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Important Instructions for the

School Principal

(Not to be printed with the question paper)

1) This question paper is strictly meant for the use in School Based Summative Assessment-

II, March-2012 only. This question paper is not to be used for any other purpose except

mentioned above under any circumstances.

2) The intellectual material contained in the question paper is the exclusive property of

Central Board of Secondary Education and no one including the user school is allowed to

publish, print or convey (by any means) to any person not authorised by the Board in this

regard.

3) The School Principal is responsible for the safe custody of the question paper or any other

material sent by the Central Board of Secondary Education in connection with School

based SA-II, March-2012, in any form including the print-outs, compact-disc or any other

electronic form.

4) Any violation of the terms and conditions mentioned above may result in the action

criminal or civil under the applicable laws/byelaws against the offenders/defaulters.

Note:Please ensure that these instructions are not printed with the question

paper being administered to the examinees.

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SUMMATIVE ASSESSMENT II, 2012

II, 2012

SCIENCE /

Class X / X

Time allowed : 3 hours Maximum Marks : 80

3 80

General Instructions :

(i) The question paper comprises of two Sections, A and B. You are to attempt both the

sections.

(ii) All questions are compulsory.

(iii) There is no overall choice. However, internal choice has been provided in all the fivequestions of five marks category. Only one option in such questions is to be attempted.

(iv) All questions of Section-A and all questions of Section-B are to be attempted separately.

(v) Question numbers 1 to 4 in Section-A are one mark questions. These are to be answered in

one word or in one sentence.

(vi) Question numbers 5 to 13 in Section-A are two marks questions. These are to be answered

in about 30 words each.

(vii) Question numbers 14 to 22 in Section-A are three marks questions. These are to be

answered in about 50 words each.

(viii) Question numbers 23 to 25 in Section-A are five marks questions. These are to be answered

in about 70 words each.(ix) Question numbers 26 to 41 in Section-B are multiple choice questions based on practical

skills. Each question is a one mark question. You are to select one most appropriate

response out of the four provided to you.

(i)

(ii)

(iii)

(iv)

(v) 1 4

(vi) 5 13 30

(vii) 14 22 50

(viii) 23 25 70

(ix) 26 41

SC - 2015

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SECTION-A /

1. Write next two members of the homologous series given below C

2H

6, C

3H

8

C

2H

6, C

3H

8

1

2. A person is advised to wear spectacles with concave lenses. What type of defect ofvision is he suffering from ?

h c

c i i i i i ?

1

3. In the following food chain, grass provides 4000J of energy to the grasshopper.How much energy will be available to snakes and frogs ?Grass, Grasshopper, Frogs, Snakes

a d a d d dk4000J

: ?

1

4. What is meant by non-biodegradable waste ? Identify biodegradable waste fromthe following :Empty packet of chips, Empty plastic bottle of mineral water, Empty paper box ofsweets, Empty tin of a cold drink.

p n ? b

, ( ) ,

,

.

4

5. Two element X, Y and Z belong to 17th group but to 2nd,3rd and 4th periodrespectively. Number of valence electrons in Y is 7. Find the number of valenceelectrons in X and Z.

tX,Y,Z 17 c: ,

Y 7 X Z

2

6. (a) Atomic radius of hydrogen is 37pm. Express it in meters.

(b) How does atomic size vary in a group and in a period ?(a) 37 pm

(b)

?

2

7. (a) List any two methods of asexual reproduction.(b) Explain how spirogyra reproduces ?

(a)

(b) ?

2

8. Explain why does menstruation occur in human females ?

?2

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9. An object is kept at a distance of 5cm in front of a convex mirror of focal length10cm. Calculate the position and nature of the image formed.

10cm 5cm

2

10. Why do stars twinkle while planets do not ?

?2

11. (a) Explain how a normal human eye is able to see distinctly the objectplaced at a distance as well as those placed at a nearer distance.

(b) What is the far point and near point of a normal human eye ?

(a)

(b)

?

2

12. How are fossil fuels formed ? Why should we use these resources judiciously ?

?

?

2

13. It is said that participation of the local people can indeed lead to the efficientmanagement of forests. To what extent this holds true ? Explain briefly with thehelp of an example.

` ` ?

2

14. (a) Write chemical names of CH3COCH3, C2H5COOH.(b) What happens when acetic acid and ethanol react in presence of

concentrated H2SO4 ? Write the reaction there in.

(a) CH3COCH3, C2H5COOH

(b) H2SO4

?

3

15. (a) What are metalloids ? Write any two examples.(b) Given below are some of the elements of first group

Li, Na, K(Their atomic numbers are 3,11,19 respectively and they belong to 2nd3rd and 4th period respectively)Arrange these in the decreasing order of metallic character exhibitedby them.

(a) ?

(b) Li, Na, K

( : 3,11,19

:

2nd

, 3rd

4th

)

3

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16. (a) Mention the two functions of ovaries in human female reproductivesystem.

(b) Mention the name of organ (i) that provides nutrition to embryo(ii) site where fertilized egg gets implemented.

(a)

(b) (i)

(ii)

2

17. (a) Name the scientist who worked out the rules of inheritance.(b) Mention any two strategies that are used by different species for

determining sex of their new borns.

(a)

(b)

3

18. (a) Differentiate between dominant and recessive traits.

(b) Genes control traits. Explain this statement with an example.(a)

(b) (traits)

3

19. (a) Explain the difference between analogous and homologous organs.(b) Identify the analogous and homologous amongst the following :

Wings of an insect, wings of a bat, forelimbs of a frog, forelimbs of a lizard.

(a)

(b)

, , ,

3

20. (a) Define power of a lens and write its S.I. unit.(b) A convex lens forms a real and inverted image of a needle at a distance of

50 cm from it. Where is the needle placed in front of the lens if image size isequal to the object size ? Also find the power of the lens.

(a) S I

(b) 50cm

?

3

21. (a) A ray of light falls normally on a face of a glass slab. What are the values ofangle of incidence and angle of refraction of this ray.

(b) Light enters from air to a medium X. Its speed in medium X becomes

1.5 x 108 m/s. Speed of light in air is 3 x 108 m/s. Find the refractive indexof medium X.

(a)

?

(b) X X

1.5 x 108 m/s 3 x 108 m/s

X

3

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22. A person is unable to read a book clearly when kept at a distance of 25cm from hiseye. Name the defect .How can it be corrected ? Draw ray diagrams for(i) defective eye (ii) Corrected eye and explain them.

e 25cm

?

3

23. (a) Mention any two reasons to explain the ability of carbon to form a largenumber of compounds.

(b) Differentiate between saturated and unsaturated hydrocarbons givingone example of each.

(c) Name any other element which like carbon can form compounds whichhave chains upto seven or eight atoms. How do these compounds differfrom carbon compounds ?

(a)

(b) d

(c) t

?

OR/

(a) What are isomers ? Illustrate with one example.(b) Write the chemical formula of Benzene and draw its structure.(c) Write the name of unsaturated hydrocarbons which contains

(i) one or more double bonds (ii) one or more triple bonds.

(a) ?

(b)

(c)

(i)

(ii)

5

24. (a) Draw a labelled diagram of human male reproductive system.(b) Why are testes located outside the abdominal cavity?(c) List the two functions of testes.

(a)

(b) ?

(c)

OR/(a) Explain any two consequences of unsafe sex.(b) List any two surgical methods for contraception(c) Why has the government banned pre-natal sex determination ?

(a)

(b)

(c) ?

5

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25. (a) Draw a ray diagram in each of the following cases to show the positionand nature of the image formed when object is placed :(i) between focus and center of curvature of a concave mirror.(ii) between focus and pole of a concave mirror.(iii) between center of curvature and infinity for a concave mirror.

(b) Give mathematical formulae for determining magnification produced

by a spherical mirror. What does m=

1 signify ? Identify the mirror thatcan produce it.

(a)

:

(i)

(ii)

(iii)

(b)

m =1 ?

OR/(a) State Laws of refraction.(b) A ray of light enters from a medium A into a slab made up of a

transparent substance B (as shown in the figure). Refractive indices ofmedium A and B are 2.42 and 1.65 respectively. Complete the path ofray of light till it emerges out of the slab.

(a)

(b) A B

( )

A B : 2.42 1.65

A

B

5

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(i) (ii) (iii) (iv)

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

29. Manoj was asked to list the properties of acetic acid after he had studied them inthe laboratory. According to him acetic acid

(i) is insoluble in water.(ii) turns blue litmus paper red.(iii) reacts with Na2CO3 to form NaOH and CO2.(iv) has sweet smell like perfume.The correct property out of the above mentioned properties is -(a) i (b) ii (c) iii (d) iv

(i) (ii)

(iii) Na2CO3 NaOH CO2

(iv)

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

1

30. Ethanoic acid was added to Sodium bicarbonate solution and the gas evolved wastested with burning splinter. Which one of the following four observations iscorrect ?(a) The gas burns with pop sound and the flame gets extinguished.(b) The flame gets extinguished and gas does not burn.(c) The gas burns with a blue flame and the splinter burns brightly.(d) The gas is brown in colour.

?

(a)

(b)

(c)

(d)

1

31. While performing the experiment to determine focal length of a concave mirror, astudent obtains a blurred image of a distant object on a screen by using a concavemirror. In order to obtain a sharp image on the screen, he will have to shift themirror :(a) towards the screen(b) away from the screen.(c) either towards or away from the screen.

(d) to a position very far away from the screen.

1

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(a) (b)

(c) (d)

32. Select the set of minimum materials required for determining the focal length of a

convex lens by obtaining an image of a distant object.

(a) A lens holder, a convex lens, a concave lens, measuring scale

(b) A convex lens, a lens holder, a screen with stand, a candle and a match box.

(c) A convex lens, a lens holder, a screen with stand, a measuring scale.

(d) A convex lens, a lens holder, a screen with stand, a burning candle.

i

(a) , , ,

(b) , , , ,

(c) , , ,

(d) , , ,

1

33. Parallel rays from the top of a distant tree , incident on a concave mirror form animage on the screen four students draw ray diagrams as given below :

The diagram correctly showing the image of the tree on the screen is of

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

1

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

34. In which of the following will a student would observe that the ray of light passes

through the slab undeviated ?

?

1

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35. In which of the following diagrams the correct representation of angle of incidence(i) angle of refraction (r) and angle of emergence(e) is shown :

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

( i) , (r) (e)

?

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

1

36. The figures given below show the sequence of

(a) formation of bud in amoeba

(b) formation of spores in amoeba(c) formation in daughter cells in amoeba(d) formation of protozoa in amoeba.

(a) (b)

(c) (d) a a kdA

1

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37. A slide showing several amoeba was given to a student and was asked to focusthe amoeba undergoing binary fission. What will the student look for, to correctlyfocus on a living amoeba ?(a) An amoeba with many pseudopodia and a small nucleus.(b) A rounded amoeba with rounded nucleus.(c) An amoeba covered by a cyst and many nuclei.

(d) An amoeba with elongated nucleus and a constriction in the middle. Z

(a)

(b)

(c)

(d)

1

38. In figures given below two are showing process of buddingThese are

(a) I and II (b) I and III (c) I and IV (d) II and IV

(a) I II (b) I IV (c) I III (d) II IV

1

39. Which of the following does not show budding ?

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

1

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?

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

40. Students A, B and C were given five raisins of equal weight. The raisins weresoaked in distilled water at room temperature. A removed raisins after 20 minutes,B after two hours and C after 40 minutes. If PA, PB and PC denote percentageabsorption of water, obtained by students A, B and C respectively, then :(a) PA > PB > PC (b) PA < PB < PC(c) PA < PB > PC (d) PA > PB < PC

A, B, C

A 20 , B 2

C 40 PA, PB and PC . A, B, C

: (a) PA > PB > PC (b) PA < PB < PC(c) PA < PB > PC (d) PA > PB < PC

1

41. If X represents weight of soaked raisins and Y represents weight of dry raisins

then( )

100x y

y

is a way to calculate percentage of

(a) water absorbed by raisins in hypertonic solution.(b) water absorbed by raisins in hypotonic solution.(c) water lost by raisins in hypotonic solution.(d) water lost by raisins in hypertonic solution.

X Y ( )

100x y

y

(a)

(b)

(c)

(d)

1

- o 0 o -