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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 ofCentral 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 othermaterial 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, 2012

II, 2012

SCIENCE /

Class X / X

Time allowed : 3 hours Maximum Marks : 80

3 80General 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 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

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SECTION-A /

1. Which two of the following compounds could belong to the same functional group ?

C2H6O2, C2H6O, C2H6, CH4O.

C2H6O2, C2H6O, C2H6, CH4O.

2. Mention the name of a structure found in human eye that controls size of pupil.

3. Name the two components of ecosystem.

4. Name the radiations absorbed by ozone layer in the atmosphere.

5. State moderns periodic law. On which side of the periodic table do you find(i) metals (ii) non-metals ?

(i) (ii)

6. The atomic radii of three elements A, B and C of a periodic table are 186pm, 104pm and 143pmrespectively. Giving a reason, arrange these elements in the increasing order of atomic numbers inthe period.

VrZ Vdm| A,, B VWmCH$s namUw {mH$e186pm, 104pm VWm143pmh& H$maU n> H$aVo hE BZ Vdm| H$mo AmdV| BZH$s namUw gm Ho$ AmamohrH$ | dpWV H$s{OE&

7. Mention any two advantages of using vegetative propagation for growing some types of plants ?

8. Differentiate between binary and multiple fission for reproduction. Give one example of each.

9. Define principal focus of a concave mirror. The distance between the centre of curvature and thepole of a concave mirror is 20 cm. Calculate the focal length of the mirror.

20 cm

10. (a) What is the least distance of distant vision for the normal eye?(b) Does the above distance increase or decrease for long-sighted eye? Give reason for your

answer with diagram.

(a)

(b)

11. Why danger signals are red in colour?What would have been the colour of sky if the earth had no atmosphere? Give reason for youranswer.

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12. Name four basic elements present in fossil fuels.

13. What important message is conveyed by Amrita Devi Bishnoi Award for wildlife conservation ?

14. An organic compound X is an essential constituent of wine and beer. X is responsible for

intoxication caused by these drinks. Oxidation of X yields an organic acid Y which is present in

vinegar. Name the compounds X and Y and write their structural formulae.

X X

X Y X Y

15. An atom has electronic Configuration 2, 8,2(a) What its the atomic number of this element ?(b) What is its Valency ?(c) To which of the following element would it be chemically similar and why ? (Atomic

numbers are given in parentheses) Be (4), O (8), justify your answer.

{H$gr namUw H$m BboQ>moZ {dmg2, 8,2h&(a)Bg Vd H$s namUwgm m h?(b)BgH$s gmoOH$Vm m h?(c)h amgm{ZH$ [> go ZrMo {XE JE {H$g Vd Ho$ gmZ h Ama m| ? (namUw) gm H$mo>H$ | XrJr h Be (4); O (8),

AnZo Cma H$s nw{> H$s{OE&

16. Distinguish between the functions of ovary and testis.

17. It is a matter of chance that a couple gives birth to a boy or a girl. Comment and support youranswer with a suitable illustration.

18. (a) Differentiate between homologous argans and analogous argaous(b) Define Heredity.

(a)

(b)

19. Look at the given picture and give a suitable caption to it. Also list its any two significance inconnection with evolution of life.

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20. (a) (i) Define magnification produced by a lens.(ii) For which position of the object, the magnification produced by a convex lens is

unity (one) ?(b) Is it correct to say that the magnification produced by a concave lens is always

positive ? Give reason.

(a) (i)

(ii)

(b)

21. (i) State the law of refraction of light.(ii) Suppose you cover one half of a convex lens with a black paper. State the change you

would observe in the image formed by this lens.

(i)

(ii)

22. (a) Draw a diagram to show the formation of image of a distant object by a myopic eye. Howcan such an eye defect be rectified ?

(b) State two reasons due to which this eye defect may be caused.

(a)

(b)

23. (a) What is a homologous series of organic compounds ? State any two characteristics of a

homologous series.

(b) What would be observed on adding 5% solution of alkaline potassium permanganate drop

by drop to some warm alcohol taken in a test tube ? Write the name of the compound

formed during the chemical reaction.

(c) Write a chemical test to distinguish between ethanol and ethanoic acid.

(a)

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(b) 5%

(c)

OR/

(a) What happens when hydrogen gas is passed through vegetable oil in presence ofnickel ? Mention one difference between physical property of vegetable oil and the product

so obtained.

(b) Write the structural formula of any two isomers of pentane (C5H12).

(c) Draw the electron dot structures for

(i) Propanone (CH3COCH3) (ii) Ethanoic acid (CH3COOH)

(a)

(b) (C5H

12)

(c) (i) (CH3COCH3) (ii) (CH3COOH)

24. (a) Draw a labelled diagram of female reproductive system.

(b) Explain what happens when the egg is not fertilized ?

(a)

(b)

OR/

(a) Draw the labelled diagram of male reproductive system.

(b) List any two reasons why the Government has banned prenatal sex determination by law.

(a)

(b)

25. (i) Draw neat ray diagrams to show the nature and size of image in the following cases :(a) Object is placed beyond C of a concave mirror.(b) Object is placed between C and F of a concave mirror.(c) Object is placed anywhere between infinity and the pole P of a convex mirror.

(ii) How does the size and position of image from the concave mirror vary, when an object

initially placed beyond C is moved towards the focus of mirror ?(i)

(a) C

(b) C F

(c) P

(ii) C

OR/

(i) The focal length of a spherical lens which always give a virtual, erect and diminished imageis 20 cm. What should be the position of an object so that this lens forms an image at a

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distance of 10 cm from the lens ? Draw the ray diagram for this case.(ii) The following table shows the nature and relative size of the image formed by a convex lens

for various positions of the object.

Relative size of the image Nature of the image

Diminished Real and Inverted

Highly enlarged Real and Inverted

Draw ray diagrams for the above mentioned cases.(i) 20 cm

10 cm

(ii)

SECTION - B /

26. Virender put a zinc plate in copper sulphate solution taken in a beaker. After sometime he wouldobserve that the colour of solution changes from :(a) Light green to colourless.(b) Light blue to colourless.(c) Light blue to light green.(d) Light green to light blue.

(a)

(b)

(c)

(d)

27. Solutions of ZnSO4 ,FeSO4 and Al2(SO4)3 are taken in four beakers. Plates of copper, iron and zinc

are placed in these solutions as shown in the figures-

In which of the above cases no change will be observed-

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

ZnSO4 ,FeSO4 Al2(SO4)3 (

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) ,

?

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

28. A student kept a bottle of acetic acid along with bottle containing Al2(SO4)3 solution. Which of the

following substances can he use to identify the bottle containing acetic acid ?

(a) NaOH (b) Na2CO3 (c) H2O (d) HCl

Al2(SO4)3

(a) NaOH (b) Na2CO3 (c) H2O (d) HCl

29. Which of the following test tube represents the complete reaction of Na2CO3 with Acetic acid ?

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

Na2CO3

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

30. The correct experimental set up for the reaction of Na2CO3 with CH3COOH is

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Na2CO3 CH3COOH

31. Meena focusses a distant tree on a screen with the help of a concave mirror. Her teacher asks herto describe nature and size of image. Correct description would be that image is -(i) virtual, inverted, smaller (ii) real, inverted, smaller(iii) virtual, erect, smaller (iv) real, erect, smaller(a) (i) (b) (ii) (c) (iii) (d) (iv)

(i) (ii)

(iii) (iv)

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

32. In an experiment to determine the focal length of a convex lens, a student obtained the image of adistant window on the screen. To determine the focal length of the lens, she should measure thedistance between the(a) lens and the screen only(b) lens and the window only(c) screen and the window only(d) screen and the lens and also between the screen and the window

(a) (b)

(c) (d)

33. A teacher asks Varuna to obtain a sharp image of distant object on the screen by choosingappropriate devices out of the following :(i) Concave mirror (ii) Convex lens (iii) Concave lensShe can successfully obtain image by using (a) a concave mirror only(b) a convex lens only(c) both either by concave mirror or by convex lens.(d) concave lens only

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(i) (ii) (iii)

(a)

(b)

(c)

(d)

34. A student traces the path of a ray of light passing through a rectangular glass slab for the angle ofincidence as 40 as shown. The refracted ray in the given diagram is

(a) PQ (b) QR (c) RS (d) EF

40

(a) PQ (b) QR (c) RS (d) EF

35. A student traces the path of a ray of light passing through a rectangular glass slab for the angle ofincidence as 30. What can be the measure of angle of refraction ?(a) 16 (b) 19 (c) 24 (d) 27

30

(a) 16 (b) 19 (c) 24 (d) 27

36. Shape of amoeba is(a) Regular (b) Ever changing(c) Regular as well as everchanging (d) Oval

(a) (b)

(c) (d)

37. In binary fission of Amoeba

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(a) Cytoplasm and nucleus divide at the same time.

(b) Cytoplasm divides first and followed by division of the nucleus.

(c) Neither Cytoplasm nor nucleus divide.

(d) Nucleus divides first followed by division of cytoplasm.

(a)

(b)

(c)

(d)

38. Four students A, B, C and D observed a slide of budding in yeast under a microscope. Followingdiagrams were drawn by them, after observing the slide.

The correct diagram is drawn by student/s :(a) A only (b) B only (c) C only (d) A and D

A, B, C D

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

39. Study the following sketches made by some students

The sketch illustrating budding in yeast correctly is

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

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

40. At the end of experiment to determine the percentage of water absorbed by raisins. The raisinsare wiped just before weighing. This is to ensure that :(a) hands do not get wet(b) the raisins lose water before weighing(c) the weighing scale does not get wet(d) only water absorbed by raisins is weighed.

(a)

(b)

(c)

(d)

41. While determining the percentage of water absorbed by raisins a student recorded the followingobservations :Mass of water taken in the beaker = 60 gMass of raisins before soaking = 10 g

Mass of raisin after soaking = 16 gMass of water left in the beaker after experiment = 53 gOn the basis of these observations the percentage of water absorbed by the raisins is :

(a) 60 53 g

10053g

(b)

60 10 g100

60g

(c) 16 10 g

10010g

(d)

16 10 g100

16g

60 g

10 g 16 g

53 g

(a) 60 53 g

10053g

(b)

60 10 g100

60g

(c) 16 10 g

10010g

(d)

16 10 g100

16g

- o O o -