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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

67005

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SECTION-A /

1. Give the electron dot structure of CO2. 1

CO2 -

2. Write the colours which respectively bend least and most when white light passes

through a prism.

3. Why do man-made materials like plastics persist for a long time in our

environment?

4. A geographical area containing organisms like snake, grasshopper, peacock, grass

and frog. If pesticide was used in this area to kill insects, which among the

organism will contain maximum amount of pesticide ? Name the phenomenon

involved.

5. How and why does the valency of an element vary as you go :(a) from left to right along a period.(b) down the group ?

(a)

(b)

6. Account for the following :(a) All the elements of the same group have similar properties.(b) The noble gases were discovered very late.

(a)

(b)

7. List the two events during binary fission in amoeba.In which two of the following organisms, regeneration takes place ?Lion, planaria, hydra, lotus

8. (a) Which organ is responsible for implantation of zygote.

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(b) State two functions of fallopian tubes

(a)

(b)

9. Mention any two advantages of using a convex mirror for seeing traffic at the rear?

10. (i) Mention the role of crystalline lens in the human eye ?

(ii) How does the focal length of the eye lens change when we shift looking from

a nearby object to a distant object ?

(i)

(ii)

11. Explain with diagram why the sun is visible to us about 2 minutes before the actual

sun - rise.

2

12. Although coal and petroleum are produced by degradation of biomass, yet we need

to conserve them. Why ?

13. List any two causes for the failure of sustained availability of ground water.

14. Complete the following equations of chemical reactions : 3

(a)

(b)

(c)

:

(a)

(b)

(c)

3 2 5CH COOC H Na

3 3 2

2 4

,

CH COOH CH CH OH

conc. H SO

3 2 5CH COOC H Na

3 3 2H SO ,2 4

CH COOH CH CH OH

3 2 2 4 443 KCH CH OH conc. H SO

3 2 2 4 443 KCH CH OH H SO

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15. The elements of a period of the periodic table are given below in order from left toright with one of its element missing :

Li Be B C O F Ne(i) To which period do these elements belong ?(ii) One element of this period is missing. Which is the missing element and where

should it be placed ?(iii) Which one of these elements in this period shows the property of catenation ?(iv) Which one of the above elements belongs to the halogen series ?(v) Identify the noble gas.

Li Be B C O F Ne

(i)

(ii)

(iii)(iv)

(v)

16. Give a reason for each of the following :(a) Regeneration is not considered a method of reproduction.(b) Blocking of the fallopian tubes causes birth control.(c) Spores generally have a thick wall.

(a)

(b)

(c)

17. (a) Define Inherited traits.

(b) Inherited traits are capable of directing evolution. Justify the statement

and support your answer by giving two reasons.

(a)

(b)

18. Identify the diagram shown below in evolutionary point of view. How do these

organs provide evidence in favour of evolution ?

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19. Give reasons for your answer.(a) Define speciation. Mention the factors due to which this can happen.(b) Will geographical isolation be a major factor in the speciation of an asexually

reproducing organism ? Justify your answer with reason.

(a)

(b)

20. An object 5 cm high is kept 25 cm away from a convex lens of focal length 10 cm.What is nature, position and size of the image?

5 cm 10cm 25 cm

3

21. (i) Define power of a lens. Write the S.I unit in which power of lenses is stated ?

(ii) Which type of lens behaves as convergent lens and which are as a divergentlens ?

(iii) A convex lens has a focal length of 50 cm. Calculate its power.

(i) S.I

(ii)

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(iii) 50 cm

22. Make a diagram to show how hypermetropia is corrected. The near point of a

hypermetropic eye is 1 m. What is the power of the lens required to correct this

defect ? Assume that the near point of the normal eye is 25 cm.

1 m

25 cm

23. (i) An organic compound 'A' ( C2H4O2 ) is used for preserving pickles. 5

(a) Identify 'A' and give its structural formula.

(b) Write the chemical equation for the reaction of 'A'with sodium hydroxide.

(c) How does 'A' react with sodium carbonate ?

Give chemical equation of the reaction.

(ii) Mention any two uses of esters.

(i) 'A' (C2H4O2)

(a) 'A' (b) 'A'

(c) 'A' ?

(ii)

OR/

Explain the following reactions with examples, in reference to carbon compounds :

(a) Hydrogenation reaction.

(b) Oxidation reaction.

(c) Substitution reaction.

(d) Saponification reaction.

(e) Combustion reaction.

:

(a)

(b)

(c)

(d)

(e)

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24. (a) Draw diagram of a germinating seed and label the following parts of it :(i) Part that gives rise to shoot system(ii) Part that gives rise to root system(iii) Part that contains stored food

(b) How do potato and bryophyllum plants reproduce vegetatively ?

(a)(i)

(ii)

(iii)

(b)

OR/

(a) Draw a diagram illustrating fertilization in a flowering plant and labelstigma, anther, male germ cell, female germ cell.

(b) Describe the process of fertilization

(a)

(b)

25. (a) The refractive index of dense flint glass is 1.65 and for alcohol is 1.36 withrespect to air. What is the refractive index of dense flint glass with respect toalcohol?

(b) A 10 cm tall object is placed perpendicular to the principal axis of a convexlens of focal length 30 cm. The distance of the object from the lens is 20 cm.Find(i) position(ii) nature(iii) size of the image formed

(a) 1.65

1.36

(b) 30 cm 10 cm

20 cm

(i)

(ii)

OR/

(a) With the help of ray diagrams, show the formation of the images of an objectby a concave mirror when it is placed:(i) beyond the centre of curvature.(ii) at the centre of curvature.

(b) Define the term magnification as referred for spherical mirror. Express itmathematically. What is indicated by +ve and ve magnification.

(a)

(i)

(ii)

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(b)

SECTION - B /

26. A student dissolves some crystals of FeSO4 in water taken in a test tube. Thesolution so obtained appears :

(a) pale green (b) dark green(c) light blue (d) colour less

FeSO4

-

(a) (b)

(c) (d)

27. A student dip an aluminium strip in CuSO4 solution taken in a test tube. Aftersometime he observes that :

(a) no reaction has taken place.

(b) the colour of the solution turns pale green.

(c) the solution becomes colourless but no change appears on the surface ofaluminium strip.

(d) the solution becomes colourless and there is a reddish brown depositon the aluminium strip.

CuSO4

:(a)

(b) (c)

(d)

28. When the stopper of a bottle containing a colourless liquid was removed, the bottlegave out a smell like vinegar. The liquid in the bottle could be :

(a) HCl solution (b) CH3COOH solution

(c) NaOH solution (d) Soda solution

(a) HCl (b) CH3COOH

(c) NaOH (d)

29. 2 mL of acetic acid was added to 5 mL of water and the mixture was shaken for aminute. It was observed that :

(a) the acid formed a separate layer on the top of water.

(b) water formed a separate layer on the top of acid.(c) the milky solution appeared in the test-tube.

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(d) a clear and homogenous solution was formed.

5 mL 2 mL

(a)

(b)

(c)

(d)

30. On adding acetic acid to solid baking soda, a student observes the liberation of a :

(a) colourless, odourless gas

(b) greenish yellow gas

(c) colourless gas with rotten eggs smell

(d) colourless gas with smell of burning sulphur

(a)

(b)

(c)

(d)

31. A student was asked to identify merely by touching concave mirror from a few

mirrors lying on the table so as to find its focal length. The student picked up the

right mirror because its reflecting surface was -

(i) raised up at the centre(ii) uniformly plane

(iii) depressed at the centre

(iv) raised up at the centre and plane on the edges.

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

(a)

(b)(c)

(d)

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

32. A student obtained a sharp image of the grill of a window of laboratory on a screen

by using a convex lens. He then thought of focusing a distant tree outside the

window on the screen. In which direction should the lens be moved for this

purpose?

(a) Towards the screen

(b) Behind the screen

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(c) Away from the screen

(d) The distance between lens and screen be kept unchanged

(a)

(b)

(c)

(d)

33. A teacher suggested the following guidelines (not in proper sequence) to his

students for doing the experiment on finding the focal length of a given convex lens

by obtaining a sharp image of a distance object :

(i) Measure the distance between the lens and the screen

(ii) Adjust the position of the lens to form a sharp image

(iii) Select a suitable distant object

(iv) Hold the lens between the object and the screen with its faces parallel to the

screen.

The correct sequences of steps is

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

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

(i)

(ii)

(iii)

(iv)

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

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

34. Out of the four setups shown for carrying out experiment to trace the path of aray of light, through a rectangular glass slab, the best set up is :

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

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

35. Four students A, B, C and D traced the path of a ray of light passing through arectangular glass slab. They traced the incident ray and emergent ray as given in thefollowing diagrams.

The student who traced these rays correctly is :(a) A (b) B (c) C (d) D

A, B, C D

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

36. Among the figures given below, which of them shown binary fission ?

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

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

37. From the following diagrams, select the correct ones showing stages of binary fission

in amoeba and budding in yeast in their proper sequence :

(a) 7, 4, 1 and 3, 6, 8 (b) 7, 1, 4 and 3, 8, 6

(c) 7, 4, 1 and 3, 8, 6 (d) 4, 1, 7 and 2, 8, 6

(a) 7, 4, 1 3, 6, 8 (b) 7, 1, 4 3, 8, 6

(c) 7, 4, 1 3, 8, 6 (d) 4, 1, 7 2, 8, 6

38.Four students after observing slide of yeast culture under a microscopereached a conclusion that yeast is a unicellular fungus which reproducescommonly by :

1

(a) Fragmentation

(b) Spore formation

(c) Binary fission

(d) Budding

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A, B, C, D :

-

(a)

(b)

(c) (d)

39. Among the figures given below, which of them shows budding ? 1

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

-

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

40. A student soaked 2g of raisins in 10 mL of distilled water in two test tube A and B.

He maintained the temperature of A at 20C and B at 40C. After about an hour he

would observe that the percentage of water absorbed is :

(a) same in A and B (b) more in B than A

(c) just twice in B that of A (d) more in A than B

10 mL 2g A

20C B 40

C

(a) A B (b) B A

(c) B A (d) A B

41. While performing experiment a student finds that the mass of 3.2g raisins after

keeping them dipped in water for about an hour becomes 4.8g. On the basis of these

observations the percentage of water absorbed by raisins must be :

(a)

(4 8 3.2)g

1004 8 g

.

.

(b)

4 8 3.2) g

1003 2 g

( .

.

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(c)(4 8 3.2) g

1004 8 g

.

.

(d)

(3 2 4.8) g100

3 2 g

.

.

3.2g 4.8g

(a)(4 8 3.2)g

1004 8 g

.

.

(b)

4 8 3.2) g100

3 2 g

( .

.

(c)(4 8 3.2) g

1004 8 g

.

.

(d)

(3 2 4.8) g100

3 2 g

.

.

- o 0 o -