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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

67008

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SECTION-A /

1. The structural formula of an ester is :

Write the molecular formula of alcohol and acid from which it would have been formed.

2. A person is advised to wear spectacles with convex lenses. What type of defect of vision is hesuffering from ?

3. List any two artificial ecosystems.

4. In a food chain comprising, Tiger, Plants, and Goat, which will :

(a) transfer the maximum amount of energy ?

(b) receive minimum amount of energy ?

(a)

(b)

5. Give any two changes in the properties of I-group elements of modern periodic table as wemove downwards along the group..

6. Write reason for the following (Number in parenthesis is atomic number of the substance)(i) Lithium (3) and Sodium (11) are considered as active metals.(ii) Fluorine (9) is more reactive than chlorine (17).

(i) (3) (11)

(ii) (17) (9)

7. (a) Name the process by which transfer of Pollengrains transfer from anther to stigma.Mention any one external agent which performs this process in some flowers.

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(b) Differentiate between its two types. Give one example for each.

(a)

(b)

8. (a) Name the organ which helps in providing nutrition to embryo. Where is it located ?(b) What causes the delivery of child from mothers uterus.(a)

(b)

9. A concave mirror produces four times magnified real image of an object at 10 cm in front of it.

Find the position of image ? Is it erect or inverted ?

10 cm

10. (a) What will be colour of the sky in the absence of atmosphere ?(b) Why the traffic light stop signals are of red colour ?

(a)

(b)

11. (a) What is meant by power of accommodation of the eye ?(b) How does the focal length of the eye lens change when we shift looking from a nearby

object to a distant object ?

(a)

(b)

12. What changes can you make in your habit to become more environment friendly ? Mentionany 2 important points.

13. Mention any two benefits of water harvesting.

14. (i) What are hydrocarbons ? Give a chemical test to distinguish between saturated and

unsaturated hydrocarbons.

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(ii) What happens when ethane is combusted in the presence of air ? Write chemical

equation for the reaction.

(i)

(ii)

15. An element A on combining with O2 produces an oxide A2O which is basic in nature.(a) How many electrons must be there in the outermost shell of the

elements A ?(b) To which group of periodic table it belongs?(c) Identify whether it is metal or non-metal?

A O2) A2O

(a) A

(b) A

(c) A

16. (a) Name any sexually transmitted disease which is

(i) caused by virus

(ii) caused by bacteria

(b) What may be the possible reasons for adopting contraceptives for sex ? Mention any

two.

(a)

(i)

(ii)

(b)

17. Define evolution. Why are traits acquired during the life time of anindividual not inherited ? State two reasons.

? 18. What are fossils ? State in brief two ways to decide how long the organisms

were alive.

?

19. "The sex of a new born child depends on its father and not on its mother".Justify this statement with the help of a flow chart.

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20. i) The refractive index of rock salt is 1.54. What is the meaning of this statement ?

(ii) Draw the ray diagram for light incident normally on the surface of glass slab. What is

the value of the angle of incidence and angle of refraction, in this case.

(i) 1.54

(ii)

21. Define S.I unit of power of a lens. You are provided with two convex lenses of focal length

25 cm and 50 cm respectively. Which lens will you use to obtain more convergent light. Justify

your answer, with a ray diagram (for drawing diagram you may choose a scale to represent

5cm by 1cm).

S.I 25 cm 50 cm

5cm

1cm

22. A child sitting in class room is not able to read clearly the writing on the blackboard. Name thedefect of vision the child is suffering from. How can it be corrected ?Draw ray diagrams for (i) defective eye (ii) its correction.

(i) (ii)

23. (i) Why do carbon atoms not form ionic bonds in its compounds ?

(ii) Complete and balance the following chemical reactions :

(a)Palladium

2 2 2CH CH H

(b)Sunlight

4 2CH Cl (iii) Give a chemical test to distinguish between an alcohol and carboxylic acid.

(iv) Write the name of the next homologue of HCOOH.

(i)

(ii)

(a) 2 2 2CH CH H

(b) 4 2CH C l

(iii)

(iv) HCOOH

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OR/

(i) What is saponification ?

(ii) What are structural isomers ? Draw the possible isomers of butane C4H10.

(iii) Explain the cleansing action of soap and detergents.

(i)

(ii) C4H10

(iii)

24. (i) Draw a labeled diagram of human male reproductive system.(ii) Mention the function of testes. Where are they located ?(i)

(ii)

OR/

(a) How do the following contraceptives prevent pregnancy

(i) Oral Pills(ii) Condom(b) Mention the possible misuse of surgical method of birth control by some people. How is

this misused method causing harm to the society ? State the step taken by thegovernment to prevent this misuse.

(a)

(i)

(ii)

(b)

25. (i) An object is placed at a distance of one and a half time of the focal length of a convexlens. Find the position of image in terms of f. Also find the magnification and natureof image formed by this lens.

(ii) Draw a labelled ray diagram to show the formation of the required image in the abovecase.

(i) (f) (1) f

(ii)

OR/

(i) Name the type of mirror which forms.(a) a virtual and diminished image of an object.(b) A virtual and enlarged image of an object.

Draw ray diagram to show formation of image in above two cases.(ii) Calculate at what distance should the object be placed from a convex mirror of focal

length 20 cm so that it forms an image at 10 cm on the back side of the mirror. Find themagnification produced by the mirror in this case.

(i)

(a)

(b)

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(ii) 20 cm

10 cm

SECTION - B /

26. Solutions of ferrous sulphate, zinc sulphate, copper sulphate and aluminium sulphate wereseparately taken in four test tubes and some iron nails were placed in each of the solutions.After few minutes, it would be observed that the colour of :

(a) all the four solutions changed.

(b) solutions of zinc sulphate, copper sulphate and aluminium sulphate changed andthat of ferrous sulphate did not change.

(c) solutions of zinc sulphate and aluminium sulphate only changed.

(d) copper sulphate solution only changed.

(a)

(b)

(c)

(d)

27. Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed thata layer gets deposited on iron filings. The colour of the coating would be :

(a) green (b) blue(c) greenish-blue (d) reddish-brown

10

(a) (b)

(c) (d)

28. When the stopper of a bottle containing a colourless liquid was removed, the bottle gave out a

smell like that of vinegar. The liquid in the bottle could be :(a) hydrochloric acid

(b) sodium hydroxide solution

(c) acetic acid

(d) saturated sodium bicarbonate solution

(a)

(b)

(c)(d)

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29. In which of the following cases the gas on evolution extinguishes a burning matchstick ?

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

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

(a) III IV (b) I II

(c) I III (d) II IV

30. Select correct statement about acetic acid :

(a) It smells like vinegar and turns red litmus blue

(b) It smells like vinegar and turns blue litmus red

(c) It smells like lemon and turns blue litmus red(d) It smells like orange and turns red litmus blue

(a)

(b)

(c)

(d)

31. In order to find the focal length of concave mirror, image of a distant object isobtained on the screen. Focal length of the mirror can be obtained bymeasuring 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.

-

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(a)

(b)

(c) (d)

32. Following apparatus are made available for finding the focal length of aconvex lens.

A. A stand with metal needle fixed in it

B. A stand with the given convex lens fitted in it

C. A thick white card board screen

D. A metre scale

A student can do experiment by using the apparatus listed as :

(a) A, B, C

(b) B, C, D

(c) C, D, A

(d) D, A, B

-

A. (needle)

B.

C. D.

-

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

(c) C, D, A

(d) D, A, B

33. Four students A, B, C, D while determining focal length of a convex lens letthe light from a distant object pass through a convex lens (focal length 'f')and their respective observation as recorded are that :

(A) Converges at focus

(B) Appears to diverge from focus(C) Converges at 2f

(D) Appears to diverge from 2f

Which student has made correct observation :

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

A, B, C, D

: -

(A)

(B)

(C) 2f

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(D) 2f

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

34. While performing the experiment to trace the path of a ray of light through aglass slab, four students A, B, C, D have drawn emergent ray for the sameincident ray PQ as RA, RB, RC and RD respectively :

Which of the students has drawn emergent ray correctly ?

(a) A (b) B

(c) C (d) D

A, B,

C, D PQ RA, RB, RC, RD

?(a) A (b) B

(c) C (d) D

35. While performing experiment to trace ray of light through a glass slab a student is askedto draw the boundary of glass slab on the paper. This is done to :

(a) see whether it is rectangular or not ?

(b) ensure that it is always kept within this boundary during experiment.(c) check if it is broken from edges.

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(d) make the diagram more clear.

:

(a) ?

(b)

(c) (d)

36. The diagram given below illustrates :

(a) bud formation in yeast

(b) binary fission in Amoeba(c) formation of daughter cells in yeast(d) pseudoposida formation in Amoeba

(a)

(b)

(c)

(d)

37. In order to adjust the compound microscope for observing binary fission in amoeba usingprepared slides, the following steps are required. However these steps are not in propersequence :(I) Place the slide on the stage(II) Focus the object using low power(III) Adjust the mirror and diaphragm so that sufficient light enters into the microscope(IV) Adjust to high powerThe correct sequence of these steps is :

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

(I)

(II)

(III)

(IV)

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

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38. The correct sequence of stages of binary fission in amoeba is :

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

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

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

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

39. The following are the sketches made by some students :

The sketch not illustrative of budding in yeast is :

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

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

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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 40C

(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

1004 8

.

.

(b)

4 8 3.2100

3 2

.

.

(c)4 8 3.2

1004 8

.

.

(d)

3 2 4.8100

3 2

.

.

3.2g

4.8g

(a)4 8 3.2

1004 8

.

.

(b)

4 8 3.2100

3 2

.

.

(c) 4 8 3.2 1004 8

..

(d) 3 2 4.8 1003 2

..

- o 0 o -