm E D

The area of the figure ABCDEFGA is

24 cm

(A) 1165 cm 2

24 cm C

F

(B) 1185 cm 2

10 cm

(C) 1195 cm 2

G

100 cm B 15 cm

(D) 1199 cm 2

A

7.

Sunil is allowed to sell 20% of a 20 kg bag of candy each day. Which of the following statements describes the amount of candy in kg he is allowed to sell each day? 20 = 1 (A) 20 ´ 20 = 400 (B) 20 ´ 0.20 = 4 (C) (D) 20 – 20 = 0 20

8.

On a number line, which number is the same distance from 0 as 11? (A) – 11 (B) – 9 (C) 0

9.

(D) 9

The Delhi fire department was testing their new fire engine. At full power, the engine pumped enough water to empty its 520 litres tank in 6.5 minutes. How many litres per minute can the new engine pump? (A) 80 (B) 87 (C) 104 (D) 90

10. Tanu read b number of books this summer. Shreya read 3 more than twice the number of books Tanu read. How many books did Shreya read? (A) b – 2 (B) b + 2 (C) 2b – 3 (D) 2b + 3 12 th NSO | LevelI | Class 7

2


11. Jafar starts his baseball cards collection with 15 cards and buys more each week. The number of cards he owns can be modelled using the expression 15 + 10x, where x is the number of weeks Jafar has been buying baseball cards. What happens to the number of cards in Jafar's collection? (A) His collection increases by 25 cards each week. (B) His collection increases by 15 cards each week. (C) His collection increases by 10 cards each week. (D) His collection increases by 10 times the previous week's total. 12. In an elementary school, there are exactly 3 boys for each girl in every class. If b is the number of boys and g is the number of girls, the equation b = 3g can be used to show this relationship. According to this equation, how many boys are in a class that has 6 girls? (A) 6 (B) 16 (C) 18 (D) 72 13. In a coconut grove, each (x + 2) trees yield 60 nuts each per year, x trees yield 120 nuts each per year and (x – 2) trees yield 180 each nuts per year. If the average yield per year per tree be 100, then x is (A) 4 (B) 3 (C) 2 (D) 1 14. If two triangular figures are congruent, which of the following statements is true? (A) They have the same lengths but different angle measures. (B) They have the same lengths and the same angle measures. (C) They have the same angle measures but different lengths. (D) They have the same type of shape, but lengths and angles can be different. 15. The value of (– 8) × (– 8) × (– 8) × (– 8) × (– 8) + (– 8) × (– 8) × (– 8) × (– 8) × (– 8) is (A) – 2(8) 5

(B) – (2) 16

(C) – (4) 8

(D) All of these

SCIENCE Z X Initial level Y

16. A flask of water is heated to 100°C. X is the initial level of water. When heated, the level of water in X falls to Y then rises to Z, because (A) Expansion of vessel, then expansion of liquid (B) Density of water first increases then decreases (C) Expansion of vessel, then contraction of vessel

Water

(D) Given statement is wrong

Heat

17. Two girls are standing in front of a plane mirror as shown. When girl A looks into the mirror, how far away from her will image of girl B seem to be ? (A) 11 m (B) 16 m (C) 6 m (D) 14 m 18. The graph given here shows how the number of fish vary in different ponds with passing weeks. Study the graph carefully. The pond containing water that is most likely to be not polluted is (A) Pond P

(B) Pond Q

(C) Pond R

(D) Pond S

3 m

8 m

Girl A Girl B

Pond P

Number of fish Pond S

Pond Q Pond R

1 2 3 4 5 6

Week

19. The bob of a simple pendulum is set in to and fro motion. Initially it takes 1 second to complete one oscillation. After 25 oscillations, the bob becomes a little slow. Now the time taken for one complete oscillation is (A) 4 s

(B) 2 s

(C) 1 s 3

(D) None 12 th NSO | LevelI | Class 7


20. Two containers X and Y, of the same size and thickness, contained 1000 ml and 600 ml of water respectively. Both were heated over two separate flames till the water in them boiled. If the water used in both containers took 100 minutes to Container X : 1000 ml Container Y : 600 ml reach boiling point, then the conclusions which can be made is/are (i) the flame used for container X is stronger than that used for container Y (ii) container X is a better conductor of heat than container Y (iii) the water in container X was colder than that in container Y at the beginning of the experiment. (A) (i) only

(B) (ii) only

(C) (i) and (ii) only

21. The given pictures show the shapes of the moon on different nights. The correct shape of the moon on the 19 th of January will be (A)

(B)

(D) (i), (ii) and (iii)

15th January

24th January

(C)

30th January

(D)

22. What conclusion can you make about the average daytime temperature of the planets? (A) The size of the planet determines its temperature (B) The nearer the planet to the Sun, the lower its temperature (C) The distance of the planet from the Sun determines its temperature (D) The longer the planet takes to revolve around the Sun, the higher its temperature 23. In the diagrams below, which of the bulb in the electric circuits will not light up? Rubber

Aluminium

(A)

Rubber

Aluminium

(B)

Aluminium

(C)

Aluminium

(D)

Rubber

Rubber

24. Radha set up a circuit as shown. At the end of the experiment, she concluded that liquid Z is a conductor of electricity. Which of the following led her to such a conclusion? (i) The nichrome wire turns red hot (ii) The bulb lights up (A) (i) only

(B) (ii) only

(C) (i) and (ii)

25. Which one of the following statements is correct ? (A) Concave mirror is used as side view mirror. (B) Convex mirror is used by dentists to examine patients. (C) Convex lens is used as a magnifying glass. (D) Plane mirror forms real images. 12 th NSO | LevelI | Class 7

4

Liquid Z

Nichrome wire

(D) None of these


26. Which of the following is an example of vibratory motion ? (A) A car moving along a circular track (B) A freely falling stone (C) Motion of the strings of a violin (D) Motion of planets around the sun 27. Which of the statements is incorrect ? (A) A wind vane is used to find out the direction of wind (B) The direction of movement of cyclonic storms is anticlockwise in southern hemisphere (C) Hot air rises up, leaving behind a low pressure area (D) None of these 28. Lata performed an experiment by taking sample X in a test tube. To this she added a pinch of Y. On adding Y, Lata heard a hissing sound and observed bubbles of gas coming out. On passing this gas through lime water, it turned milky, due to formation of Z. What could be X, Y and Z ? X Y Z (A) Baking soda Vinegar CaCO 3 (B) Vinegar Baking soda CaCO 3 (C) Vinegar Baking Soda Ca(OH) 2 (D) Baking soda Vinegar Ca(OH) 2 29. A factory fed its wastes into a nearby pond which led to the killing of fishes and other aquatic plants. What measures would you suggest to the factory owner to prevent this ? (A) The wastes must be neutralised before disposal. (B) The wastes must be made acidic before disposal. (C) The wastes must be made basic before disposal. (D) All of these. 30. Water found below the water table is called X. The most important source of X is Y. X and Y are X Y X Y (A) Rain water Ground water (B) Ground water Tap water (C) Rain water Tap water (D) Ground water Rain water 31. Rahul stained his shirt with turmeric. When the stain comes in contact with a solution of X the colour of the stain changes to brick red and when it comes in touch with a solution of Y, the colour again changes to yellow. X and Y respectively are (A) Soap solution and lemon juice (B) Lemon juice and soap solution (C) Lemon juice and vinegar (D) Soap solution and sugar solution 32. Observe the figures carefully. What are P, Q, R and S ? P Q R S (A) Iron sulphate Iron Copper sulphate Copper (B) Copper sulphate Copper Iron sulphate Iron (C) Iron sulphate Copper Copper sulphate Iron (D) Copper sulphate Iron Iron sulphate Copper

Solution of P

Solution of R (green) S

Q

33. Radha recorded the following observations upon performing an experiment. (i) Sample I + 23 drops of phenolphthalein ® pink colour (ii) Sample I + equal amount of sample II ® test tube becomes hot. Which of the following is the most appropriate inference? (A) Sample I is basic (B) Sample II is acidic (C) When equal amounts of both samples are mixed the process of neutralisation takes place (D) All of these 34. According to recent developments, hydrogen is used as a fuel. Hydrogen is first liquefied (process P) and stored in cylinders. This hydrogen is released from the cylinders and then burnt (process Q). Choose the correct statement. (A) Process P is a chemical change (B) Process Q is a physical change (C) Process P is a physical and Q is a chemical change (D) None of these 5

12 th NSO | LevelI | Class 7


35. Which of the following is incorrectly matched ? Substance burnt in O 2

Product formed

(i)

Mg

(ii)

Fe

Fe 2O 3 , rust

(iii)

C

CO 2, gas

(A) (i)

MgO, powdery ash

(B) (ii)

(C) (iii)

36. Which of the following is correct ? (i) (ii) (A) Bitter Sour (B) Sweet Salty (C) Sour Bitter (D) Salty Sweet

(D) All of these Substances

Acidic

Basic

(i) ___ in taste

(ii) ___ in taste

37. Which of these indicates positive test for starch in leaves ? Test Results (A) Lime water Turns milky (B) Iodine solution Turns blueblack (C) Methylated spirit Turns blue (D) Benedict's solution Turns orange 38. The insects captured by insectivorous plants partially fulfil their requirement of (A) Enzymes (B) Oxygen (C) Nitrogen (D) Carbon Black paper 39. The diagram shows a destarched, variegated leaf partly covered by black paper. The plant is placed in bright light for several hours. Four discs are then cut from the leaf in the positions shown and Green part are tested for starch. Which disc(s) contain starch ? White part

(A) Only 1

(B) 1 and 2

(C) Only 2

(D) 3 and 4

1

3

2 4

40. Mohan saw a plant which he thought to be a legume and wanted to see if it had nitrogen fixing bacteria. What would he look for? (A) Absence of root hairs (B) An enlarged taproot (C) Nodules present on root (D) An extensive fibrous root system 41. The tongue is the main organ of taste. Different sets of taste buds are located in specific areas of the tongue. In the given figure, which part of the tongue will tell you that the food is sweet ? (A) P (B) Q (C) R (D) S 42. The given figure represents the human excretory system. In which labelled part the urine is stored ? (A) W

R Q P

W

X

(B) X (C) Y (D) Z 12 th NSO | LevelI | Class 7

S

6


43. The given figures show few modifications for vegetative reproduction. They all are (A) Modified roots (B) Modified underground stems (C) Modified underground leaves (D) All of these

Node Scale leaf

Dry scale Fleshy scale Terminal bud Internode

Directions : Refer the following paragraph to answer Q.no. 44 and Q.no. 45. A large potato is taken and its outer skin is peeled off. One of its ends is cut to make the base flat. A deep and hollow cavity on the opposite side is made. Half of the cavity is filled with sugar solution and the level is marked by inserting a pin in the wall of the potato. The potato is put into a dish containing a small amount of water such that the level of water is below the level of the pin.

Potato Sugar solution Pin

Water

44. What will you observe after few hours ? (A) There is an increase in the level of sugar solution (B) There is a decrease in the level of sugar solution (C) The level of sugar solution remains the same (D) The level of sugar solution initially increases but then decreases suddenly 45. How does this transportation of water take place? (A) Through xylem (B) Through phloem (C) Through movement from one cell to another (D) Both (A) and (B) 46. The wall of the small intestine has many blood vessels. Which of the following statements are correct ? (i) All the food goes into the large intestine (ii) Digested food is passed into the blood vessels (iii) The blood carries the digested food to all parts of the body (iv) Digested food is used to generate energy for the body (v) Undigested food remains in the small intestine. (A) (i), (ii), (iii)

(B) (ii), (iii), (iv)

(C) (i), (iii), (iv)

(D) (ii), (iv), (v)

47. Read the following statements and select the correct option. Statement I : The tropical rainforests support a variety of plants and animals. Statement II : The tropical region generally has a hot climate and it receives plenty of rainfall. (A) Both the statements I and II are true and statement II is the correct explanation of statement I (B) Both the statements I and II are true but statement II is not the correct explanation of statement I (C) Statement I is true but statement II is false (D) Both the statements I & II are false 48. All living organisms respire to get energy from food. The respiration process in yeast can be summarized as with the use of oxygen

(A) Glucose ¾¾ ¾¾¾¾¾¾¾¾ ¾® Carbon dioxide + Water + Energy with the use of oxygen

(B) Glucose ¾¾ ¾¾¾¾¾¾¾¾ ¾® Lactic acid + Energy in the absence of oxygen (C) Glucose ¾¾¾¾¾¾¾¾¾¾¾¾® Lactic acid + Energy in the absence of oxygen (D) Glucose ¾¾¾¾¾¾¾¾¾¾¾¾® Alcohol + Carbon dioxide + Energy

49. The hairy skin of the sheep has two types of fibres that form its fleece: (i) the coarse beard hair and (ii) the fine soft underhair close to the skin. Which of the hair provide the fibres for making wool? (A) (i) (B) (ii) (C) (i) and (ii) (D) None of these 7



50. This picture of soil profile shows the side view of the vertical section cut through the soil to underlying layer of solid rock. Which horizon of the soil profile is richest in humus ?

Horizon P Horizon Q

(A) Horizon P Horizon R

(B) Horizon Q (C) Horizon R

Horizon S

(D) Horizon S

Soil profile

SPACE FOR ROUGH WORK


8

Class 7 13th

Year 2010


MENTAL ABILITY 1.

Arvind owns a computerrepair shop. On Monday he repaired 2 computers.

• He charged ` 15 service fee for each computer he repaired. • He worked a total of 4.5 hours to repair both computers. • He charged ` 35 per hour. Which of the following expressions can be used to find the total amount Arvind charged to repair the 2 computers? (A) 2(15) + 4.5(35) 2.

3.

(D) 15(35) + 4.5(2)

June May April March February January 100

200 300 400 500 Number of story books sold

600

The ratio of boys to the total number of students in Ms. Ankita's class is 4 to 9. The class has a total of 27 students. How many girls are in the class? (B) 50

(C) 15

(D) 12

Which shows 833,000 written in scientific notation? (A) 8.33 ´ 10 3

5.

(C) 4.5(50)

The given graph shows the sale of story books in a bookshop for the first 6 months. In which month was the sale of story books 75% of the sale of books in June ? (A) February (B) March (C) April (D) May

(A) 23 4.

(B) 2(35) + 4(15)

(B) 8.33 ´ 10 4

(C) 8.33 ´ 10 5

(D) 8.33 ´ 10 6

Samrat made a snack mix using ingredients listed below. 1 3 1 1 1 cups almonds, cup peanuts, cup raisins, cup chocolate chips s 4 4 2 4 What is the total amount of all four ingredients? 3 s (A) 1 cups 4

6.

1 (B) 2 cups s 4

1 (C) 2 cups s 8

3 (D) 2 cups s 4 A

In the given figure, AB and CD are straight lines. Find Ðy. (A) 97° (B) 87° (C) 77°

C

(D) 55° 7.

A

The given figure is made up of two equal triangles. Find the area of shaded part. (A) 45 cm 2

(B) 13.5 cm 2

2

2

6

(D) 12.8 cm

B

9 cm

C

Find the value of 4 + 12 ÷ 4 × 2 + 10. (A) 18

9.

35° B

(C) 27 cm 8.

D

48° y

(B) 20

(C) 12

(D) 26

Rahul has x baseball cards. Mayank has 3 times as many baseball cards as Rahul. Raj has 20 baseball cards. Which of the following expressions represents the total number of baseball cards with Rahul, Mayank and Raj all together ? (A) x + 3x + 20


(B) 20 + 3x – x

(C) x + 3 + 20 2

(D) 20 – 3x + x


10. Which of the following statements best describes the water level of the pool from 2 p.m. to 3 p.m.? (A) The pool is empty. (B) The water level is constant. (C) The water level is increasing. (D) The water level is decreasing.

Water level

Wading Pool

11 a.m.12 p.m. 1 p.m. 2 p.m. 3 p.m. 4 p.m.

Time

11. Number of cubes required to make the given figure is (A) 15

(B) 16

(C) 19

(D) 20

12. Lines w and x intersect lines y and z to form a rectangle as shown. Which of the following statements is true? (A) Line x is parallel to line y. (B) Line x is parallel to line z. (C) Line w is perpendicular to line y.

w x y

z

(D) Line w is perpendicular to line x.

13. Which of the following shows a symmetric figure? (A)

(B)

14. The given table shows the pattern between the number of toothpicks used. Which of the following expressions can Radhika u s e to d e te rmi n e th e n u mb e r o f toothpicks used to make n squares? (A) 4n

(C)

(D)

No. of squares

1

2

3

4

n

No. of toothpicks

4

7

10

13

?

Picture

(B) 4n – 1

(C) 3n + 1

(D) 3n – 1

15. What threedimensional shape could be formed by folding this figure on the dashed line segments? (A) Rectangular prism

(B) Square pyramid

(C) Triangular prism

(D) Triangular pyramid

4 cm 4 cm

16. The graph given here shows the motion of four runners P, Q, R and S in a 5 km marathon. Whose motion is the fastest ? (A) P (B) Q (C) R (D) S

Distance (km)

SCIENCE 6 5 4 3 2 1

P

Q R S

1 2 3 4 5 6 Time (h)

17. When the switch of an electric bell is pushed (A) Flow of current stops through the electromagnet in the bell (B) A current starts to flow through the electromagnet (C) Electromagnet becomes inactive (D) None of these 18. What do we call hand spindle in Hindi? (A) Takli

(B) Charkha

(C) Lint 3

(D) Knit 13 th NSO | LevelI | Class 7


50

10 0

50

50

60

60

60

70

70

70

80

80

80

90

90

90

10

10

0

0

110

11

0

110

19. Rohan wants to test whether a white object or a black object would heat up faster in the Sun. The picture shows you his experiment which uses three thermometers 1, 2 and 3. These thermometers were left out in the Sun for 30 minutes.

20

0

(B) Thermometer 2 shows a higher temperature than thermometer 3.

1

Black object 2

10

White

0

0

10

10

20

(A) Thermometer 1 reads the same as thermometer 3.

20

30

30

30

40

40

40

Which of the following statements is true ?

object

3

(C) Thermometer 3 shows higher temperature than thermometer 1. (D) Thermometer 1 reads the same as thermometer 2.

Time

Time

(D)

Distance

(C)

Distance

(B)

Distance

(A)

Distance

20. Which of the following graphs does NOT represent constant speed?

Time

Time

21. The bulb in the circuit given here does not glow. Which labelled part is responsible for this? 1

(A) 1

2

(B) 2 4

(C) 3

–

(D) 4

+

+ 3

–

22. The given figure shows four cells fixed on a board. The correct connection of their terminals to make a battery of four cells is ______

(A)

(B)

(C)

(D)

23. Match column I and column II and select the correct options from the codes given below. Column I Column II (a) Lateral inversion (i) An image which cannot be caught on a screen (b) Luminous (ii) Objects that allow some light to pass through (c) Translucent (iii) Object producing light by itself (d) Virtual (iv) Turned around from left to right (A) a(i), b(ii), c(iii), d(iv)

(B) a(iv), b(iii), c(ii), d(i)

(C) a(iii), b(i), c(iv), d(ii)

(D) a(ii), b(iv), c(i), d(iii)

24. The factor which contribute(s) to the development of cyclones is/are ______ (i) Wind speed (ii) Temperature (iii) Humidity (A) (i) only

(B) (ii) & (iii) only

(C) (i) & (iii) only

(D) All of these

25. In the diagram shown below, paper clips are attracted to the two poles of a bar magnet. The polarity of ends X and Y are ______ (A) Npole and Spole

(B) Npole and Npole

(C) Spole and Spole

(D) Spole and Npole


4

N

S

P

Q

X

Y


26. Miss Megha is 20 cm away from the plane mirror. If she moves few steps closer to the mirror, what will happen to the image size in the mirror ?

20 cm

(A) The size of image will decrease.

(B) The size of image will increase.

(C) The size of image will be same.

(D) Cannot say.

27. Reena prepared several Venn diagrams to find relations between different types of changes. Which Venn diagram made by Reena is correct ?

(A)

Physical Chemical changes changes

(B)

Physical changes

Chemical changes

(C)

Physical changes

Irreversible changes (D)

28. Observe the given flow chart carefully and mark the option that best represents I, II, III and IV. I (A) Mineral

II Base

III Salt

IV Acetic acid

(B) Mineral

Salt

Base

Acetic acid

(C) Salt

Base

Acetic acid

Mineral

(D) Base

Salt

Mineral

Acetic acid

Chemical changes

Irreversible changes

Compounds Acid e.g., H 2SO4 , HCl

I e.g., Mg(OH) 2

II e.g., NaCl

Organic e.g., IV

III e.g., H3PO 4

29. Rajesh performed two different sets of experiments. (i) He burnt a piece of magnesium which gives off bright flames. (ii) He heated a piece of iron which glows red. Which of the conclusions made by Rajesh about his experiments is true ? (A) (i) is a chemical change.

(B) (ii) is a chemical change.

(C) (i) is a physical change.

(D) (ii) is an irreversible change.

30. Statement I : We should plant eucalyptus trees along all sewage ponds. Statement II : Eucalyptus trees absorb all surplus waste water rapidly and release pure water vapour into the atmosphere. (A) Both statements I and II are true and statement II is the correct explanation of statement I. (B) Both statements I and II are true but statement II is not the correct explanation of statement I. (C) Statement I is true but statement II is false.

(D) Both statements I and II are false.

31. A teacher demonstrated an experiment to the students to show the separation of substances by separating the constituents of saline water. What do you think her procedure must have been so as to obtain both the constituents ? (A) She filtered the solution to obtain salt and water (B) She first filtered the solution and then decanted it (C) She decanted the solution to obtain salt and water (D) She first evaporated the water and then condensed the vapours 32. A group of students of class 7th were performing an experiment . Among them a student poured alcohol on a plant continuously for a long time. The plant could not prepare food on its own any more. Which of the following statements explains the reason behind it ? (A) (B) (C) (D)

Alcohol absorbed all the food prepared by the plant. Alcohol does not let the plant absorb carbon dioxide from the air. Alcohol dissolved all the minerals present in the plant. Alcohol dissolved the chlorophyll present in the plant.

5



33. Ravi was given four liquids, 1, 2, 3 and 4. He took each liquid at a time and poured some of it in four beakers filled with water. He observed the following ______ Liquid 1 + water gives immiscible liquid, Liquid 2 + water gives miscible liquid Liquid 3 + water gives immiscible liquid, Liquid 4 + water gives miscible liquid What could liquids 1, 2, 3, and 4, respectively be? 1

2

3

4

(A) Ink

juice

milk

kerosene

(B) Kerosene

milk

ink

mustard oil

(C) Mustard oil

milk

kerosene

ink

(D) Milk

ink

juice

kerosene

34. Sita and Gita are two sisters staying in different cities. Both were gifted an iron statue by their brother. Sita has to take a lot of care to maintain the shine of the statue, however Gita does not need to make such efforts. This is because ______ I. Sita stays in Bombay II. Gita stays in Bombay III. The humid weather of Bombay makes the statue prone to rusting IV. Gita stays in Jaipur. Which of the above reasons is/are correct ? (A) I, II and III

(B) I, III and IV

(C) II and III only

(D) II and IV only

35. Reema classified the objects into two groups. Which of the classifications made by her is incorrect ? Things made of paper

Things made of glass

(A)

(B)

(C)

(D)

36. The plants living in deserts need to reduce the loss of water because water is very scarce in deserts. Which of the following is an adaptation developed by the desert plants to manage the above situation ? (A) They have lots of branches and leaves.

(B) They do not shed leaves in the summer.

(C) They develop roots which come above the ground. (D) Their leaves are modified into spines. 37. The children employed in the silk industry face certain problems that include respiratory disorders, hearing problems, blisters and open wounds, etc. What do you think is the main cause of their respiratory problems? (A) Cramped, damp, dark and poorly ventilated work space. (B) Loud, deafening music playing in the background. (C) Inhalation of vapours from the boiling cocoons and the diesel used to run machines. (D) Checking of the hot water to see whether the silk threads have loosened enough to be removed from the cocoons. 13 th NSO | LevelI | Class 7

6


38. In a normal adult heart beats about 70 to 72 times a minute. In a child the heart beats up to X times a minute. What will come at the place of X ? (A) 120

(B) 65

(C) 80

(D) 75

Direction : Study the figures shown and answer Q. nos. 39 & 40.

b

a

c

d

39. Which beak belongs to a bird that does not feed on animals? (A) (a) only

(B) (b) & (d)

(C) (a) & (c)

(D) (c) only

40. The bird with beak as shown in figure c feeds on (A) Fish

(B) Fruits

(C) Nectar

(D) Insects

41. Match column I with column II and select the correct option from the codes given below : Column I Column II (a) Red eyed frog (i) Long and strong claws (b) New world monkey (ii) Migrate to warmer regions (c) Polar bear (iii) Sticky pads on its feet (d) Siberian cranes (iv) Long tail (A) a(i), b(ii), c(iii), d(iv)

(B) a(iii), b(iv), c(i), d(ii)

(C) a(iv), b(iii), c(ii), d(i)

(D) a(ii), b(iii), c(i), d(iv)

42. Study the figures given below. Which of the following is/are protective food(s)? (A) a (B) b (C) c (D) All of these.

a

c

b

43. • Cool to wear • Absorbs water easily • Soft to touch • Creases easily • Can be washed and ironed easily The above properties describe which of the following fabrics ? (A) Cotton

(B) Silk

(C) Wool

(D) Nylon

44. Which of the following statements are incorrect? (i) Diurnal animals are active during the day. (ii) Soil is the topmost layer of the Earth crust. (iii) Humus is the top soil containing small rocks. (iv) Alluvial and loamy soil are not suitable for growing crops. (A) (i) & (ii)

(B) (ii) & (iii)

(C) (iii) & (iv)

(D) (i) & (iv)

45. Which figure shows the correct flow of blood in and out of the heart? From body

To body

To lungs

To lungs From lungs

To body

From lungs

(A)

(B) To body

(C)

7

From lungs To lungs

(D) From lungs

From body

To body

From Body To lungs

From body



46. In mammals the diaphragm is a muscular membrane that divides the thorax from abdomen. It plays an essential role in breathing. Which of the following labelled parts represents diaphragm in the given figure? (A) P

(B) Q

(C) R

(D) S

P Q R S

47. Match column I with column II and select the correct option from the codes given below. Column I Column II (a) Ovary (i) Lowermost swollen part of pistil (b) Filament (ii) Slender stalk of the stamen (c) Style (iii) Numerous small bead like structures (d) Ovule (iv) Knoblike structure on the top of stamen (e) Anther (v) Elongated tube connecting ovary and stigma (A) a(i), b(ii), c(iii), d(iv), e(v) (C) a(iv), b(v), c(ii), d(iii), e(i)

(B) a(i), b(ii), c(v), d(iii), e(iv) (D) a(iii), b(v), c(ii), d(i), e(iv)

48. Rohan was conducting an experiment regarding food and water movement in the plants. He removed the phloem tissue as shown in the figure. He observed the stem after few days. The stem showed swelling in the upper portion. What can be the reason behind swelling ?

Stem with phloem removed

Swollen tissue

(A) Upward movement of food getting blocked.

(B) Downward movement of food getting blocked.

(C) Upward movement of water getting blocked.

(D) Downward movement of water getting blocked.

49. Bactrian camels found in the Gobi desert of Mongolia have thick fur as compared to the camels found in the Thar desert of Rajasthan. Identify the reason for this from the following given options. (A) Bactrian camels drink more water than camels of Thar desert. (B) Bactrian camels have developed thick fur to protect themselves from low temperature. (C) Bactrian camels have developed thick fur to protect themselves from high temperature. (D) Bactrian camels have thick fat in their hump. 50. Why do you think seeds and fruits need to be dispersed away from the mother plant ? (A) They may fall within the shade of the mother plant and not get enough sunlight. (B) They may not get enough food and moisture from the soil near the mother plant. (C) There may be too many seeds in a small area near the mother plant. (D) Any of these things may happen and prevent the growth of new healthy plant. SPACE FOR ROUGH WORK


8

Class 7 14th

Year 2011

2


MENTAL ABILITY 1.

Sarah dropped a small ball from a ledge and recorded the height the ball reached after each bounce. Initial Height

1st Bounce

2nd Bounce

3rd Bounce

320 cm

80 cm

20 cm

5 cm

Which rule best describes how high the ball reached after each bounce?

(A) The ball reached

1 of its previous height. 2

(C) The ball reached

1 of its previous height. 4

2.

Mohit's fish-tank hose has a tear that is slowly growing longer. On Monday the tear was 1 mm 1 1 long, on Tuesday it was 1 mm long, on Wednesday it was 1 mm long, and on Thursday it was 2 4 3 1 mm long. If this pattern continues, on which day will the tear be exactly 2 1 mm long? 4 2 (A) Friday (B) Saturday (C) Sunday (D) Monday

3.

Amit, Suchera and Neeti start running around a circular track and complete one round in 18, 24

1 of its previous height. 3 1 (D) The ball reached of its previous height. 5 (B) The ball reached

and 32 seconds respectively. In how many least seconds will the three meet again at the starting

point if they all have started running at the same time ? (A) 196 (B) 288 (C) 324

4.

Tara was standing in front of her house when she noticed the shape of the attic window. The

window had exactly one set of parallel sides. Which polygon is the window shaped like? (A) Square (B) Rhombus (C) Rectangle (D) Trapezium

5.

Which picture shows a reflection over the dotted line?

(A)

6.

Nancy wants to draw a flower with rotational symmetry. Which flower should Nancy draw?

(A)

7.

(B)

(B)

(D) None of these

(C)

(D)

(C)

(D)

What approximate value should come in the place of (?) ?

11.003 × 19.998 × 9.010 = ? (B) 1680 (C) 1800

(A) 1710

8.

What is the ratio of Annie's pennies to Jack's pennies ?

(A) 3 : 1

(B) 4 : 1

(C) 6 : 1

(D) 8 : 1

(D) 1980

3 9.

What approximate value will come in place of question mark (?)


1599 × 199 ÷ 49 – 1398 + 3877 = ? (A) 9400

(B) 9000

(C) 8700

(D) 8400

10. Ridhima plans to go to the mall to buy earrings, which cost ` 7 a pair. She has ` 25 but wants to save ` 4 for lunch. Ridhima needs to determine how many pairs of earrings (x), she can buy, so she uses the equation 7x + 4 = 25. How many pairs of earrings can Ridhima buy?

(A) 2 pairs

(B) 3 pairs

(C) 4 pairs

(D) 5 pairs

11. The total area of a circle and a square is equal to 5450 sq. cm. The diameter of the circle is 70 cms. What is the sum of the circumference of the circle and the perimeter of the square ?

(A) 360 cms

(B) 380 cms

(C) 270 cms

(D) None of these

12. In a row of forty boys facing North, R is twelfth from the left end and T is eighteenth from the right end. How many boys are between R and T in the row ?

(A) 10

(B) 11

(C) 12

(D) None of these

13. Pia has a triangular table next to her bed. The tabletop is a right triangle with one acute angle measuring 45°. What is the measure of the other acute angle?

(A) 45°

(B) 60°

(C) 75°

(D) 90°

14. Which of the following conditions is INCORRECT about two adjacent angles ?

(A) Have a common vertex

(B) Have a common arm

(C) Have a common interior

(D) None of these

15. What will come in place of question mark (?) in the following number series ?

13, 16, 22, 33, 51, __ ?_ (A) 89

(B) 78

(C) 102

(D) 69

SCIENCE 16. Three identical containers X, Y and Z were filled with the same amount of tap water, boiling water and ice respectively and left in a room. Which one of the following graphs correctly shows the change in the temperature of the content in each container after some time ?

(A)

Temperature (°C)

Temperature (°C)

Z

Y

X

Y

(B)

X

Time (min)

Z

Temperature (°C)

Temperature (°C)

Time (min)

X

(C)

Z Y

(D)

Time (min)

X Y Z Time (min)

17. Radha set up a circuit as shown.

At the end of the experiment, she concluded that liquid Z is a conductor of electricity. Which of the following led her to such a conclusion?

(i) The nichrome wire turns red hot.

(ii) The bulb lights up.

(A) (i) only

(B) (ii) only

Liquid Z

(C) (i) and (ii)

Nichrome wire

(D) None of these.

4

CLASS 7 | 14th NSO - 2011 Speed (m s–1)

18. The graph shows how the speed of a car changes with time. How far does the car travel before the brakes are

20

applied ? (A) 200 m (B) 250 m (C) 300 m (D) 350 m

10

5 10 15 20 25 30 Time (s)

Direction (Q.No. 19 & 20) : Read the passage carefully and answer the given questions. Aman sets up the experiment as shown. The positions of the torch and object are fixed. 19. When Aman switches the torch on, which one of the following shows the correct shadow formed on the screen?

(A)

(B)

(C)

(D)

20. To cast a bigger shadow on the screen, Aman should move _____.

(A) The object closer to the torch. (C) The object away from the torch.

(B) The screen closer to the object. (D) The torch away from the object.

21. Match the columns and select the correct option from the codes given below.

Column I

Column II

Wind carrying water Dark funnel shaped cloud Moving air Develop in India very frequently a-(iii), b-(ii), c-(iv), d-(i) a-(iv), b-(i), c-(iii), d-(i)

Thunderstorms Tornado Monsoon Wind a-(ii), b-(iv), c-(i), d-(iii) a-(i), b-(ii), c-(iii), d-(iv)

(a) (b) (c) (d) (A) (C)

(i) (ii) (iii) (iv) (B) (D)

22. The image formed by a slide projector on the screen is _____. (A) Real, inverted and diminished. (B) Virtual, upright and diminished. (C) Virtual, upright and magnified. (D) Real, inverted and magnified. 23. The magnet floating on the surface of water came to rest in the position shown in the figure.

The magnet is pointing in the ______ direction. (A) North-south (B) North-west

(C) South-east

(D) East-west.

24. An ice cube was left on the table as shown in the diagram.

After a while, the ice cube started to melt. What inference can we make about the observation?

1. 2. 3. 4. (A)

The ice cube had gained heat. The ice cube had lost heat. The temperature of the ice had increased. The temperature of the ice had decreased. 1 only (B) 1 and 3 only (C) 2 and 3 only

(D) 2 and 4 only.

25. A current carrying coil of an insulated wire wrapped around a piece of iron is called ____. (A) An electric cell (B) An electromagnet (C) An electric wire (D) None of these.

5 26. Two dented ping pong balls were each placed in two beakers of water at different temperatures. What happened to the ping pong balls ?

(A) (B) (C) (D)


Beaker Volume of water (mL)

Temperature of water (°C) Balls expanded in both the beakers. Ball expanded in beaker P and contracted in beaker Q. Ball expanded in beaker P and remained as such in beaker Q. Ball expanded in beaker Q and remained as such in beaker P.

P

Q

500

500

25

80

27. Salt dissolves in water. You can dissolve more salt in a large amount of water than in a small amount. You can also dissolve more salt in hot water than in cold water. Nishita set up an experiment to see how much salt could be dissolved in water. Cylinders P and Q are of the same size. Cylinders R and S are of the same size. Cylinder R holds twice as much as cylinder Q. The cylinders were all filled with water. Nishita added salt to each container, one spoonful at a time. She stopped when no more salt would dissolve in each cylinder. Which cylinder contained the hottest water?

(A) Cylinder P

(B) Cylinder Q

(C) Cylinder R

(D) Cylinder S

28. Study the given flow chart.

Which of the following could be the materials of

V, W, X, Y and Z? V W (A) Oil Metal (B) Oil Rubber (C) Water Rubber (D) Water Rubber

X Plastic Wood Metal Plastic

Y Wood Metal Wood Metal

Z Rubber Plastic Plastic Wood

29. The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Process-X) and then it burns

(Process-Y). The following statements pertain to these changes. Choose the correct one. (A) Process-X is a chemical change. (B) Process-Y is a chemical change. (C) Both processes X and Y are chemical changes. (D) None of these processes is a chemical change.

30. When acids are added to different indicators, some colour changes occur. These colour changes are listed below.

Identify P, Q, R, S and T respectively. P Q (A) Colourless Methyl orange (B) Colourless China rose (C) Pink Methyl orange (D) Pink China rose

R Blue Blue Blue Red

S Red Red Red Blue

T Yellow Yellow Reddish-brown Reddish-brown

6


31. Rishi burnt a magnesium ribbon, and it burnt with a dazzling white flame. A powdery ash was formed. He collected the ash and dissolved it in water. The product formed and nature of the product could be _____.

(A) MgO, acidic (C) Mg(OH)2, basic

(B) MgO, basic (D) Mg(OH)2, acidic

32. In summers, if milk is not refrigerated, it becomes sour. Which of the following is added by milkmen

to fresh milk to prevent the milk from spoiling? (A) Caustic soda (B) Potash alum

(C) Baking soda

(D) Lime water

33. Sunita prepared two cups of water (one hot and one cold),

and then covered them. Look carefully at the results she obtained after 2 minutes.

Which of the following statements about the results is not true?

(A) Water vapour in the surrounding warmer air condenses on the cold metal cover of the cup containing water.

(B) Water particles from the hot water condense when they meet the cool inner surface of the metal cover.

(C) The insulated sides reduce heat loss or gain from the sides of the cup.

(D) When the heated particles of water vapour present in the air above the hot water hit the cold cover, they lose heat and condense.

34. Megha performs a test on starch's presence. She takes a bowl of rice, a piece of bread, a slice of lemon and a slice of cheese. She puts two drops of iodine solution on each food item and notes her observation by putting tick () if the colour of the iodine changes or cross () if the colour of iodine does not change with the given food items. What will be her observation? Rice Bread Lemon Cheese (A)     (B)     (C)     (D)     35. Which of the following are good sources of roughage ? (A) Milk, meat, soyabean, grains (B) Egg, curd, pulses, fruit juice (C) Broccoli, fruits, carrot, spinach (D) Onion, yoghurt, cheese, pulses. 36. Which of the following statements is/are correct ?

(i) (ii) (iii) (A)

Synthetic cloth easily absorbs sweat. Silk is prepared from the cocoon of the silkworm. Terrycot is made from cotton blended with jute fibres. (i) only (B) (ii) only (C) (ii) & (iii)

37. Spinning is done by _____. (A) Charkha (B) Takli 38. What does the given figure show ?

(A) Response to stimulus

(B) Response to photosynthesis

(C) Response to respiration

(D) Response to transpiration.

(C) Both (A) & (B)

(D) (i), (ii) & (iii). (D) None of these.

7


39. The leaves are arranged in different ways in different plants to get maximum exposure of the

sunlight. This arrangement is called ______. (A) Venation (B) Phyllotaxy

(C) Geotropism

(D) Phototropism.

40. Read the given statements and select the correct option.

Statement 1 : The bodies of birds are streamlined.

Statement 2 : Birds have hollow and light bones. (A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. (B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. (C) Statement 1 is true but statement 2 is false. (D) Both statements 1 and 2 are false.

41. From which of the four chambers of ruminant stomach, semi-digested food is moved back to mouth ? (A) Rumen (B) Abomasum (C) Omasum (D) All of these 42. Which one of the following is a correct match? Type of teeth Function (A) Incisors Biting and cutting (B) Canines Crushing and grinding (C) Molars & premolars Piercing and tearing (D) Molars Smaller than premolars 43. Cocoons are treated with

(i)

to dissolve the gummy substance that holds the cocoon filament

in place. After this, filaments of (ii) cocoons are joined and twisted. This is combined with other similarly twisted filaments to make

(iii)

or reeled silk. The reeled silk is made into

(iv)

from

which silk clothes are woven by weavers.

Select the correct sequence of terms to complete the above paragraph.

(i) (A) Chilled water (B) Chilled water (C) Boiled water (D) Boiled water

(ii) 4-8 12-15 4-8 12-15

(iii) Raw silk Smooth silk Raw silk Smooth silk

(iv) Skeins Skeins Skeins Skeins.

44. Which of the following conditions at night will make it warmer ? (A) When sky is clear, without clouds (B) When sky is cloudy (C) When humidity is low (D) When wind blows fast. 45. Beena performed an experiment on two soil samples X and Y as shown, to study the absorption of water by the soil. She poured 100 ml of water in both

X

Y

the samples and noted the percolated water. Identify X and Y. (A) (B) (C) (D)

X Laterite soil Loamy soil Sandy soil Clayey soil

Y Sandy soil Desert soil Clayey soil Sandy soil

Water

60 ml 20 ml

46. Which of the following types of feet are adapted to run on flat ground and to grip prey

respectively ? (A) (iii) & (iv) (B) (i) & (iii) (C) (ii) & (i) (D) (iv) & (ii)

8


47. Rainwater harvesting is an important method for _____. (A) Treating sewage water (B) Recycling water from factories (C) Raising ground water level (D) Industrial purposes. 48. Which of the following does not happen during exhalation ? (A) The space in chest cavity decreases (B) Diaphragm goes up (C) Air is released (D) Ribs are pushed upward and outward. 49.

What is peculiar about pulmonary artery and pulmonary vein ? (A) Pulmonary artery carries carbon dioxide-rich blood and pulmonary vein carries oxygen-rich blood. (B) Pulmonary artery carries oxygen-rich blood and pulmonary vein carries carbon dioxide-rich blood. (C) Both pulmonary artery and vein carry carbon dioxide-rich blood from the heart to the lungs. (D) Both pulmonary artery and vein carry oxygen-rich blood from the lungs to the heart.

50.

Refer the given figure. What are X and Y and what do they grow into ? (A) X-Radicle and Y-Plumule; both grow into roots. (B) X-Plumule and Y-Radicle; both grow into shoot and leaves. (C) X-Radicle, grows into roots; Y-Plumule, grows into shoot and leaves. (D) X-Plumule, grows into shoot and leaves; Y-Radicle, grows into roots. SPACE FOR ROUGH WORK

X

Y

Class 7 15th

SET A Year 2012

2

15th NSO - SET A

MENTAL ABILITY 1.

Fill in the blank :

The line segment joining a vertex of a triangle to the mid-point of its opposite side is called a

______ of the triangle. (A) Altitude

2.

Which of the following solids is made of the greatest number of unit cubes ?

(A)

3.

A freezing process requires the room temperature to be lowered from 40°C at the rate of 8°C every

hour. The room temperature 4 hours after the process begins is _______. (A) –8°C (B) 8°C (C) 72°C (D) –72°C

4.

What is the smallest number of squares that must be added so that the line

AB becomes a line of symmetry? (A) 5 (B) 4 (C) 2 (D) 3

5.

The entrance charges for a resort are shown in the given table.

Mr. Rajiv drove to the resort with his wife Radhika

(B) Median

(B)

(C) Hypotenuse

and three children on Saturday at 1.30 pm. They left the resort at 8 p.m on the same day. How much

(C)

(D) None of these

(D)

Entrance Fee

` 200 per car

Monday to Friday

` 75.50 per passenger

Saturday and Sunday

` 110.50 per passenger

Parking charges

` 40.50 per hour

did Mr. Rajiv and his family have to pay in all ? (A) ` 1015.75 (B) ` 1076.50

6.

Find the missing figure in the given series ?

(A)

7.

Megha's salary in September was ` 18,000. Her salary in October was ` 16,000. What was the

percentage decrease in her salary? (A) 12.5 % (B) 8.8 %

8.

Mohit borrowed ` 12,000 from his friend. He gave ` 2000 at 18% and the remaining amount at 15%.

How much interest did he pay in 3 years? (A) ` 5580 (B) ` 8550

9.

If the code of RIGHT is SGJDY, what is UPDZJ the code for? (A) VERSE (B) VALID (C) TRAIN

(B)

(C) ` 815.50

(D) ` 1036

(C)

(D)

(C) 11.11 %

(C) ` 5508

(D) 7.5 %

(D) ` 5055 (D) TRADE

3

15th NSO - SET A

10. Beena bought

7

m of cloth. She used

8 How much cloth did she have left? 1 7 (B) (A) m m 8 36

2 3

m to sew a dress and

(C)

5 72

1 3

m of the remainder for a skirt.

m

11. Amit, Priya, Latika, Garima and Rahul all go into a shop. l Only Garima buys a samosa. l Priya, Latika and Rahul buy a chocolate each. l Everyone except Priya buys an ice cream each. l Priya is the only one who buys toffees. l Nobody except Amit and Latika chooses a burger. l Each of the girls buy a packet of chips. Which child buys the most number of items? (A) Priya (B) Garima (C) Latika

(D)

5 36

m

(D) Amit

12. In the given figure, PQ = PR and S is the midpoint of QR. Then

DPSQ @ DPSR by ________ congruence. (A) SAS (C) Both (A) and (B)

(B) SSS (D) None of these

13. What is the average number of ribbons made by the 5 girls ?

(A) 42

(B) 50

(C) 45

(D) 48

14. Which of the following conditions is INCORRECT on the basis of the given figure, where l || m?

(A) ∠3 + ∠5 = 180°

(B) ∠3 =∠6

(C) ∠2 = ∠6

(D) ∠1 + ∠4 = 180°

15. Rohan is 12 years older than Kareena. After four years, Rohan's age will be equal to thrice the age of Kareena. Find the present age of Rohan. (A) 2 years (B) 12 years (C) 14 years (D) 4 years

science 16. The warm water is poured slowly into a beaker of ice cubes as shown in figure. Which of the following options is correct, when the warm water was poured into the beaker ? 1. The ice starts to melt. 2. The glass expands. 3. The temperature of the ice increases 4. The temperature of the warm water decreases. (A) 1 and 4 only (B) 2 and 4 only (C) 1, 3 and 4 only

(D) All of these

17. In which direction does the frictional force always act on an object moving across a horizontal surface ? (A) In the direction of the gravitational force (B) Opposite to the direction of the gravitational force (C) In the direction of motion (D) Opposite to the direction of motion

15th NSO - SET A

4

18. The graph shows the first few seconds of a car's journey.

From the graph it can be seen that the car travels (A) At increasing speed and then stops (B) At constant speed and then slows down (C) With constant acceleration and then at constant speed (D) With constant acceleration and then stops

19. In the game of basketball, the ball is bounced (with no spin) towards a player at an angle of

40 degrees to the normal. What will be the angle of reflection? (A) 30° (B) 45° (C) 60°

(D) 40°

20. How does cyclone decrease the fertility of the soil in the coastal areas? (A) By flooding the land with saline water (B) By dissolving soil and rocks (C) By increasing the water table of the place (D) By decreasing the water table of the place 21.

In the figure Y, magnet P is experiencing ________.

1. Magnetic force of repulsion 3. Elastic spring force (A) 1 and 3 only (B) 1 and 4 only

2. Magnetic force of attraction 4. Gravity (C) 2 and 3 only (D) 2 and 4 only

22. The temperature shown by a mercury-in-glass thermometer increases. Which of the following is

constant? (A) Density of the mercury (C) Mass of the mercury

23.

When an electron moves from negative electrode to positive electrode, (A) Negative charge moves from negative electrode to positive electrode (B) Positive charge moves from positive electrode to negative electrode (C) No charge flows from either electrode to other electrode (D) Both (A) and (B)

(B) Internal energy of the mercury (D) Volume of the mercury

24. Which of the following is not caused by friction or resistive forces? (A) A match lightning as it strikes a match box. (B) A car braking to a stop. (C) A pebble accelerating as it falls to the ground. (D) A meteor glowing as it falls through the atmosphere. 25. The average velocity of a body is equal to mean of its initial velocity and final velocity. The

acceleration of the body is (A) Variable (B) Zero

(C) Negative

(D) Uniform

26. A reaction is carried out in a test tube as shown in figure. A gas comes out

with hissing sound and bubbles. Which of the given test will confirm the presence of the gas which comes out? (A) Bring a burning splinter near the mouth of the gas tube, it burns brightly. (B) Pass the gas into lime water, it turns milky.

(C) Pass the gas in red litmus solution, it turns blue.

(D) Pass the gas into copper sulphate solution, it turns green.

5

15th NSO - SET A

27. Shuchi conducted an experiment to find the amount of light that could pass through four different materials. She recorded her results in the table below.

Material

Amount of light (lux)

P

30

Q

120

R

0

S

60

Which of the above material is most suitable for making the lens of the magnifying glass?

(A) P

(B) Q

(C) R

(D) S

28. The table below shows the colours and solubilities of four solids in water.

Solid

Colour

Solubility in water

W

Blue

Insoluble

X

Blue

Soluble

Y

White

Insoluble

Z

White

Soluble

A mixture containing two solids is added to excess water, stirred and filtered. A blue filtrate and a white residue are obtained. Which two solids are present in the mixture? (A) W and X (B) W and Y (C) X and Y (D) X and Z

29. Five solutions have been taken in five test tubes labelled as A, B, C, D and E. They are tested with four indicators and the observations are recorded.

Solution

Methyl Orange

Blue litmus

Red litmus

Phenolphthalein

A

Red

Red

Red

Colourless

B

Red

Red

Red

Colourless

C

Yellow

Blue

Blue

Pink

D

Orange

Blue

Red

Colourless

E

Red

Red

Red

Colourless

Which of the above solutions can neutralise each other? (A) A and B (B) D and E (C) B and C

(D) B and D

30. Some blobs of wax are placed on a silver ring as shown in the diagram. If the ring is heated at X, then choose the correct option regarding the melting of wax because of heating. (A) Only R blob melts. (B) Blobs R, S and Q melt together. (C) Melting of blobs occurs in the order R, Q, S and P. (D) P, Q, R and S blobs melt together. 31. Reena prepared China rose indicator by keeping the petals of the flower in hot water for some time. She used the coloured solution for testing three solutions A, B and C. Solution A turns to dark pink, solution B remains light pink and solution C turns to green. Mark the correct option. Solution A Solution B Solution C

(A) Lemon juice

Sugar solution

Milk of magnesia

(B) Lemon juice

Orange juice

Sugar solution

(C) Orange juice

Vinegar

Salt solution

(D) Salt solution

Milk of magnesia

Lemon juice

15th NSO - SET A

6

32. The given flow chart is used to show some similarities and differences among four objects P, Q, R and S. One of the objects is a copper coin.

Identify the copper coin from the given information.

(A) P

(B) Q

(C) R

(D) S

33. The given diagram shows a covered cup of hot chocolate. After some time, most of the heat from the hot chocolate is lost to the surroundings through the _________. (A) Steel lid (B) Marble tile (C) Foam cup

(D) Wooden table

34. Observe the given Venn diagram. What does X and Y show ?

(A) X - Jute, Y - Flax

(B) X - Flax, Y - Jute

(C) X - Jute, Y - Cotton

(D) X - Cotton, Y - Jute

35. Priya wants to test presence of proteins in some food items. She took a cup of milk, some groundnuts and a raw potato. She made a paste of raw potato and powder of groundnuts by mashing and grinding them. She put equal quantities of three food items in three different test tubes and added, using a dropper ten drops of water, two drops of copper sulphate solution and ten drops of caustic soda solution to each test tube. She shook well all the three test tubes and let them stand for a few minutes. What result would she get for the test she performed ? [(+) indicates violet colour] Potato Groundnuts Milk (A) +++ ++++ + (B) ++++ – ++ (C) – + ++++ (D) + +++ – 36. Read the given activity. What would you most

Activity

likely observe for the plant and why ?

Take a potted plant. Put it in a cardboard box

(A) The plant would bend towards the hole because it has to exchange gases through hole.

and close the box. Make a hole on one side of

the cardboard box in such a way that light enters

only through this hole. Keep watering the plant (B) The plant would grow upright inside the box because it regularly for a few days. is getting all the essential requirements for growth. (C) The plant would grow upright inside the box because it is not getting direct sunlight. (D) The plant would bend towards the hole because plant responds to light.

7

15th NSO - SET A

37. Arpita took a strip of blotting paper of 3 cm × 5 cm and clipped one half on the upper surface and the other half on the lower surface of a leaf. What would she most likely observe after one hour ? (A) Blotting paper clipped on the upper surface is more wet. (B) Blotting paper clipped on the lower surface is more wet. (C) Blotting paper is equally wet on both the surfaces of the leaf. (D) The observation cannot be predicted. 38. Leaves may be simple or compound. Which of the

given figures can be called as compound leaves? (A) (a) only (B) (b), (c) and (d) (C) (a) and (d) (D) All of these

39.

Which among the following is an odd one ? (A) Desert : Stems store water (B) Pond : Animals with streamlined bodies (C) High altitude : Increase in RBC (D) Rainforests : Camouflage to escape from enemies

40. Which of the following encloses the portion of your body below the stomach ?

(A)

(B)

(C)

(D)

41. Charkha is used for ______.

(A) Spinning

(B) Ginning

42.

"Fats are stored beneath the skin and around the heart and kidneys". It is because _______. (A) When we are short of energy, our body uses stored fats (B) The stored fats in our body help to keep us warm (C) Fats act as shock absorber and protect internal organs from injury (D) All of these

43. Select the correct pair. (A) Spinach – Leaves (C) Cauliflower – Roots

(C) Weaving

(B) Carrot – (D) Onion –

(D) Knitting

Stem Flowers

44. The function of scissors is synonymous with the function of _____. (A) Incisors (B) Premolars (C) Canines 45. Match Column-I with Column-II and select Column-I Column-II (a) Salivary gland (i) Breaks down (b) Intestinal gland (ii) Breaks down (c) Pancreas (iii) Breaks down (d) Liver (iv) Breaks down (A) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

(C) (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

(D) Molars

the correct option from the codes given below. fats proteins into peptides peptides into amino acids starch into sugar (B) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv) (D) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)

46.2 Which of the following is incorrect regarding exhalation process in breathing mechanism ? (A) Air moves out. (B) Diaphragm relaxes. (C) Chest cavity becomes smaller. (D) External intercostal muscles contract.

8

15th NSO - SET A

47.2 Garima took a plant and placed it in the dark for 24 hours to de-starch its leaves. After that she performed an activity as shown here.

(i) She put one leaf (marked as X) in clean plastic bag containing soda lime and another leaf (marked as Y) in a clean plastic bag containing water. Then she left the plant

in sunlight for 6 hours. (ii) She took out the leaves and boiled them in alcohol. (iii) She performed the iodine test on the leaves. Select the option with correct iodine test results and the conclusions of the activity. Leaf Y CO2 is necessary Leaf X CO2 is necessary (Iodine test) for photosynthesis (Iodine test) for photosynthesis (A)  Yes  No (B)  Yes  Yes (C)  No  Yes (D)  No  No

48.

'Silk has come under fire from animal rights activists'. Why ? (A) Because female silkmoth is reared to lay hundreds of eggs at a time. (B) It takes approximately 630 cocoons to make a silk blouse. (C) Cocoons are collected and put into very hot water, killing the silkworm inside them. (D) After hatching, the silkworms are fed on mulberry leaves continuously for six weeks.

49. Sandeep has three soil samples X, Y and Z, each with weight 50 g. 100 mL of water is poured drop by drop with the help of a dropper on all the soil samples. The given graph shows weight of water absorbed by each soil sample. Select the correct option regarding the soil samples. (A) X is a mixture of sand, silt and a good amount of clay. (B) Y is a mixture of sand, silt and appropriate amount of clay. (C) Z is a sandy soil with very little clay. (D) Z is a mixture of clay and silt with higher amount of sand. 50. The given figure shows _____.

(A) Seed dispersal carried out by explosion

(B) Seed dispersal carried out by wind

(C) Seed dispersal carried out by insect

(D) Seed dispersal carried out by sunlight SPACE FOR ROUGH WORK

Class 7 15th

SET B Year 2012

15th NSO - SET B

1

MENTAL ABILITY 1.

Which of the following statements is INCORRECT? (A) All integers and fractions are called rational numbers. (B) The number 0 is neither a positive nor a negative rational number. (C) There are limited number of rational numbers between two rational numbers. p (D) A number that can be expressed in the form , where p and q are integers and q ≠ 0 is called a rational q number.

2.

Aman rotated a game piece 270° clockwise around vertex V. Which of

the following represents the position of the game piece after the 270° clockwise rotation?

(A)

(B)

(C)

(D)

3.

Lengths of some world's longest snakes are 9, 9, 4.3, 6, 6.5, 2.6, 5.6, 9. The range, in metres, of the lengths is _____. (A) 6.25 (B) 6.4 (C) 6.5

(D) 9

4.

Solve for x : x + 3 − x + 4 = x + 5 − x + 6 4 5 6 7 (A) –1 (B) 1

(D) 2

5.

Amit, Raj, Kunal, Harsh and Armaan used different types of transport during the holidays. I. Everyone except Harsh travelled on the bus. II. Kunal, Harsh and Armaan all went on an aeroplane. III. Everyone except Raj went in a taxi. IV. Amit and Harsh both had a ride on a tram. V. Raj travelled on a bus and then a train to get to his holiday destination. Who used the fewest types of transport during the holidays? (A) Amit (B) Raj (C) Harsh (D) Armaan

6.

The least number which when increased by 5 is divisible by each one of 24, 32, 36 and 54, is ____. (A) 427 (B) 859 (C) 869 (D) 4320

7.

The given table shows a relationship between x and y.

The (A) (B) (C) (D)

8.

The records of a sporting goods company shows that 4 out of every 100 footballs manufactured have some defect. The probability of drawing a football that will NOT have a manufacturing defect is ______. 1 1 1 24 (B) (C) (D) (A) 25 1 4 25

9.

(C) 0

equation which is true for each of the ordered pairs in the table is ____. y = 3x + 2 y = 2.5x + 6 y = 3.5x + 2 y = 3x + 6

x 0 2 4 6 8

y 2 9 16 23 30

60% of the population of city were men and the rests were women. Afterwards, 840 men left the city and 1000 women came to the city. As a result, the percentage of the men reduced to 56% of the population. The present population of the city is _____. (A) 23420 (B) 24300 (C) 23240 (D) 23400

15th NSO - SET B

2

10. In the problem set, given below three figures are similar in a certain manner. However, one figure is not like the other three. Choose the figure which is different from the rest.

(A)

(B)

(C)

(D)

3 11. In what time will the interest on a certain sum of money become   8 of 6% p.a. simple interest? (A) 5 years (B) 10 years (C) 8 years 1 1 4 − 4 + 2.8 + − 2.32 = 5.33 , then x is _____. 4 5 x (A) 0.05 (B) 0.5

th

of the amount at the rate (D) 6 years

12. If 8

(C) 5

(D) None of these

13. Select the figure which is embedded in the given figure (X).

(A)

(B)

(C)

(D)

14. Which of the following numbers is divisible by 9? (A) 823519 (B) 270351 (C) 612593

(D) 759803

15. The elevator descends into a mineshaft at the rate of 8 m/min. If the descent starts from 20 m

above the ground level, the time taken by the elevator to reach – 300 m is _____. (A) 30 mins (B) 40 mins (C) 50 mins (D) 1 hr

SCIENCE 16. A switch is used to turn an appliance on and off. Which is the safest position for the switch ? (A) On the live wire (B) On the neutral wire (C) On the heating element (D) On the earth wire 17. Match the Column-I with Column-II and select the correct option from the codes given below.

(a) (b) (c) (A)

Column-I Body moving with uniform speed (i) Body moving with non-uniform speed (ii) When a body is at rest (iii) (a)-(iii), (b)-(ii), (c)-(i) (B) (a)-(i), (b)-(iii), (c)-(ii) (C)

Column-II Straight line parallel to the time axis A curve having increasing slope. Straight line inclined to the axis. (a)-(ii), (b)-(i), (c)-(iii) (D) (a)-(i), (b)-(ii), (c)-(iiii)

18. When Beena compresses the spring as shown in figure, which of the following occur?

(i) Her hand exerts a pushing force (iii) The spring exerts a pushing force (A) (i) and (iii) only (B) (i) and (iv) only

(ii) Her hand exerts a pulling force (iv) The spring exerts a pulling force (C) (ii) and (iii) only (D) (ii) and (iv) only

15th NSO - SET B

3

19. If a pin is placed in front of, and to the right of a plane mirror as

P

Q

shown in figure. Where is the image of the pin formed?

(A) P

(B) Q

(C) R

(D) S

R

S Pin Observer

20. Study the distance-time graph of a toy car, given in the figure

and choose the incorrect statement from the following.

(A) The toy car is fastest during first 10 seconds.

(B) The toy car is slowest in between 10 and 20 seconds.

(C) Distance travelled during last 10 seconds is 5 m.

(D) None of these

21. Bulb does not glow when the probs are hanged in air. The reason is _______. (A) Air absorbs the electricity (B) Air is a bad conductor of electricity (C) Electricity is discharged into air (D) Air disperses the electricity 22. Which of the following cannot be turned into a magnet ? (A) Copper coil (B) Steel bar (C) Iron bar

(D) Nickel disc

23. What conclusions do you draw about the nature of motion of an object

from the given velocity-time graph s ? (A) In graph (a) object is moving with retardation and in graph (b) object is moving with constant acceleration. (B) In graph (a) object is moving with retardation and in graph (b) object is moving with variable acceleration. (C) In graph (a) object is moving with positive acceleration and in graph (b) object is moving with variable acceleration. (D) In graph (a) object is moving with positive acceleration and in graph (b) object is moving with constant acceleration.

24. Mohan takes 15 minutes to go from his home to school and 30 minutes for the return journey. If

the distance between the school and the home is 4.5 km, what is his average velocity? (C) 4 m s–1 (D) 3 m s–1 (A) 0 (B) 5 m s–1

25. The factor which contribute to the development of cyclones is/are

(i) Wind speed (A) (i) only

(ii) Temperature (B) (ii) and (iii) only

(iii) Humidity (C) (i) and (iiii) only

26. Four rods of equal length and thickness but of different materials are coated with wax in the same manner. They are fixed to a trough containing hot water. The given diagram illustrates what happens to the wax on each rod after five minutes.

(D) All of these

Hot water

Metal trough

Aluminium rod Brass rod Copper rod Glass rod Wax coating on rod

What can you conclude from the given diagram? (i) Aluminium rod can conduct heat better than the brass rod. (ii) The aluminium rod conducts heat better than the copper rod. (iii) The glass rod conducts heat better than the copper rod. (iv) The wax on the copper rod melts faster than the wax on the brass rod. (A) (i) and (iv) only (B) (ii) and (iii) only (C) (i), (ii) and (iii) only (D) (ii), (iii) and (iv) only

15th NSO - SET B

4

27. Which of the following diagram(s) represents alkalis and bases in the correct form?

(A) (i) only

(B) (iii) only

(C) (i) and (iv)

(D) (iii) and (iv)

28. The given diagram shows a bimetallic strip made of brass and steel. It is clamped at its centre. The bimetallic strip is heated. Which one of the following shows the strip after it has been heated ?

Note : Brass expands more than steel upon heating.

(A)

(B)

(C)

(D)

29. A metallic piece (X) is dropped into copper

sulphate solution. After some time, the blue colour of the solution changes to green which shows a chemical change has taken place. Which metal has been dropped into the solution and what is the name

of the new substance formed? (A) Metal X is iron and the substance formed is ferrous sulphate. (B) Metal X is silver and the substance formed is silver sulphate. (C) Metal X is zinc and the substance formed is zinc sulphate. (D) Metal X is magnesium and the substance formed is magnesium sulphate.

30. How will you identify the given solutions if you are provided

with only one indicator-methyl orange?

(A) The solutions can not be identified by the help of methyl orange

31.

only. (B) Methyl orange changes to red in both acidic and neutral solutions and yellow in basic solution. (C) Methyl orange remains orange in acidic solution while changes to yellow in basic and neutral solution. (D) Methyl orange changes to red in acidic solution, yellow in basic solution and remains orange in neutral solution. Study the given Venn diagram. Which group does copper belong to? (A) P (B) Q (C) R (D) S

32. Beena performed an experiment in which she took four beakers containing different amount of water at different temperatures. She added equal amount of salt into each beaker.

Identify the beaker in which salt takes the shortest time to dissolve. (A) Beaker 1 (B) Beaker 2 (C) Beaker 3

(D) Beaker 4

15th NSO - SET B

5

33. The table below shows some properties of four different substances easily available in the kitchen. They are mixed together in a bowl. Substance Colour Dissolves in water Passes through fine sieve W Green No No X

White

No

No

Y White Yes No Z White Yes Yes Which of the following is the best way to separate the substances? (A) Pour water into the bowl and remove W and X. (B) Pick out the green substance and pour water into the remaining mixture. (C) Pick out the green substance to get W, pour water into the bowl to get X and heat remaining solution to get Y. (D) Pick out the green substance, put the remaining mixture into a sieve to get Z, pour water over the remaining substances in the bowl to filter X and heat the remaining solution to get Y.

34. Match Column-I with Column-II and select the correct option from the codes given below. Column-I Column-II (a) Papier maché (i) Non-biodegradable (b) Burning of wastes (ii) Vermicomposting (c) Plastic (iii) Waste management (d) Decomposing wastes using earthworm (iv) Biodegradable (e) Vegetable peels (v) Incineration. (A) (a)-(v), (b)-(iii), c-(i), (d)-(ii), (e)-(iv) (B) (a)-(iii), (b)-(v), c-(i), (d)-(ii), (e)-(iv) (C) (a)-(ii), (b)-(iii), c-(iv), (d)-(v), (e)-(i) (D) (a)-(i), (b)-(ii), c-(iv), (d)-(v), (e)-(iii) 35. Three species of fishes X, Y and Z with different body patterns are found in a lake. A predator who feeds on all the three fishes X, Y and Z, is introduced into the river. Which of these fishes will be least affected? (A) Fish Z because it lives near the ground. (B) Fish Y because it shows camouflage. (C) Fish X because it lives near surface. (D) All the three fishes will be equally affected.

– – – – – – – – – –

– – – – – – – – – –

– – – – – – – – – –

– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

X Y Z

Aquatic weeds

36. Select the option which on reshuffling gives the term used for the process of separating jute fibres. (A) GGNINI (B) GCRDIAN (C) GINIPNNS (D) GETINTR 37. Saurabh's younger brother Harshit is 3 years old. He is having difficulty in walking due to deformity in his legs as shown. He always complains about body pain. Which of the following can be the reason for it? (A) His diet is deficient in vitamin C and K due to which his body absorbs excess amount of calcium and phosphorus present in food. (B) His diet is deficient in vitamin D due to which his body is not able to absorb sufficient amount of calcium and phosphorus present in food. (C) Major part of his diet is milk and green vegetables. (D) None of these 38. Which of the following joints allows the maximum freedom of movement? (A) Hinge joint (B) Gliding joint (C) Saddle joint (D) Ball and socket joint 39.

Earthworms are generally seen wriggling above the ground during heavy rains, because they (A) Cannot tolerate dry environment and come out of hibernation only when it is raining. (B) Do not intake water so they come out to absorb as much water as possible and conserve it. (C) Respire air present between soil particles which is replaced by water during rain, hence earthworms come out to get air. (D) Both (A) and (C)

15th NSO - SET B 40.

6

Read the given statements. (i) Air dissolved in water cannot be removed from it. (ii) Density of air decreases with increasing altitude. (iii) Air is an element that surrounds the earth and makes earth hospitable for living organisms. (iv) Air helps in pollination of several flowers and in the dispersal of seeds. Which of the above statements are correct? (A) (i) and (ii) (B) (ii) and (iv) (C) (i) and (iii) (D) (iii) and (iv)

41. For survival of a plant it is essential that all its parts get the following substances: P - Carbon dioxide

Q - Oxygen

R - Sugar

S - Water

Which of these substances is transported along the pathway shown in the figure? (A) P and Q (B) Q and R (C) Q, R and S

(D) P, Q and R

42. Read the given statements and select the correct option. Statement 1 : Plants serve as the ultimate food source for all the organisms whether herbivores or carnivores. Statement 2 : Plants use solar energy to prepare their own food. (A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. (B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. (C) Statement 1 is true but statement 2 is false. (D) Both statements 1 and 2 are false. 43. Read the given statements. (a) Carnivores are called ______ consumers because they get their food ______ from plants. (b) Fungi and other microorganisms feed on dead matter and ______ the nutrients into soil through process called ______. (c) Organisms living in very cold environment have deposition of ______ under their skin and are of ______ size. (d) In submerged aquatic plants, stomata are generally ______ and roots are ______ developed. Select the option which correctly fills the blanks in any two of these statements. (A) (a) - Primary, Directly; (c) - Fat, Large (B) (b) - Release, Decomposition; (c) - Carbohydrates, Large (C) (a) - Secondary, Indirectly; (d) - Absent, Less (D) (b) - Release, Decomposition; (d) - Present, Much 44. Refer the given Venn diagram and select the correct option.

(A) P - Man

(B) Q - Earthworm

(C) R - Cockroach

(D) P - Frog

45. Surabhi is practising hard to win the inter-school marathon. One day her instructor measured and recorded the number of her heart beats during her training session in which she did some warm up exercises and her run. He plotted his recordings in the graph as shown. Select the correct option regarding this. (A) 'a' is the point when she started warm up exercises. (B) 'b' is the point when she started running. (C) 'c' is the point when she started running. (D) 'd' is the point when she stopped running.

15th NSO - SET B 46.

7

Which of the following is correct about excretion in plants? (A) Production of rubber, resin, etc., is a means of excretion for plants. (B) Transpiration helps plants to get rid of excess water. (C) Withering leaves accumulate excretory wastes. (D) All of these

47. A fertile agricultural soil appears dark coloured at the surface as compared to soil one metre down. The reason for dark colour of top soil is (A) More moisture (B) Rich inorganic matter and abundance of minerals (C) Rich organic matter (D) Recent soil formation 48. Read the given statements and select the correct option. Statement 1 : Forests prevent soil erosion. Statement 2 : Canopy formed by crown of leaves of forest trees reduces the force and speed of raindrops. (A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1 (B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. (C) Statement 1 is true but statement 2 is false. (D) Both statements 1 and 2 are false. 49. Anushka bagged four different kinds of flowers on the potted plants as represented by given figure and left them as such. Which of these four flowers is most likely to produce fruits and seeds?

(A)

(B)

(C)

(D)

50. Tanmay took a potted plant and covered one of its leaves entirely with black paper and marked it as X and left the plant Leaf Y in sunlight for 6 hours. After 6 hours, he plucked three leaves X, Y and Z. He immersed leaves X and Z immediately in water but smeared leaf Y with petroleum jelly prior to immersion. Leaf Z Bubbles were seen on the surfaces of leaves X, Y and not on Black leaf Z. Which of the following is most likely the reason for it? paper (A) Bubbles on leaf Z are of oxygen, produced in photosynthesis. Leaf X (B) Bubbles on leaf X are of carbon dioxide, produced in respiration. (C) Stomata on leaf Y are blocked with petroleum layer, thus oxygen cannot come out from leaf. (D) All of these SPACE FOR ROUGH WORK

Class 7 16th

SET A Year 2013

Mental Ability 1.

2.

Which property holds in the given below statement? a × (b + c) = (a × b) + (a × c) A. Property of division B. Multiplicative identity of multiplication C. Distributive property of multiplication distributes over addition D. Distributive property of addition distributes over multiplication ABCD is a rectangle, E is the mid-point of AB and F is the mid-point of DC. What percentage of the rectangle is unshaded? A. B. C. D.

50% 25% 15% 75%

3. Select the correct match. Solid

A.

Net

B.

6.

On which number line dark portion represents the sum 3 + 1 . 8 2

A.

C.

D.

7.

Select the wrong step in the simplification of 24 – [2.4 – {0.24 × 2 – (0.024 – x)}] = 22.0584 (i) 24 – [2.4 – {0.24 × 2 – (0.024 – x)}] = 22.0584 (ii) 24 – [2.4 – {0.48 – 0.024 – x}] = 22.0584 (iii) 24 – [2.4 – 0.456 – x] = 22.0584 (iv) 24 – 1.944 + x = 22.0584 (v) x = 22.0584 – 22.056 = 0.0024 A. Both (ii) and (iii) B. Only (ii) C. Only (v) D. Both (iii) and (iv)

8.

The given table shows the weights of some marbles.

B.

Marbles

Weight in grams

C.

D.

4.

Find the value of (21001 – 21000) ÷ (2501 – 2500).

A. B. C. D.

5.

In the given figure (not drawn to scale), ABCD is a parallelogram and GBEF is a rectangle. Find x – y. A. 7° B. 8° C. 6° D. 9°

A

A

B

500

B

A

400

What is the average weight of marbles A and B? A. 450 grams B. 150 grams C. 300 grams D. 600 grams

9.

Which is the missing figure?

A.

B.

C.

D.

22000 2500 21000 2200

B

10. What is the missing number?

A.

36

B.

125

C.

343

D.

512

16th NSO - SET A

2

11. A cube has faces numbered 1, 2, 3, 4, 5 and 6. The numbers on the opposite faces of the cube add up to 7. The net of the cube is shown below. The numbers on 3 faces are not shown. Find the number on the face indicated by the ‘?’

A. B. C. D.

6 4 2 5

13. The clock shows 9 O' clock. What time will it 3 show, if the hour hand makes a - turn in the 4 anti-clockwise direction and minute hand do not change its position? A. 12 : 15 B. 12 : 00 C. 3 : 00 D. 3 : 15 and

14. 12. Select the correct mirror image of given below figure (X).

× value of

A.

B.

C.

D.

A. C.

are

whole

numbers

and

= 48. What is the smallest possible +

20 14

? B. D.

12 16

15. When two lines intersect each other at a common point, this common point is called the ______. But when three or more lines pass through a single common point, then this point is called the ______ of the lines. A. Point of concurrency, same point B. Unique point, point of concurrency C. Point of intersection of the lines, point of concurrency D. Point of intersection of the lines, point of collinearity

Science 16. An object start moving in a circular path of radius R, from point A. The magnitude of displacement of the object, when it reaches point B is pR

A.

B.

2R

C.

2 πR

D.

A O

R

B

πR 2

17. A battery lights up all the four lamps as shown in figure. When one of the lamp filament melts, the other three lamps stay on. Which of the following lamp filaments melt?

A.

P

B.

Q

C.

R

D.

S

P R

18. The hot liquid is poured into a test tube. The figure shows how the temperature of the contents of the test tube changes with time what is the physical state of the contents of the tube at time 8 minute?

A.

B.

C. D.

19. The less A. B.

Q S

Mixture of liquid and vapour Mixture of liquid and solid Liquid Solid

images of clouds and trees in water are always bright than in reality, it is because Water is making the image dirty. There is an optical illusion due to which the image appears to be less bright. C. Only a portion of the incident light is reflected and quite a large portion goes mid water. D. Air above the surface of water contains a lot of moisture.

16th NSO - SET A

3

20. Three bulbs X, Y and Z are connected in a circuit as shown in figure. When the switch is put on, then

A. B. C.

D.

All the bulbs will glow at the same time Bulbs will glow in the order of X, Y and Z Bulb X will glow first whereas bulbs Y and Z will glow simultaneously after some time Bulb Z will glow first

21. Following are the precautions one must take in the case a storm is accompanied by lightning. Which one of the following statements is not correct? A. Do not take shelter under a tall tree. B. Do not take shelter inside a closed car. C. Do not take shelter under an umbrella. D. Do not take shelter under an open garage. 22. A pendulum is oscillating as shown in the figure. If it takes 0.4 s to swing from A to B, then how long will it take to make 5 oscillations ?

A.

1.6 s

B.

3.2 s

C.

8.0 s

D.

A

4.2 s

B

24. Which of the following speed-time graphs represents the case of a body first decelerating then moving with a constant speed and finally accelerating ? A.

B.

C.

D.

25. Ranjana was given three unknown solutions P, Q and R. She performed certain tests and observed the following: Solution P → gives green colour with China rose indicator. Solution Q → phenolphthalein remains colourless. Solution R + sugar solution → turns methyl orange to yellow. Identify the solutions P, Q and R respectively. A. Orange juice, Salt solution, Baking soda B. Soap solution, Lime water, Lemon juice C. Soda water, Vinegar solution, Shampoo D. Salt solution, Milk of magnesia, Antacid

26. Methods of separation depend on the nature of the constituents in a mixture. Study the methods of separation as given below. Types of mixture

C

23. Match the column I with column II. Column I Column II (a) Convex mirror (i) used as magnifying glass (b) Convex lens (ii) used as side view mirror in vehicles (c) Concave mirror (iii) image is erect and smaller than object (d) Concave lens (iv) used by dentists to see enlarged image A. a-(i), b-(iii), c-(iv), d-(ii) B. a-(iv), b-(ii), c-(iii), d-(i) C. a-(ii), b-(i), c-(iv), d-(iii) D. a-(iii), b-(iv), c-(ii), d-(i)

Methods of separation

1. Solid - Solid

Handpicking, Sieving

2. Solid - Liquid (insoluble)

Sedimentation, Decantation, Filtration

3. Liquid - Liquid (immiscible)

Decantation, Separating funnel

4. Solid - Liquid (soluble)

Filtration, Decantation

5. Liquid - Liquid (miscible)

Distillation

Which of these is incorrect method of separation? A. 1 and 2 B. 5 C. 1 and 5 D. 4

27. Ankit, Sahil and Manish living in different parts of the country bought new bicycles on the same day. Ankit lives near sea coast. Sahil lives in a city with cool and moist climate whereas Manish lives near desert. After two years, whose bicycle will be in the worst condition due to rusting? A. Ankit B. Sahil C. Manish D. Ankit and Manish

16th NSO - SET A 28. Rishab was performing an experiment with a blue coloured solution (X ) in a beaker. By mistake a shaving blade fell into the beaker. After half an hour, he found that the colour of the solution in beaker changed to green (Y ). What could be the solutions X and Y respectively?

A. B. C. D.

Copper sulphate, Iron sulphate Iron sulphate, Copper sulphate Iron sulphate, Zinc sulphate Copper sulphate, Zinc sulphate

29. Each cell in our body contains a/an ______ the DNA, which controls every feature of the body such as our looks, complexion, etc. Proteins that build part of our cells are made of _______. The fats in our body contain _______. A. Neutral, bases, acids B. Acid, amino acids, fatty acids C. Base, nutrients, neutral substances D. Amino acid, zinc carbonate, formic acid 30. Study the given figures carefully.

What type of changes occurred in the wire?

A.

B.

C. D.

I is a chemical change while II is a physical change. I is a physical change while II is a chemical change. Both I and II are physical changes. Both I and II are chemical changes.

31. Four students P, Q, R and S have to dissolve maximum amount of sugar in the same amount of water so as to win in a game. P : Took hot boiling water. Q : Took ice cold water. R : Added more water on dissolving sugar in hot water.

4

S : Took ice cold water and added more water. Whom do you think would win the game? A. P B. Q C. R D. S

32. Consider the following four adaptations and select the ones required for animals to survive in tropical rain-forests. (i) Living on the trees, development of strong tails. (ii) Burrowing in soil to escape high temperature. (iii) Sensitive hearing, sharp eyesight, thick skin, ability to camouflage. (iv) Bask in Sun when temperature is low. A. (i) and (iv) B. (ii) and (iv) C. (i) and (iii) D. (ii) and (iii) 33. Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort? A. The lungs can be made fully empty by forcefully breathing out all air from them. B. One can breathe out air through Eustachian tube by closing both nose and mouth. C. One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all. D. One can breathe out air totally without oxygen. 34. Root hairs are most important to a plant because they _________. A. Anchor a plant to the soil B. Provide a habitat for N 2 fixing bacteria C. Increase the surface area for absorption D. Contain xylem tissue. 35. When domestic sewage mixes with river water ______. A. Small animals like rats will die after drinking river water. B. T h e p o p u l a t i o n o f m i c r o b e s i n c r e a s e s and concentration of dissolved oxygen decreases. C. The river water is still suitable for drinking as impurities are only about 0.1%.

D.

The increased microbial activity releases micronutrients such as iron.

16th NSO - SET A

5

36. The given figures show two kinds of fruits :

How are ‘X’ and ’Y’ adapted for their dispersal in the surroundings? X Y A. Fleshy and sweet Hair-like structure to stick onto bodies of animals B. Able to float Hook-like structure to on water stick onto fur of animals C. Air trapped Dry seeds within its structure D. Wing-like Hair-like structure to get structure blown off with the wind

P : It stores food for the developing embryo. Q : It is called the 'poor man's protein'. R : It can grow into new plant. S : It absorbs water from the soil. T : It holds the plant firmly in the ground. A. P and R B. P, Q and R C. P only D. S and T

40. Which of the following is an incorrect match? A. Ginning – Separation of fibres from seeds B. Recycling – Making useful things from waste C. Stratosphere – It is the coldest layer of atmosphere D. Refuse – The fourth 'R' 41.

37. In the given figure, which blood vessels represent pulmonary vein, pulmonary artery and vena cava respectively?

A. C.

P, Q and R P, Q and S

B. D.

Q, P and R Q, P and T

38. A group of social workers has transformed a dry area in the Rajasthan's Alwar district into a green place. They have revived dried-up rivers by constructing water-harvesting structures. What are the names of those rivers? A. Arveri and Ruparel B. Sarsa and Bhagani C. Arveri and Jahazwali D. All of these 39.

X

Which of the following are the functions of the part marked X?

The given figure shows the skeleton of an adult human with some of its parts labelled. Identify the incorrectly labelled parts. A. Femur and Pelvis B. Radius and Ulna C. Tibia and Fibula D. Radius and Humerus

42. Which of the following is an incorrect statement? A. Cotton yarn shrinks away from flame and burns and smells like burning paper. B. Silk has come under fire from animal right activists. C. Wool fibres have an outer layer scales that reduce the ability of dirt and dust to penetrate the fibre. D. A spinneret is used to make nylon but is not needed to make cotton or wool fibres.

16th NSO - SET A

6

43. Which of the following is classified correctly?

A.

Banana : Fibrous root : Reticulate venation

B.

Banyan : Tap root: Parallel venation

C.

Rose : Tap root : Reticulate venation

D.

Maize : Fibrous root : Reticulate venation

45. Given below are statements about importance of minerals made by four students :

44. The given predator-prey relationships were observed among four living things P, Q, R and S.

P is eaten by S. P feeds on R. S feeds on R but not Q. R gets its food from Q.

Which one of the following is the correct classification of the living things?

Food Prey producer

A. B. C. D.

Q Q R S

Prey/ Predator

S R Q R

R P S P

Which of the students have made incorrect statements?

Predator P S P Q

A.

Ali and Swati

B.

Ali and Lily

C.

Ali, Lily and Swati

D.

Mohan and Swati

Achievers Section P Blood pressure mmHg

46. Which of the following options is correct for the object having a straight line motion represented by the graph shown in figure?

C

O

R

S

T

120

D

t

Q

B

80 40

A s

A.

The object moves with constantly increasing velocity from O to A and then it moves with constant velocity.

B.

Velocity of the object increases uniformly.

C.

Average velocity is zero.

D.

The graph shown is impossible.

47. The given graph represents the pressure (systolic and diastolic) of a volume of blood moving through circulatory system via different blood vessels labelled as P, Q, R, S and T.

Match the vessels given in Column-I with their corresponding letters given in Column-II and select the correct option. Column-I Column -II (a) Venules (i) P (b) Capillaries (ii) T (c) Arterioles (iii) R (d) Veins (iv) Q (e) Arteries (v) S A. a-(i), b-(iv), c-(ii), d-(iii), e-(v) B. a-(i), b-(iii), c-(v), d-(iv), e-(ii) C. a-(v), b-(iii), c-(iv), d-(ii), e-(i) D. a-(ii), b-(iii), c-(iv), d-(v), e-(i)

16th NSO - SET A

7

48. Study the given set up to pass gas Z through lime water.

X is ________ and Y is ________. When _________ (Z) is passed through lime water, _________ is formed which makes lime water milky. A. Hydrochloric acid, zinc carbonate, hydrogen gas, calcium hydroxide B. Vinegar, sodium carbonate, hydrogen gas, calcium carbonate C. Acetic acid, baking soda, carbon dioxide, calcium carbonate D. Hydrochloric acid, vinegar, carbon dioxide, calcium hydroxide

Direction (Q. 49 & 50) : Refer the given passage and answer the following questions. Some organisms like fungi, etc. take in nutrients in

solution form from dead and decaying matter, and are called saprotrophs. Fungi also grow on pickles, leather clothes and other articles that are left in hot and humid weather for long time. Certain fungi live in the roots of trees and share shelter and nutrients. This is called symbiotic relationship. 49. W h i c h o f t h e f o l l o w i n g s t a t e m e n t s i s / a r e incorrect? (i) Fungi are called saprotrophs because they grow on pickles, leather and clothes. (ii) Saprotrophs lack chlorophyll, so cannot make food by photosynthesis. (iii) Like some fungi, lichens also show symbiotic relationship. (iv) The bacterium called Rhizobium shows symbiotic relationship as it provides shelter, water and minerals to legumes and, in return, the legumes provide food which they prepare by photosynthesis. A. (i) and (iv) B. (i) and (ii) C. (ii) and (iii) D. (iv) only 50. Which of the following organisms shows symbiotic relationship? A. All fungi B. Lichens C. Rhizobium D. Both B & C


Class 7 16th

SET B Year 2013

Mental Ability 1.

Select the correct match of shaded fraction.

A.

2´

2 5

⇒

B.

3´

1 9

⇒

C.

D.

2 ⇒ 3 1 7´ ⇒ 3

2.

In the given question, which number will replace the question mark?

A. B. C. D.

3.

The figure shows a square PQRS being folded along QT such that point P touches SR at point U. Given that ∠TQU is 41°, find ∠RQU.

A piece of sheet is folded and cut and then unfolded as shown in the figure. Select a figure which exactly resembles the unfolded paper.

A.

B.

C.

D.

7.

The average perimeter of a rectangle 42 cm × 74 cm and a square is 244 cm. What is the ratio of the area of rectangle to the area of square?

A. B. C. D.

8.

0.63 of Mohit’s money is equal to 1.5 times Tarun’s money. If Mohit has ` 116 more than Tarun, how much money does Mohit have?

A. B. C. D.

9.

The line graph shows the profit made by a company from January to April. Some ink was spilled on the graph. What was the average amount of profit made by the company from January to March?

A. B. C. D.

= = =

4´

=

25 59 48 73

2

4

0

1

2

4

3

1

3

36

?

91

A. B. C. D.

4.

Find the figure from the options which will continue the series established by Problem figures.

8° 7° 9° 11°

A.

B.

C.

D.

5.

The ratio of the number of fiction books to non-fiction books to dictionaries was 2 : 5 : 4. After a librarian bought another 68 books of each type, the new ratio became 23 : 32 : 29. How many dictionaries were there at first? A. 16 B. 14 C. 12 D. 48

6.

677 677 777 777

` ` ` `

` ` ` `

: : : :

1204 1024 1024 1204

200 84 190 80

20,667 31,667 30,667 25,667

16th NSO - SET B

2

A. B. C. D.

Sonu Sahil Sarthak Amit

1 1 and ✡ = , which one of the following 4 2 has the greatest value?

11. If ✆ =

A. B. C. D.

✆ ✆ ✆ ✆

+✡ ÷✡ ×✡ –✡

12. Count the number of cubes in the given figure?

A.

37

B.

39

C.

38

D.

35

13. If is

A. C.

1 1 = 0.16134, then the value of 0.0006198 6.198 0.016134 1613.4

B. D.

0.16134 16134

14. The line graph shows the number of cakes Zarrin sold from March to June. If Zarrin earned ` 12 for every cake sold, then how much did she earn from March to June ?

A.

` 340

B.

` 360

C.

` 4080

D.

` 4800

Number of cakes sold

10. Sonu is taller than Sarthak. Amit is taller than Sonu. Sahil is taller than Amit. Samir is the tallest. If they are arranged according to their heights, who will be in the middle?

120 100 80 60 40 20 0

March April

May

June

15. Number of factors of the product of the highest common factor of 18 and 24 and the eighth multiple of 6 is

A. B. C. D.

18 288 22 16

B.

C. D.

The bulb is connected across 60 joules, 220 volts of energy is consumed. 60 unit of current will flow in the bulb. 220 unit of current will flow in the bulb.

Science 16. The temperature changes in a closed kettle of water was recorded for 14 minutes and represented in the graph below. Which of the following statement is true?

18. Human eye has a converging lens system that produces an image at the back of the eye. If the eye views a distant object, which type of image is produced?

A. B.

C.

D.

The kettle of water was heated for 6 minutes. There was less water in the kettle at point E than at point A. The water took 6 minutes to reach its boiling point after it was heated. The water in the kettle started boiling at C.

17. Marking on a bulb is 60 W, 220 V. What does it signify?

A.

The bulb is connected across the 220 volts, 60 joules of energy is consumed for every second.

A. B. C. D.

Real, erect, same size Real, inverted, diminished Virtual, erect, diminished Virtual, inverted, magnified

19. An electric kettle is plugged in and switched on. The fuse in the plug blows immediately. Which single fault could cause this ?

A.

The earth wire is not connected to the kettle.

B.

The line wire and neutral wire connections in the plug are swapped around.

C.

The line wire touches the metal case of the kettle.

D.

The wires connected to the plug are too thin.

16th NSO - SET B 20. A point object P moves towards a convex mirror with a constant speed v, along its optic axis. The speed of the image

A. B. C. D.

Is always less than v Is always more than v Is equal to v Decreases as P comes closer to the mirror.

21. Two friends X and Y started from the same location and went 30 km along a road in the same direction as shown in graph. Which among the following statement is correct?

A. B. C. D.

Both are moving with same speed. Y moves with non uniform speed. X completes his journey early. Y overtakes X at 10:10 a.m.

22. The bulb in the circuit given here does not glow. Which labelled part is responsible for this ?

A.

P and S

B.

P only

C.

R only

D.

S only

23. A U tube is immersed in ice water as shown in the figure. What will you observe after sometime ?

A. B. C.

D.

P and Q will move downwards. P and Q will move upwards. P will move upwards and Q will move downwards. P will move downwards and Q will move upwards.

3 24. Which of the following statement (s) is/are true?

(I)

We can find east-west direction with the help of a magnet. (II) Copper is a magnetic material. (III) A cylindrical magnet has only one pole, either north or south pole. A. Only I B. Both (I) and (II) C. Only (III) D. Both (I) and (III)

25. Mr. Kumar forgot a water bottle in his car parked out on a sunny day. On the next day, when he came back and took the bottle out, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to

A. B. C. D.

Saturation and evaporation Boiling and condensation Evaporation and condensation Condensation and saturation

26. The rocks underneath the lake located close to Rahul's house are made of limestone. Which of the following are correct about the lake's water after an acid rain?

1.

It turns red litmus to blue.

2.

Neutralisation reaction occurs.

3. Phenolphthalein remains colourless A. 1 and 2 B. 1 and 3 C. 2 and 3 D. 1, 2 and 3

27. Read the given statements and select the correct option. Statement 1 : The ash produced from burning a magnesium ribbon is dissolved in water to get a basic solution. Statement 2 : It is a physical change as the substance formed is also composed of same elements Mg, H and O. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Both statements 1 and 2 are false.

16th NSO - SET B 28. During a group discussion on the topic "Rusting", three students, Naina, Rohit and Mehak gave the following statements: Naina : Stainless steel rusts more quickly as it contains carbon and metals like chromium, nickel and manganese. Rohit : Salty water slows the process of rust formation as it contains many salts. Mehak : Depositing a layer of iron on zinc is called galvanisation. Choose the correct option. A. Rohit and Mehak are correct. B. Naina and Rohit are correct. C. Naina is correct while Rohit and Mehak are wrong. D. All the three are wrong. 29. I can form a separate layer on water. You use me for making paper translucent. Who am I?

A. B. C. D.

Lemon juice Honey Mustard oil Sugar solution

30. Some bags of cement were lying in the open playground of Raghu's school for the construction purpose. Due to rain at night, all the bags got wet. If the sun shines brightly on next day, then what type of change will Raghu observe in the cement?

A. B. C. D.

Seasonal change Reversible change Irreversible change Periodic change

31. Rima prepared an indicator paper by dipping a paper strip in a solution of X. She put a few drops of an unknown solution Y which contains H+ ions less than OH – ions on this paper. She observed that the colour of paper changed to yellow. What do you think was solution X?

A. B. C. D.

Red litmus solution Phenolphthalein Methyl orange Turmeric solution

32. Which one of the following is an incorrect statement?

A.

B.

C.

D.

Pulmonary artery carries oxygenated blood from the lungs to the heart. Ozone present in the troposphere is harmful to animals. The seeped water collects between layers of hard rocks, this is called an aquifer. Eutrophication is a natural phenomenon in freshwater bodies.

4 33. Given below is the diagrammatic sectional view of the human respiratory system. Which set of three parts out of I-VI have been correctly identified?

IV VI III

V

II I

A. B. C. D.

(I) Bronchioles, (IV) Pharynx, (VI) Bronchus (III) Bronchi, (IV) Pharynx, (VI) Trachea (I) Bronchioles, (II) Alveolus, (VI) Bronchus (II) Alveolus, (IV) Larynx, (V) Glottis

34. Which of the following is not the correct example of structural adaptation in animals?

A.

A desert fox losing excess heat through its large ear.

B.

A monkey using its strong, long limbs and tail for grasping branches.

C.

A polar bear balancing itself on its paws with stiff hair.

D.

Toucan has developed sticky pads on its feet to help it to reach the fruits on branches which are otherwise too weak to support its weight.

35. A rare plant in a botanical garden has been infected with specific fungi that feed on sugar molecules. After careful examination, a botanist suggested the following surgical intervention : removing the infected portion i.e., a ring of bark about 2 inches in height and about 2 cms wide. This will remove the cambial cells, phloem, endodermis, cortex and epidermis of the stem. Which of the following will be the consequence of such a surgical intervention?

A.

B.

C.

D.

Flow of food downwards will be affected but flow of water upwards will be maintained. Flow of water upwards will be affected but flow of food will be maintained. Both the flow of food and water will be affected. Neither the flow of food nor the water movement will be affected.

16th NSO - SET B 36. Silk obtained from silkworm is a product of ____.

A. B. C. D.

5 41. Refer the given flow chart. Aquatic plants

Skin of caterpillar Salivary glands of silk moth Salivary glands of caterpillar Skin of silk moth

Floating

37. Which of the following statements is incorrect?

A. B. C. D.

Soil helps forests to grow and regenerate. Forests protect the soil from erosion. Forests influence the climate and water cycle. Plants and animals in forest are not dependent on each another.

l l l

Lemna Utricularia Wolffia

Partially submerged l l l

Vallisneria Water lily Sedge

Fully submerged l l l

Hydrilla Tape grass Salvinia

Which of the following plants are incorrectly classified? A. Utricularia, Vallisneria, Salvinia B. Lemna, Vallisneria, Salvinia C. Wolffia, Water lily, Tape grass D. Utricularia, Water lily, Tape grass

38. Study the given diagrams showing the cross-section of two flowers. Which of the following statements is/are correct regarding them?

42. Ridhima took two test tubes labelled as 1 and 2 as shown in the figure. In test tube 1, she put one table spoon of boiled rice and in test tube 2, she put one table spoon of boiled rice after chewing it for 3-5 minutes. Then she added 3-4 mL of water in both the test tubes. Thereafter, she poured 2-3 drops of iodine solution in each of the test tubes.

(i) The flowering plants have developed from seeds. (ii) Flower X is a female flower and flower Y is a bisexual flower. (iii) Fertilization can take place in both flowers. A. (i) only B. (ii) only C. (i) and (iii) D. (ii) and (iii)

39. The clean and selected wool fibres are passed through rollers, which straightens the fibres and removes the unwanted matter. This process is called as ____. A. Shearing B. Scouring C. Carding D. Spinning. 40. Read the given statements and select the correct option. Statement 1 : Climate is the current condition or the state of atmosphere of a particular place in terms of humidity, cloudiness, temperature, wind, etc. Statement 2 : Weather refers to the long term (usually 25-30 years) average environmental conditions of a particular place. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Both statements 1 and 2 are false.

Which of the following would be the expected observation by Ridhima?

A.

B.

C.

D.

Colour changes to blue-black in test tube 1 as rice is rich in starch. Colour changes to blue-black in test tube 2 as saliva breaks down the starch into sugars. Colour changes to blue-black in both the test tubes. Colour does not change in either of the test tubes.

43. Which one of the following pairs is correctly matched? A. Tibia and – Both form part of knee joint Fibula B. Crabs and – Possess exoskeleton Cockroaches C. Shoulder joint – Ball and socket type of joint and Elbow joint D. Vitamin D – Helps in blood clotting

16th NSO - SET B

6

44. Rehan saw a dead rat in his garden. He also spotted some earthworms and millipedes near the rotten rat. Rehan went to school and told his teacher that earthworms and millipedes are decomposers. His teacher told him that he is not correct because ______.

A.

B.

A. B.

C.

Earthworms and millipedes break down the dead rat into smaller pieces to speed up the process of decomposition.

45. Which of the following is likely the reason for the shown change in the population of mosquito larva in a pond?

C.

D.

Occurrence of oil spill over the pond Fish are introduced into the pond Most of the mosquito larvae have changed into mosquitoes All of these

Population of mosquito larva

Earthworms and millipedes break down the dead rat into simpler substances Earthworms and millipedes break down the dead rat into smaller pieces for easy digestion Earthworms and millipedes break down the dead rat into simpler substances and return it to the soil as nutrients

D.

No. of days

Achievers Section 46. A cyclist starts from the centre O of a circular park of radius 1 km, reaches the edge P of the park, then cycles along the circumference and returns to the centre along QO as shown in figure. If the round trip takes 10 minutes, then the average speed of cyclist is

A.

B.

C.

D.

48. Which one of the following bar charts best represents the composition of nitrogen (N2), oxygen (O2) and carbon dioxide (CO2) in inhaled and exhaled air during breathing in human beings?

Q

π+4 km per minute 10 π+4 km per minute 20 π km per minute 4 p km per minute

P

O

A.

47. Fill in the blanks by choosing the correct option. Vinegar +

Baking soda P

Turns Turns China phenolphthalein to rose to

+ Ca(OH)2

P Q A. Sodium CO2 hydrogen carbonate B. Lime water H2 C. Sodium H2 hydrogen carbonate D. Magnesium CO2 hydroxide

B.

+ Other substances

Y

X Q

Q

R R X CaCO3 Red

+ H2O

C.

Y Pink

CaO CaO

Colourless Green Pink Red

CaCO3 Colourless Green

D.

16th NSO - SET B

7

Direction (Q. 49 & 50) : Refer the given passage and answer the following questions. A farmer is growing crop regularly in his field. He uses chemical fertilizers, pesticides, organic manures as well as biofertilizers. There is a huge lake nearby to his field and a factory which emits smoke as a by product. 49. A considerable increase in water pollution was noticed as the farming activity intensified. The most likely reason for this could be _______.

A. Chemical fertilizers leached into the lake from the field B. Living organisms used in biofertilizers polluted the lake

C. Organic manure leached into the lake from the field D. Smoke particles from the industry got settled in moist surroundings of the lake 50. An expert agriculturist suggested the farmer to minimize the use of chemical fertilizers and instead use biofertilizers as they have many advantages over chemical fertilizers. Which of the following is not true regarding biofertilizers? A. They B. They C. They D. They


are economical. will least pollute lake. are renewable. require large set-up for their production.

ANSWER KEYS 12TH NSO 1. (D) 11. (C) 21. (D) 31. (A)

2. (A) 12. (C) 22. (C) 32. (D)

3. (C) 13. (A) 23. (C) 33. (D)

4. (C) 14. (B) 24. (C) 34. (C)

5. (A) 15. (D) 25. (C) 35. (B)

6. (A) 16. (A) 26. (C) 36. (C)

7. (B) 17. (D) 27. (B) 37. (B)

8. (A) 18. (A) 28. (B) 38. (C)

9. 19. 29. 39.

(A) (C) (A) (C)

10. 20. 30. 40.

(D) (C) (D) (C)

41. (A)

42. (C)

43. (B)

44. (A)

45. (C)

46. (B)

47. (A)

48. (D)

49. (B)

50. (A)

7. (B) 17. (B) 27. (D) 37. (C) 47. (B)

8. (B) 18. (A) 28. (D) 38. (A) 48. (B)

9. 19. 29. 39. 49.

(A) (B) (A) (D) (B)

10. 20. 30. 40.

(D) (D) (A) (C)

7. 17. 27. 37. 47.

(D) (C) (A) (C) (C)

8. 18. 28. 38. 48.

(A) (D) (A) (A) (D)

9. 19. 29. 39. 49.

(B) (B) (B) (B) (A)

10. 20. 30. 40. 50.

(B) (A) (A) (B) (D)

13TH NSO 1. (A) 11. (C) 21. (C) 31. (D) 41. (B) 50. (D)

2. (C) 12. (C) 22. (A) 32. (D) 42. (C)

3. (C) 13. (B) 23. (B) 33. (C) 43. (A)

4. (C) 14. (C) 24. (D) 34. (B) 44. (C)

5. (D) 15. (B) 25. (A) 35. (C) 45. (B)

6. (C) 16. (A) 26. (C) 36. (D) 46. (D)

14TH NSO 1. 11. 21. 31. 41.

(C) (B) (A) (C) (A)

2. 12. 22. 32. 42.

(C) (A) (D) (C) (A)

3. 13. 23. 33. 43.

(B) (A) (A) (B) (C)

4. 14. 24. 34. 44.

(D) (C) (B) (C) (B)

5. 15. 25. 35. 45.

(B) (B) (B) (C) (C)

6. 16. 26. 36. 46.

(D) (B) (D) (B) (A)

15TH NSO 1. 11. 21. 31. 41.

1. 11. 21. 31. 41.

(B) (C) (B) (A) (A)

(C) (B) (B) (A) (B)

2. 12. 22. 32. 42.

2. 12. 22. 32. 42.

(C) (C) (C) (C) (D)

(A) (C) (A) (D) (A)

3. 13. 23. 33. 43.

3. 13. 23. 33. 43.

(B) (C) (D) (A) (A)

(B) (C) (B) (D) (C)

4. 14. 24. 34. 44.

4. 14. 24. 34. 44.

(D) (D) (C) (A) (A)

(B) (B) (A) (B) (D)

5. 15. 25. 35. 45.

SET A (A) 6. (C) 16. (D) 26. (C) 36. (A) 46.

(B) (C) (B) (D) (D)

7. 17. 27. 37. 47.

(C) (D) (B) (B) (B)

8. 18. 28. 38. 48.

(A) (C) (C) (B) (C)

9. 19. 29. 39. 49.

(D) (D) (C) (C) (B)

10. 20. 30. 40. 50.

(D) (A) (C) (C) (B)

5. 15. 25. 35. 45.

SET B (B) 6. (B) 16. (D) 26. (B) 36. (C) 46.

(B) (A) (A) (D) (D)

7. 17. 27. 37. 47.

(C) (A) (A) (B) (C)

8. 18. 28. 38. 48.

(D) (A) (B) (D) (A)

9. 19. 29. 39. 49.

(D) (C) (A) (C) (C)

10. 20. 30. 40. 50.

(D) (C) (D) (B) (B)

(A) (D) (D) (D) (C)

7. 17. 27. 37. 47.

(B) (B) (A) (B) (C)

8. 18. 28. 38. 48.

(B) (B) (A) (D) (C)

9. 19. 29. 39. 49.

(D) (C) (B) (B) (A)

10. 20. 30. 40. 50.

(B) (A) (B) (C) (D)

(A) (D) (C) (C) (B)

7. 17. 27. 37. 47.

(C) (A) (C) (D) (A)

8. 18. 28. 38. 48.

(A) (B) (D) (C) (A)

9. 19. 29. 39. 49.

(B) (C) (C) (C) (A)

10. 20. 30. 40. 50.

(D) (A) (C) (D) (D)

16TH NSO SET A 1. 11. 21. 31. 41.

(C) (A) (B) (A) (C)

2. 12. 22. 32. 42.

(A) (B) (C) (C) (D)

3. 13. 23. 33. 43.

(D) (B) (C) (C) (C)

4. 14. 24. 34. 44.

(B) (C) (B) (C) (B)

5. 15. 25. 35. 45.

(A) (C) (C) (B) (C)

6. 16. 26. 36. 46.

SET B 1. 11. 21. 31. 41.

(D) (B) (D) (C) (A)

2. 12. 22. 32. 42.

(D) (C) (D) (A) (A)

3. 13. 23. 33. 43.

(A) (C) (A) (B) (B)

4. 14. 24. 34. 44.

(A) (C) (A) (D) (D)

5. 15. 25. 35. 45.

(D) (A) (C) (A) (D)

6. 16. 26. 36. 46.

Class 7 Nso 5 Years e Book14

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