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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 otherelectronic 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

67009

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7. Differentiate between self pollination and cross pollination, giving oneexample for each.

-

8. "Multicellular organisms cannot divide cell by cell". List two reasons tojustify this statement.

--

9. An object is placed perpendicular to the principal axis of a convex lens of focal length 15 cm.The distance of the object from the optical centre of the lens is 20 cm. Calculate the position ofthe image formed. Mention the nature of the image formed.

15 cm

20 cm

10. How do ciliary muscles of human eye help in focusing distant as well as near objects clearly.

11. (a) Mention any two natural phenomen which occur due to scattering of light.(b) What is Tyndal Effect ?

(a)

(b)

12. List two reasons to explain why there is need to use fossil fuels judiciously.

13. Write two advantages of water shed management.

14. The molecular formula of two organic compounds are C3H6 and C3H8.

(i) Which of the two is likely to show addition reaction and why ?

(ii) Write a chemical equation to show an addition reaction. State its use in vegetable gheeindustry.

C3H6 C3H8

(i)

(ii)

15. Give reasons for the following :(a) Metals have tendency to form cations.(b) Fluorine atom is smaller than chlorine atom.

(c) Non metals have tendency to gain electrons.

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(a)

(b)

(c)

16. Draw a diagram showing germination of pollen on stigma and label thefollowing

Pollen grain, stigma, male germ cell, pollen tube, ovary and female germcell.

:

, , , , ,

17. Briefly explain Mendel's findings with respect to :

(a) dominant and recessive characters.

(b) independent inheritence of traits.

( ) :

(a)

(b)

18. In the following crosses, write the characteristics of the progeny :

CROSS PROGENY

(a)

RrYy RrYy(b)

rryy rryy

(c)RRYY rryy

:

(a)RrYy RrYy

(b)rryy rryy

(c)RRYY rryy

19. Explain briefly with the help of an example how new species come up.Mention the two factors which are responsible for rise of new species.

20. (a) Define power of a lens. State its S.I. unit.(b) The power of a lens is +2.5 D. What is focal length and the type of lens ?

(a) S.I.

(b) +2.5 D

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21. (a) A ray of light travelling in air enters water normally. What are at the values of angle ofincidence and refraction of this ray ?

(b) Light enters from air into a glass slab of refractive index 1.50.

Calculate the speed of light in glass if speed of light in air is 3108 ms1.

(a)

(b) 1.5 3108

ms1

22. Study the diagram given below and answer the questions that follow it :

(i) Which defect of vision is represented in this case ? Give reason for your answer.

(ii) What could be the two causes of this defect ?(iii) With the help of a diagram show how this defect can be corrected by the use of a suitable

lens.

(i)

(ii)

(iii)

23. (i) Draw electron dot structure of methane molecule.(ii) Write the name of the following compounds :

(a)

(b) H C C H (iii) Name the carbon compound which when heated with conc. H2SO4 produces ethene. Write

chemical equation for the reaction. State the role of conc. H2SO4 in this reaction.(iv) Soaps do not work well with hard water. Why ?

(i)

(ii)

(a)

(b) H C C H

(iii) H2SO4

H2SO4

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(iv)

OR/

(i) State the meaning of an oxidizing agent.

(ii) What happens when an alkaline solution of KMnO4 is added to warm ethanol ? Writechemical equation to represent the above reaction.

(iii) Draw electron dot structure of CO2 molecule.

(iv) We are not able to check if water is hard while using detergents for washing clothes.Why ?

(v) Name the functional group present in the following compounds.

(i) CH3COOH (ii) CH3COCH3

(i)

(ii) KMnO4

(iii) CO2

(iv)

(v)

(i) CH3COOH (ii) CH3COCH3

24. (a) What is meant by asexual reproduction ? List four different methods of asexualreproduction.

(b) Describe in brief binary fission in amoeba.

(a) ?

(b)

OR/

State the function of ovary and uterus in human female reproductory system. How doesembryo get nourishment inside the mother's body ? What happens when the egg is notfertilized ?

? ?

25. For driving a car what type of mirror would you prefer to see the traffic at yourback ? Draw labelled ray diagrams to show image formation by the above mirror when theobject in front is placed(i) at infinity,(ii) between infinity and pole of the mirror.

(i)

(ii)

OR/

Name the type of mirror that should be used to obtain :

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(i) a diminished and virtual image of an object(ii) a magnified and virtual image of an object. Which of these mirrors could also form

magnified and real image of the object ? State the position of object for which this couldhappen.

Also draw labelled ray diagrams to show the image formation in case (i) and (ii) givenabove.

(i)

(ii)

(i) (ii)

SECTION - B /

26. Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed thatthe blue colour of the solution changes and a layer gets deposited on iron filings. The colour ofthe solution and that of the coating would respectively be :(a) yellow and green (b) brown and reddish brown(c) red and greenish-blue (d) pale green and reddish-brown

10

(a) (b)

(c) (d)

27. When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution takenin a test tube, the change which is observed is :(a) the green solution slowly turns brown.(b) the colour of the solution fades and finally becomes colourless.(c) a colourless gas with smell of burning sulphur is observed.(d) light green solution changes to blue and a grey deposit on aluminium metal.

(a)(b)

(c)

(d)

28. Pure acetic acid is known as glacial acetic acid because:(a) it is transparent like glass (b) it freezes in winter(c) it is colourless (d) it is found in glaciars

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

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29. 5 mL of acetic acid was added to 5 mL of water in a test tube. Which of the following diagramscorrectly depicts the mixture.

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

5 mL 5 mL

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

30. A student wants to observe the effect of acetic acid on litmus paper. He takes acetic acid in a testtube and successively puts red and blue litmus in it. He would observe that -(a) red litmus is turned blue(b) blue litmus is turned red

(c) blue litmus becomes colourless(d) red litmus becomes colourless

(a)

(b)

(c)

(d)

31. A student obtained a sharp image of the grill of a window on a screen, using a convex lens. Hethen tried to focus a distant tree instead of the grill. In which direction should the lens bemoved for this purpose ?

(a) Slightly away from the screen

(b) Very far away from the screen

(c) Behind the screen

(d) Towards the screen

(a) (b)

(c) (d)

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32. The image of a distant object is obtained on a screen by using a concave mirror. The focal lengthof the mirror can be determined by measuring the distance between :

(a) the object and the mirror

(b) the object and the screen

(c) the mirror and the screen

(d) the mirror and the screen as well as that between the object and the screen

(a)

(b)

(c)

(d)

33. Four students A, B, C and D were asked to focus a distant object by a convex lens to obtain itsfocal length. A focused the lighted bulb overhead in the laboratory, B, C and D respectivelyfocused grill of the window, a tree outside and the sun. Who will get the best result ?

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

A, B, C, D

A B, C, D

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

34.Four students A, B, C, D after performing the experiment to trace the path ofa ray of light through a glass slab, marked the direction of incident, refractedand emergent rays as follows

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The correct direction was shown by :

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

A, B, C, D

,

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(a) (b)

(c) (d)

39. A yeast cell in which budding occurs was observed to have :(a) only one bud cell (b) only two bud cells(c) only three bud cells (d) a chain of bud cells

(a) (b)

(c) (d)

40. The step(s) necessary for determining the percentage of water absorbed by raisins is/are :(a) raisins should be completely immersed in water(b) raisins should be soaked in water for sufficient time

(c) gently wipe dry the soaked raisins(d) all of the above steps

(a)

(b)

(c)

(d)

41. If 'x' is the initial weight of raisins and y is final weight of raisins (after soaking), the percentage

of water absorbed by raisins is :

(a) 100x y

x

(b) 100

x y

y

(c) 100y x

y

(d) 100

y x

x

'x' y

(a) 100x y

x

(b) 100

x y

y

(c) 100y xy

(d) 100y x

x

- o 0 o -