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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

67013

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SECTION-A /

1. What are the characteristic features of carbon which accounts for its versatile nature?

2. A person is able to see objects clearly only when these are lying at distances between 50 cm and300 cm from his eyes. Name the kind of defects of vision he is suffering from ?

50 cm 300 cm

3.List two ways by which biodegradable substances would affect the environment.

?

4. Select from the following the substances which have posed a threat to theenvironment.

Aerosols, Consumers, bacteria, CFC's

:

, , , (CFCs)

5. An atom of an element has electronic configuration 2, 8, 5.(i) Is it metal or non-metal ? Give reason for your answer.(ii) To which of the following elements would it be chemically similar ? (Atomic numbers are

given in parentheses).N(7), F(9), Ar(18)

2, 8, 5(i)

(ii)

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

6. What is meant by electronegativity of an element ? How does it vary in a group of periodic

table ?

7. Observe the figure given below :

(i) Name the parts 1 and 2.(ii) State the function of a cotyledon in a seed.

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(i) 1 2

(ii)

8. State in brief the role of following parts of human male reproductive system :

(i) Seminal vesicles

(ii) Prostate glands

(i)

(ii)

9. Define the term magnification as referred for spherical mirrors. If a mirror produces amagnification of 3 when object is placed at a distance of 20 cm from the mirror, findthe position of the image.

20 cm

3

10. Describe the phenomenon of dispersion of light ? Name in sequence the colours of spectrum inwhich they are obtained.

11. Explain why do the stars twinkle but moon does not.

12. Mention the reason due to which coal and petroleum are called fossil fuels. Why theircomplete combustion may lead to global warming ?

?

13. How are different stakeholders dependent on forests ? Mention any four of them.

?

14. (a) What is meant by hydrogenation of carbon compounds? State the role of catalysts in areaction and name the catalyst used in hydrogenation of carbon compounds.

(b) Write the difference between the carbon chains of vegetable oils and animal fats.

(a)

(b)

15. (i) State Modern Periodic law.

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(ii) Mention one property each of elements in a group and of elements in a period in Modern

Periodic Table.

(iii) What is the number of valence electrons in Magnesium and sulphur whose atomic numbers

are 12 and 16 respectively.

(i)

(ii)

(iii)

12 16

16. Illustrate regeneration in Planaria with the help of suitable diagrams. What is the significance of

this type of reproduction ?

17. How is sex of a new-born child determined genetically in human being ? State in short the

reason of variation in human beings.

18. What are homologous and analogous organs ? State one example for each.

19. What are acquired traits ? How do Mendels experiment show that traits may be dominant orrecessive ?

20. An object of size 2 cm is placed at a distance of 40 cm from a convex lens. If the imageis obtained on a screen placed at a distance of 80 cm from the lens. Find :

(i) focal length of the lens

(ii) size of the image

(iii) nature of the image

2 cm 40 cm

80 cm

(i)

(ii)

(iii)

21. (i) An object is placed at a distance 'u' from a lens of focal length 'f'. Image is formed at adistance 'v' from the lens. Write the relation between u, v andf.

(ii) Image of an object placed at a distance of 20 cm from a concave lens is formed at adistance of 10 cm from the lens. What is the power of the lens ?

(i) 'f' 'u' 'v'

u, v,f (ii) 20 cm 10 cm

?22. (i) A person is unable to read the newspaper clearly. Which defect of vision is he

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suffering from ?

(ii) State two causes of this defect of vision.

(iii) How can this defect be corrected ? Illustrate your answer by drawing ray diagramto show the formation of image by an eye corrected with a suitable lens.

(i)

(ii)(iii)

23. (a) An organic compound A having molecular formula C2H4O2 reacts with sodium metaland evolves a gas B which readily catches fire. A also reacts with ethanol in the

presence of conc H2SO4 to form sweet smelling substance C used in makingperfumes :(i) Identify the compounds A, B and C and write their names.(ii) Write balanced chemical equations to represent conversion of

(A) compound A into compound B(B) compound A into compound C

(b) Write the chemical composition of detergents. Mention their advantage over soap forwashing clothes?

(a) A, C2H4O2

B A H2SO4

C

(i) A, B, C

(ii)

(A) A B

(B) A C

(b)

OR/

(a) What are hydrocarbons? Give one example.(b) Give the structural differences between saturated and unsaturated hydrocarbons with two

examples each.(c) What is a functional group? Give examples of two different functional groups.

(a)

(b)

(c)

24. (i) What is fertilization ?

(ii) Distinguish between external and internal fertilization.

(iii) What is the site of fertilization in human beings ?

(iv) List two differences between the mode of reproduction in human beings and the mode of

reproduction in Amoeba.

(i)

(ii)

(iii)

(iv)

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OR/

(i) Draw the given diagram on your answer sheet and label the parts marked 1 to 5.

(ii) State the function of (a) stigma, (b) pollen tube.

(iii) What happens to the ovule after fertilization ?

(i) 1 5

(ii) (a) (b)

(iii)

25. (a) What is the nature of the image formed by convex mirror ?

(b) Find the position of the image formed by a convex mirror of focal length 20 cm when theobject is placed 20 cm in front of the mirror.

(c) Mention any two uses of concave mirror and one use each of plane mirror and convexmirror.

(a) ?(b) 20 cm 20 cm

(c) -

OR/

(a) What is the nature of the image formed by a concave mirror if the magnification producedby the mirror is 3 ?

(b) An object is kept at a distance of 5 m in front of a mirror, which forms its erect image at adistance of 1 m from the mirror. Calculate the magnification. What type of mirror isbeing used here ?

(c) Speed of light in glass is 2108 m/s and its refractive index is 1.5. What is the speed oflight in a medium whose refractive index is 4/3 ?

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(a) 3

?(b)

5 m 1 m

(c) 2108 m/s 1.5 4/3

SECTION - B /

26. To show experimentally that zinc is more reactive than copper, the correct procedure is to :

(a) prepare copper sulphate solution and dip zinc strip into it.

(b) prepare zinc sulphate solution and dip copper in it.

(c) heat zinc and copper strip.

(d) add dilute nitric acid on both the strips.

(a)

(b)

(c)

(d)

27. Four strips labelled A, B, C and D along with their corresponding colours are shown below.Which of these could be made up of aluminium ?

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

A, B, C D

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

28. In a litmus test a student would observe that acetic acid turns :

(a) blue litmus red (b) red litmus blue(c) blue litmus colourless (d) red litmus colourless

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(a) (b)

(c) (d)

29. On adding acetic acid to sodium hydrogen carbonate a student observes that a gas is evolvedwhich turns lime water milky. This is due to the formation of :(a) Calcium bicarbonate (b) Calcium hydroxide(c) Calcium carbonate (d) Calcium acetate

(a) (b)

(c) (d)

30. The odour of acetic acid is similar to that of :(a) ethanol (b) onion (c) rotton egg (d) vinegar

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

31. A sharp image of a distant tree is obtained on a screen by using a convex lens. In order to

determine the focal length of the lens, you need to measure the distance between the

(a) lens and the object (b) lens and the screen

(c) object and the screen (d) object and the screen and also lens and the screen

(a) (b)

(c) (d)

32. A student obtains a blurred image of an object on a screen by using a concave mirror. In order toobtain a sharp image on the screen, he will have to shift the mirror(a) towards the screen(b) slightly away from the screen(c) either towards or away from the screen depending upon the position of the object(d) to a position very far away from the screen.

(a)

(b)

(c)

(d)

33. A teacher wants to demonstrate an experiment on finding focal length of a convex lens. Hewould select one of the following options as an object for the better result.(a) Object at a distance of 50 cm from lens.

(b) Grill on the window of the lab(c) A distant tree(d) A bulb on the wall of the lab

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(a) 50 cm

(b)

(c)

(d)

34. Four students A, B, C and D traced the path of a ray of light through a rectangular glass slab andmarked angles i , r and e respectively as shown below. Whose observation is correct :

(a) A and B (b) B and C (c) only B (d) A and C

A, B, C D

i , r , e

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

35. A student carries out the experiment of tracing the path of a ray of light through a rectangularglass slab. The conclusion she should be making regarding the angles of incidence, refractionand emergence i , r and e is :(a) ie and i > r (b) er and i > r(c) ei and i < r (d) re and r < i

(

i ), ( r ) ( e )

(a) ie i > r (b) er i > r

(c) ei i < r (d) re r < i

36. A student observes binary fission in amoeba. On the basis of his observation he may concludethat the binary fission in amoeba starts with the :(a) constriction of its cell membrane(b) elongation of its nucleus(c) bulb like projection in the parent body(d) two amoebae coming closer to each other

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(a)

(b)

(c)

(d)

37. The correct diagram showing an Amoeba undergoing binary fission is :

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

(a) (I) (b) (II) (c) (III) (d) (IV)38. The budding in yeast is illustrated by the diagram :

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

(a) A (b) B (c) C (d) D39. Two of the following four figures that illustrate budding are :

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

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

40. For taking the final weight of soaked raisins which of the following should be used to dry themup to remove extra water.(a) keep in open sunlight(b) by wrapping in fitter paper(c) heating in oven(d) heating in water bath

(a)

(b)

(c)

(d)

41. To determine the percentage of water absorbed by raisins, raisins with stalk are neededbecause :(a) stalked raisins can be easily picked up through forceps to get final weight.(b) stalk with vascular tissue provides necessary nutrients to raisin

(c) Through stalks excess water can be removed from raisins exterior(d) In stalkless raisin cell wall & cell membrane may be damaged.

(a)

(b)

(c)

(d)

- o 0 o -