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Important Instructions for theSchool 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 exceptmentioned 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 thisregard.

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 actioncriminal 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, 2012II, 2012

SCIENCE /

Class X / X

Time allowed : 3 hours Maximum Marks : 803 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 five

questions 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 appropriateresponse 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

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SECTION-A /

1. Write the electron dot structure of ethene (C 2H 4) molecule.(C2H4)

2. Mention the role of optic nerve in the human eye.

3. Name the phenomenon which denotes the progressive increase in concentration of harmfulchemicals at each trophic level.

4. Write full form of CFC. Name any device in which it is used.CFC

5. (i) State Modern Periodic Law.(ii) Give the total number of groups and periods in Modern Periodic Table.(i)(ii)

6. In which part of a group of Modern Periodic Table would you expect the elements to have(i) the highest metallic character ?(ii) the largest atomic size ?

Give reason for your answer.

(i)(ii)

7. Explain one way in which Bryophyllum plants can be reproduced by the method of vegetativepropagation.

8. How are the modes of reproduction different in unicellular and multicellular organisms ?

9. Define the power of a lens. State and define its S.I Unit ?S.I

10. Mention the reason for twinkling of stars. Draw a diagram to illustrate it.

11. Define power of accomodation of human eye. Why do some people use bifocal lenses ?

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12. (a) Name any two main elements present in coal.(b) Which gas is produced when coal burns in insufficient air ?(a)(b)

13. Mention any two stake holders in conservation of forests and what are their stakes ?

14. Name the main product formed in the following reactions and write chemical equation for eachreaction.(a) C2H 5OH+Na

(b) CH 3CH 2OH2 4Conc. H SO

443K

(c) CH 2 CH 2 + Br2

(a) C2H 5OH+Na

(b) CH 3CH 2OH 2 4H SO

443K

(c) CH 2 CH 2 + Br2

15. An atom has an electronic configuration 2, 8, 7.(a) Find the atomic number of this element.(b) To which of the following elements would it be chemically similar. (Atomic numbers are

given in parenthesis). Give reason for your answer.N(7) F(9) P(15) Ar(18)

(c) What are valence electrons ? What is the number of valence electrons in this element ?X 2, 8, 7

(a) X

(b)

N(7) , F(9) , P(15) , Ar(18)

(c) X

16. (a) What is meant by Pollination ? How does pollination occur ?(b) State the advantage of sexual reproduction over asexual reproduction.(a)(b)

17. (a) Giving reasons state whether the following are Homologous or Analogous organs :-(i) Wings of butterfuly and of an insect(ii) Wings of bat and bird

(b) Define Speciation.

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(a)(i)(ii)

(b)

18. Identify the picture given below and write its title. Also give its significance on the study ofevolution of species. (2 points)

19. Sex of a child depends on the father and not on the mother. Comment on this statement and support your answer with a suitable illustration.

20. (i) What is meant by magnification by spherical mirror ? Express it in terms of imagedistance and object distance.

(ii) The image of a distant object is formed at 20 cm from a concave mirror. What is thefocal length of the mirror ? Draw its ray diagram too.

(i)

(ii) 20 cm

21. (i) State the laws of refraction of light.

(ii) Velocity of light in water is3

4times the velocity of light in vacuum. Find the refractive

index of water.(i)

(ii)3

4

22. What is meant by scattering of light ? With the help of diagram, explain the reddish appearanceof the sun at sunrise and sunset.

23. (a) Identify the compounds A and B in the following reactions :

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(i) C2H5OH + CH 3CH 2COOH2 4Conc. H SO

A + H2O(ii) CH 3COOC 2H 5 + NaOH B + C2H 5OHWrite the term used for the reactions (i) and (ii) above.

(b) Draw the structure of the following compounds.(i) Bromopentane (ii) Butanol

(a) A B(i) C2H5OH + CH 3CH 2COOH

H SO2 4 A + H 2O

(ii) CH 3COOC 2H 5 + NaOH B + C2H 5OH(i) (ii)

(b)(i) (ii)

OR (a) Define the term homologous series of organic compounds ? Give an example.(b) What would be observed on adding 5% solution of alkaline potassium permanganate

drop by drop to some warm ethanol taken in a test tube ? Write the name of thecompound formed during chemical reaction. Write a chemical test to identify thiscompound.

(a)(b) 5%

24. (a) How does the embryo get nourishment inside the mothers body ? (b) What happens when the egg is not fertilised ?(c) Draw a neat and well labelled diagram of human female reproductive system.(a)(b)(c)

OR (a) What could be the reasons for adopting contraceptive methods ?(b) Draw a neat and well labelled diagram of a carpel showing germination of Pollen on

stigma.(c) Mention the role of seminal vesicle and prostate gland.(a)(b)(c)

25. (i) How far should one hold an object from a concave mirror of focal length 40 cm so as toget a virtual image twice the size of the object ?(ii) For a concave mirror draw ray diagrams to show the reflected ray in following cases

(a) A ray incident parallel to its principal axis.(b) A ray passing through its center of curvature before being incident on mirror.(c) A ray incident obliquely on pole of mirror.

(i) 40 cm

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(ii)

(a)

(b)

(c)

OR/ (i) An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens ofpower 10D. Find the size of the image.

(ii) Draw the following diagrams in your answer book and show the formation of the imageof object AB by completing the ray diagrams.

(i) 4 cm 10D 15 cm

(ii)

SECTION - B / 26. A student took CuSO 4 solution in four test tubes A, B, C and D. She placed small piece of Cu in

test tube A, Fe in test tube B, Zn in test tube C and A l in test tube D. After about an hour shenoticed that no deposition was formed on the piece of :(a) zinc (b) iron (c) copper (d) aluminium

A, B, C D CuSO 4 A Cu, B Fe

C Zn D A l

(a) (b) (c) (d)

27. A student took aqueous zinc sulphate, copper sulphate, iron sulphate and aluminium sulphatesolutions in four test tubes. She dipped an iron strip in each test tube. After sometime shewould observe the deposition of metal on iron in the test tube (s) :

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(a) P and Q (b) Q only (c) R only (d) R and S

(a) P Q (b) Q (c) R (d) R S

28. Pooja took some dilute acetic acid in a test tube. She then added sodium bicarbonate in the testtube. She observed that :(a) a solid settles at the bottom(b) the mixture becomes warm(c) the colour of mixture becomes green(d) a gas evolves

(a)(b)(c)(d)

29. Rahul added some ethanoic acid in a test tube containing water. He would observe that the

solution formed is :(a) pink and opaque (b) colourless and transparent(c) green and opaque (d) light blue and transparent

(a) (b)(c) (d)

30. The odour of ethanoic acid resembles with.(i) kerosene (ii) Vinegar (iii) rotten egg (iv) rose

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

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

31. A student determines the focal length of device X, by focussing the image of a far off object onthe screen positioned as shown in the figure below :

The device X is a :(a) convex lens (b) concave lens

(c) convex mirror (d) concave mirrorX,

X(a) (b)(c) (d)

32. To determine the focal length of a concave mirror, four students A, B, C and D obtained theimage of the window grill on a wall. They measured the distances as given below between.A Window grill and the wallB Window grill and the mirrorC Mirror and wallD Window grill and the wall and also between the mirror and the wall.Correct focal length will be obtained by(a) A (b) B (c) C (d) D

A, B, C D

A B C D

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

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33. Which of the following set of materials represents the minimum material required fordetermining the focal length of a convex lens by obtaining the image of a distant object on ascreen in your school laboratory.(i) Set A A candle, a match box, a convex lens, a lens holder, a screen with stand.(ii) Set B A lens holder, a convex lens, a concave lens, a measuring scale.

(iii) Set C A convex lens, a lens holder, a screen with a stand, a measuring scale.(iv) Set D A convex lens, a burning candle, a screen with a stand, a lens holder.(a) Set A (b) Set B (c) Set C (d) Set D

(i) A (ii) B (iii) C

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

34. A ray of light incident on one of the parallel faces of rectangular glass slab, emerges out of theopposite parallel face.(a) inclined towards the incident ray(b) along the same straight line as the incident ray(c) parallel to the incident ray(d) inclined away from the incident ray

(a)(b)(c)(d)

35. Out of the precantions given below which must be taken by a student while tracing the path oflight with the glass slab.(a) Range of incident angle should be 30 60

(b) The eye must be in line with the feet of the pins.(c) The alpins used must have sharp point and stand vertically on the board.(d) All the precautions given in (a), (b), (c).

(a) 30 60 (b)(c)(d) (a), (b), (c)

36. Daughter cells produced as a result of asexual reproduction in amoeba are :(a) exact copies of parent cell.(b) may not be exact copies.

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(c) dissimilar to parent cell.(d) one is like and one is unlike the parent cell.

(a)(b)

(c)(d)

37. The sequence shown below show the stages of :

(a) spare formation in Amoeba(b) formation of bud in Amoeba(c) formation of gametes in Amoeba(d) formation of daughter cells in Amoeba.

(a) (b)(c) (d)

38. Which out of the following sets of diagrams correctly depicts reproduction in amoeba andyeast ?

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

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

39. Following diagrams were drawn by four students A, B, C and D on having seen preparedslides of budding in yeast.

The correct diagram is :(a) A (b) B (c) C (d) D

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A, B, C D

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

40. Raisins are dehydrated :

(a) grapes (b) apples (c) groundnut (d) Peanuts

(a) (b) (c) (d)

41. If weight of dry raisin = w 1 g wt and of wet raisin = w 2 g wt. then the correct formula for

calculation of percentage of water absorbed by raisins is :

(a) 1 21

100w w

w(b) 2 1

1

100w w

w

(c) 12 1

100w

w w (d) 2 1

2

100w w

w

= w 1 g wt = w 2 g wt

= w1 g = w 2 g

(a) 1 21

100w w

w(b) 2 1

1

100w w

w

(c) 12 1

100w

w w (d) 2 1

2

100w w

w