PRELIMINARY EXAMINATION SCIENCE- SET 1 Class: X
Time :3Hrs
Date:11/0/1!
Ma"#Mar$s:%0
GENERAL INSTRUCTIONS:
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Question Question paper paper compris comprises es of of two two section sections, s, A and B. B. You You have have to attemp attemptt both both the sections. All All ques questi tion ons s are are comp compul ulso sory ry.. Ques Questio tion n numbe numbers rs 1 to to 3 in sect section ion A are are one mar mar ques questio tions ns,, to be be answered in one word or one sentence. Ques Questio tion n numbe numbers rs ! to" are are two two mar mar ques questio tions ns,, to be be answ answere ered d in abou aboutt 3# words each. Ques Questio tion n numbe numbers rs % to1& to1& are are 3 mars mars que questi stions ons,, to be answ answer ered ed in in about about $# words. Question numbers 2# to2! are $ mar questions, to be answered in about "# words. Ques Questio tion n numbe numbers rs 2$ to to !2 in sect section ion B are are ()Q ()Q based based on prac practic tical al sill sills. s. *ach question is a one mar question.
SECTION A
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+tate (endeleevs periodic law.
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-ive -ive the the com common mon name name of of the plant plant on on which which (endel (endel perfor performed med his eperiments.
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/n a food chain chain compri comprisin0 sin0 fro0s, fro0s, insec insects, ts, birds birds and and 0rass, 0rass, which which one one of the or0anisms is liely to have maimum concentration of harmful nonbiode0radable chemicals in its body
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)hoos )hoose e from from the the foll follow owin0 in0 eleme element nts s whos whose e atom atomic ic number numbers s are are 0ive 0iven n in in parentheses
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415, e425, )4'5, 64&5, 7a4115, )l41"5, (04125 a5
+mallest element of 3
rd
period.
b5 A noble 0as. c5
A metal of 3 rd period havin0 valency 1.
d5 (ost nonmetallic element of 2 nd period. $
-ive reason for the followin0
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i5 +un appears red at sunrise and sunset. ii5 Atmosphere appears dar to an astronaut.
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a5 8istin0uish between biode0radable and nonbiode0radable pollutants. b5 )hoose the bio de0radable pollutants from the followin0. +ewa0e, 889, :adioactive waste, A0riculture waste
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;hat do you mean by power of accommodation eye ;hat is the ran0e of vision for a normal healthy person a5 +tate two disadvanta0es of convertin0 forests into mono culture. b5 -ive any two advanta0es of water stored under0round. c5 +tate any two measures to conserve wildlife.
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1# (i) State Snell’s law of refraction of light.
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ii) A transparent medium A floats on another transparent medium B. When a ray of light travels obliquely from A into B the refracted ray bends away from the normal. Which of these two media A or B are optically denser and why!
11 (ention the type of mirrors used as 4i5 side rear view mirrors 4ii5 shavin0 mirrors 4iii5 dressin0 mirrors .
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13 8istin0uish between acquired and inherited traits by 0ivin0 one eample each.
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1! ;hat is 0enetics +tate any two factors that could lead to the rise of new species.
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a5
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a5 ow many e00s are produced every month by either of the ovaries in a human female b5 ;here does fertili>ation taes place in the female reproductive system c5 ;hat happens in case the e00s released by the ovary is not fertili>ed
1% -ive reasons for the followin0 ? a5 @nsaturated hydrocarbons show addition reactions but not saturated hydrocarbons . b5 )arbon only forms covalent compounds.
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An or0anic compound A of molecular formula ) 2! on reduction 0ives another compound B of molecular formula ) 2'. B on reaction with chlorine in the presence of sunli0ht 0ives ) of molecular formula ) 2$)l. a5 7ame the compound A,B and ). b5 ;rite the equation for the conversion of A to B and name the type of reaction.
2# 4a5 9he power of a lens is 2.$ 8. ;hat ind of lens it is and what is its focal len0th2 4b5 8raw a ray dia0ram of an ima0e when an ob=ect is placed on the principle ais of a conve lens between focus and optical centre. ;rite the nature of the ima0e.
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a5 )omplete the followin0 equations. id )3) ) 2$ C 2)2$ 27a C
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b5 +tate two harmful effects of drinin0 alcohol. c5 ;hat measures would you tae to discoura0e people in your society who consume alcohol 22
a5 8raw a labelled dia0ram to show fertili>ation in flowerin0 plants. $ b5 8ifferentiate between selfpollination and cross pollination.
23 +tudy the dia0ram below and answer the followin0 questions.
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a5 i5 7ame the defect of vision depicted in the dia0ram. i5
2! a5 ;hy do we classify elements
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b5 ;hy do elements of same 0roup have similar chemical properties c5 ow will the tendency to 0ain electrons chan0es as we 0o from left to ri0ht across a period
SECTION &
2$ n a5 b5 c5
addin0 7a) 3 to acetic acid, one immediately observes stron0 effervescence hears a hissin0 sound 0ets pun0ent smell
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d5 observes the evolution of a coloured 0as 2' ;hich of the followin0 0ives vine0ar lie smell a5 Acetic acid b5 *thanol c5 +odium bicarbonate d5 +odium carbonate
2" A baset of ve0etables contain carrot, potato, radish and tomato. ;hich of them represent the correct homolo0ous structures a5 )arrot and potato b5 )arrot and tomato c5 :adish and carrot d5 :adish and potato
2% ;hich of the followin0 setches does not illustrate buddin0 in yeast
4a5 / 4b5 // 4c5 /// 4d5 /D 2& ;hile observin0, a student will find that shape of amoeba as a5 :ound b5 val c5 /rre0ular d5 :od lie 3# /n buddin0 a5 )ell divides transversely. b5 )ell divide lon0itudinally c5 7ucleus divides followed by the development of protuberance. d5 A small protuberance develops followed by nuclear division. 31 ;hich one of the followin0 is the best setup for tracin0 the path of a ray of li0ht throu0h a rectan0ular 0lass slab2
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a5 / b5 // c5 /// d5 /D
32 "f we decrease the thic#ness of glass slab the lateral displacement (a) (b) (c) (d)
$ecreases "ncreases %emains the same &ay increase or decrease
33 Which of the following is correct about performing e'periment with glass slab! (a) ins should be fi'ed slanting (b) ins should stand in line (c) ins need to be hammered (d) ins need to be fi'ed by loo#ing at heads of pins already fi'ed.
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/n an eperiment to study the refraction of li0ht throu0h a prism, a student mared three an0les as 1, 2 and 3 as shown in the above fi0ure.9he an0le of deviation is mared as (a5 1 4b5 2
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4c5 3 4d5 1%## 2 3$ A student is to find the focal len0th of 4i5 a concave mirror 4ii5 a conve lens by focusin0 the ima0e of a distant ob=ect on a screen. e will observe the ima0e on the same side of the ob=ect in a5 Both cases b5 )ase 4i5 but not in case 4ii5 c5 )ase 4ii5 but not in case 4i5 d5 7either case 4ii5 nor in case 4i5 3' @sin0 a conve lens a student obtained a sharp ima0e of the 0rill of a window in the laboratory on a screen. 6or 0ettin0 better result she focused a distant tree instead of the 0rill. 6or 0ettin0 a sharp ima0e on the screen, in which direction should the lens be moved a5 Away from the screen. b5 9owards the screen. c5 Behind the screen. d5 Dery far away from the screen.
3" ;hich of the followin0 part is not found in a 0ram seed a5 )otyledons b5 *ndosperm c5 :adicle d5 Elumule 3% /n which of the followin0 water sample soap will show maimum cleanin0 capacity a5 8istilled water b5 ;ell water c5 8istilled water in which )alcium sulphate is dissolved d5 8istilled water in which )alcium bicarbonate is dissolved 3& ;hile studyin0 the binary fission in amoeba, an observer finds that at the end of this process a5 A parent cell and a dau0hter cell are produced. b5 /dentity of the parent cell is lost. c5 9wo dau0hter nuclei are formed. d5 8ivision of cytoplasm starts. !# ;hich of the followin0 pairs of or0ans is analo0ous to each other a5
!1 9he process represented in the dia0ram below is the pg. 7
a5 6ormation of spores in amoeba b5 6ormation of bud tain0 place in amoeba c5 /dentical 0ametes bein0 formed in amoeba d5 6ormation of dau0hter cells in amoeba
!2 ;hich of the followin0 sodium compound is heated with castor oil in the main0 of soap a5 7a2)3 b5 7a)3 c5 7a d5 )3)7a
BEST OF LUCK
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