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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 of

Central 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 other

material 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 action

criminal 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

67040

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SECTION-A /

1. Carbon does not form ionic compounds. Why ?

2. State the nature of the image formed on the retina of the human eye.

3. Select the biotic components of the environment from the following :-Fungi , soil , mango tree, temperature.

4. Why is the Government stressing upon the use of jute / cloth carry bags ?

/

5. (a) State the basis of classification of elements in the modern periodic table.(b) An element belongs to group 17 of the periodic table, how many electrons does it

have in its outermost shell ?

(a)

(b)

6. (a) An element X forms a chloride with formula XCl 3. The element X would most likelybe in the same group of the periodic table as - Na, Mg, Al, Ca

(b) How does the tendency to lose electrons change as we move from top to bottom in agroup ?

(a) X XCl3 X

Na, Mg, Al, Ca

(b)

7. Write two advantages of vegetative propagation. List two plants in which vegetative

propagation is practised for agricultural purposes.

8. State one function each performed by the following organs in human beings :

(a) Testes (b) Prostate gland

(a) (b)

9. An object is kept at a distance of 5cm in front of a convex mirror of focal length 10cm. Calculatethe position and nature of the image formed.

10cm 5cm

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10. Name the four parts labelled as 1, 2, 3 and 4 in the given diagram.

1, 2, 3 4

11. Draw ray diagram to show the formation of rainbow. State the main cause of its formation.

12. (a) Name two gases which are formed on the combustion of fossil fuels in insufficient air /oxygen.

(b) Burning of all coal and petroleum reserves may lead to global warming. What is thebasis of this statement ?

(a)

(b)

13. Mention the two aims of Chipko Movement?

14. (a) Give any two tests to identify whether a compound with formula C2H

4O

2is an acid.

(b) What happens when this compound reacts with ethanol in the presence ofconc. H2SO4 ? Name the product formed and write chemical equation for the reaction.

(a) C2H

4O

2

(b) H2SO4

15. Group 13 Group 17

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---A

BC-D

Giving reasons, explain the following :(a) Element A has larger atomic size as compared to that of D

(b) Element B has valance of one(c) Element C is a non metal

13 17

---A

BC-D

(a) D A

(b) B

(c) C

16. State the changes that take place in the uterus subsequent to implantation of young embryo ?

How does this embryo get nourishment inside the mothers body ?

17. In human beings, the statistical probability of getting either a male or a female child is 50:50.

Give reasons and explain with the help of diagram.

50:50

18. Differentiate between homologous and analogous organs. Give one example of each.

19. What are fossils? How is life of a fossil estimated ?

20. (a) Define power of a lens and write its S.I. unit.(b) A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it.

Where is the needle placed in front of the lens if image size is equal to the object size ?Also find the power of the lens.

(a) S I

(b) 50cm

?

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21. (a) A ray of light falls normally on an face of a glass slab. What are the values of angle ofincidence and angle of refraction of this ray.

(b) Light enters from air to a medium X. Its speed in medium X becomes

1.5 x 108 m/s. Speed of light in air is 3 x 108 m/s. Find the refractive index of mediumX.

(a)

?

(b) X X 1.5 x 108 m/s

3 x 108 m/s X

22. (a) Why do stars twinkle ? Explain.

(b) The sky appears dark to astronauts. Why ?

(a)

(b)

23. (a) What are unsaturated hydrocarbons ? Which one of the two saturated or unsaturatedhydrocarbons is more reactive ?

(b) Give name and identify the functional group present in the following compounds :

(i)

3 2 2 2CH CH CH CH CH

|

Br

(ii)

3 3CH C CH

O

||

(c) What are soaps ? Why do they form scum with hard water ?

(a)

(b)

(i)

3 2 2 2CH CH CH CH CH

|

Br

(ii)

3 3CH C CH

O

||

(c)

OR/

(a) Write a chemical equation to represent the following :(i) Hydrogenation of vegetable oil(ii) Combustion of alcohol(iii) Dehydration of alcohol

(b) Write two characteristics of a homologous series of organic compounds.

(c) Write electron dot structure to show bonding in ethene (C2 H4) molecule.

(a)

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(i)

(ii)

(iii)

(b)

(c) (C2 H4)

24. Name any four modes of reproduction used by single organisms.

With the help of a neat diagram explain the process of regeneration in Planaria. More

complex organisms cannot give rise to new individuals through regeneration. Why ?

OR/

Distinguish between pollination and fertilisation. Explain why, pollination may occur withoutfertilization but fertilisation will not take place without pollination.

Draw a neat diagram showing the process of pollination and fertilisation in a flowering plant

and label the following on it.

(i) Female germ cell (ii) Male germ cell

(iii) Ovary (iv) Pollen tube

(i) (ii)

(iii) (iv)

25. (a) Draw a ray diagram in each of the following cases to show the position and nature ofthe image formed when object is placed :(i) Between focus and center of curvature of a concave mirror.(ii) Between focus and pole of a concave mirror.(iii) Between center of curvature and infinity for a concave mirror.

(b) Give mathematical formulae for determining magnification produced by a sphericalmirror. What does m1 signify ? Identify the mirror that can produce it.

(a)

:

(i)

(ii)

(iii)

(b) m1 ?

OR/

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(a) State Laws of refraction.(b) A ray of light enters from a medium A into a slab made up of a transparent

substance B (as shown in the figure). Refractive indices of medium A and B are 2.42and 1.65 respectively. Complete the path of ray of light till it emerges out of the slab.

(a)

(b) A B

( )

A B : 2.42 1.65

A

SECTION - B /

26. An iron nail was kept immersed in aluminum sulphate solution. After about an hour, it wasobserved that(a) The colourless solution changes to light green.(b) The solution becomes warm.(c) Grey metal is deposited on the iron nail.(d) The solution remains colorless and no deposition is observed on iron nail.

27. Zinc granules were added to Zinc sulphate copper sulphate, aluminium sulphate and ironsulphate solution as shown below. A student would observes the deposition of metal on zincin beakers :

B

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

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

28. The odour of acetic acid resembles with that of

(a) rose. (b) burning plastic. (c) vinegar. (d) kerosene.

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

29. Ethanoic acid was added to washing soda solution and the gas evolved was tested with a

burning splinter. Which of the following four observations is correct ?

(a) The gas burns with a pop sound and the flame gets extinguished.

(b) The gas does not burn but the splinter burns with a pop sound.

(c) The flame extinguishes and the gas does not burn.

(d) The gas burns with a blue flame and the splinter burns brightly

(a)

(b)(c)

(d)

30. Common name of ethanoic acid is

(a) Acetic acid (b) Methanoic acid

(c) Propanoic acid (d) Methanol

(a) (b)

(c) (d)

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31. A student is to find the focal length of (i) a concave mirror (ii) convex lens by focussing the

image of a distant object on a screen. He will observe that the screen is on the same side as that

of the object in.

(a) both cases

(b) case (i) but not in case (ii)

(c) case (ii) but not in case (i)

(d) neither case (ii) nor in case (i)

(i) (ii)

(a)

(b) (i) (ii)

(c) (ii) (i)

(d) (ii) (i)

32. In an experiment to determine the focal length of a convex lens a student obtained a sharp

inverted image of a distant tree on the screen behind the lens. He then removed the screen and

looked through the lens in the direction of the tree. He will see.

(a) A blurred image on the wall.

(b) An erect image of the tree on the lens.

(c) No image as there is no screen.

(d) An inverted image of the tree at the focus of the lens.

(a)

(b)

(c)

(d)

33. Four students set up an apparatus consisting of a screen, concave mirror mounted on a stand

and meter scale to carry out measurements of focal length of a concave mirror as shown in

figures. A,B, C, and D given below. Best result will be obtained by student.

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

A, B, C D

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

34. Four students traced the path of a ray of light, from glass to air as given below. The correctpath of refracted ray is shown in

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

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

35. The two dots P1

& P2

shown in each of the following diagrams, I, II, III, IV denote the position

of two pins in respect of distance and direction for performing an experiment on tracing the

path of a ray of light passing through a rectangular glass slab. In which one of the followingfour cases, I , II, III and IV one is likely to get best result ?

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

I, II, III IV P1 P2

I, II, III IV

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

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36. Study the following figures related to binary fission in amoeba.

The very first event that occur in the binary fission in Amoeba is illustrated in __________.(a) A (b) B (c) C (d) D

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

37. Out of the four stages of binary fission in amoeba shown below, the stage at which nuclearfission and cytokineses are observed is shown in figure

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

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

38. Which of the following figures shows budding in yeast :-

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

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

39. A pinch of yeast was added to a glucose solution and left overnight in a warm place. Next daya drop of the suspension was observed on a slide under a microscope. The expected resultwould be :-

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

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

40. A student put five raisins each in two beakers A and B. Beaker A contained 50 ml of distilledwater and beaker B had 50 ml of saturated sugar solution. After sometime the student wouldobserve that

(a) raisins in beaker A were more swollen than those in beaker B.(b) raisins in beaker B were more swollen than those in beaker A.(c) raisins in both beakers A and B were equally swollen.(d) raisins in beaker A did not swell up at all.

A B, 50 ml

5

(a) A B

(b) B A

(c) A B

(d) A

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