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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

67003

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SECTION-A /

1. Complete the following reaction :

CH3COOHNaHCO3

CH3COOHNaHCO3

2. Why is a normal eye not able to see clearly the objects placed closer than 25 cm ?

25 cm

3. List two non-biodegradable wastes generated daily in kitchen which can be recycled.

4. State a way to prevent accumulation of harmful chemicals in our bodies.

5. Some of the elements and their atomic number are mentioned in the following table.Element Atomic number

P 3

Q 17

R 13

S 11

(i) How many valence electrons are there in the element R ?

(ii) What is the valency of P ?

(iii) Write the chemical formula of the compound formed by combining the elements P and

Q ?

(iv) Out of the two elements P and S, which one is larger in size ?

P 3

Q 17

R 13

S 11

(i) R

(ii) P

(iii) P Q

(iv) P S

6. Two elements X and Y belong to group 1 and 2 respectively in the same period. Compare them

with respect to :

(i) Metallic character

(ii) Formulae of their oxides and chlorides

X Y 1 2

(i)(ii)

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7. Differentiate between reproduction and regeneration. Name any two organisms which growby regeneration.

2

8. Differentiate between sexual and asexual reproduction. Write any two examples of asexualreproduction. 2

9. An object of 2cm height is kept in front of a convex lens which produces a magnification of 0.5.

Calculate the size of image. Will the image be erect or inverted ? Give reason for your answer.

2cm 0.5

10. What is meant by far point and near point of the human eye with normal vision ? State the

type of corrective lens which is required by a person who can neither see objects clearly at the

near point nor at infinity.

11. What is dispersion ? What happens when light is passed through a glass prism.

12. How are fossil fuels formed in nature ? What are the products formed when combustion takesplace in insufficient air ?

13. Rain water harvesting is essential. Justify this statement giving two reasons.

14. Why are vegetable oils called healthy as compared to vegetable ghee ? How are vegetable oils

converted into vegetable ghee ? Name the process.

15. An atom A has the electronic configuration 2, 8, 6.

(i) What is the atomic number of element A ?

(ii) Will it be larger or smaller in size than element B (Atomic number 14) ? Why ?

(iii) To which of the following elements would it be chemically similar ? Why ?O(8), C(6), N(7), Ar(18)

A 2, 8, 6

(i) A

(ii) B ( 14)

(iii)

O(8), C(6), N(7), Ar(18)

16. Explain vegetative propagation with the help of two examples. List two advantages of

vegetative propagation.

3

17. A husband has 46 chromosomes, his wife has 46 chromosomes. Then why don't their

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offspring have 46 pairs of chromosomes, which is obtained by the fusion of male and female

gametes ? Support your answer with a neat illustration.

46, 46

46

18. "Geographical isolation is not a major factor in the speciation of a self pollinating plant

species". Justify this statement with the help of an example.

19. (a) What is meant by evolution of a species ?

(b) List and describe any two evidences for evolution.

(a)

(b)

20. With the help of diagram differentiate between a converging and diverging lens. State one use

of a convex lens.

21. (i) Why does a ray of light bend from its path when it travels from one medium to other ?

(ii) Explain with the help of a diagram, why a pencil partly immersed in water appears to

be bent at the water surface.

(i)

(ii)

22. A student is not able to see clearly the questions written on the blackboard placed at a distance

of 5m from him.

(a) Name the defect of vision he is suffering from.

(b) With the help of labelled ray diagram explain in brief how this defect can be corrected ?

5 m

(a)

(b)

23. (i) Define homologus series of carbon compounds. List any two characteristics of a

homologus series.

(ii) How does ethanoic acid react with ethanol in the presence of conc. sulphuric acid as a

catalyst ? Write the chemical equation for this reaction. Mention the name of this

reaction.

(iii) What is glacial acetic acid ?

(i)

(ii)

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(iii)

OR/

(i) Name the process used for preparation of soap. Write the chemical equation involved in

this process.

(ii) Why are soaps ineffective in washing in hard water ?

(iii) Mention two properties of carbon which enable it to form largest number of compounds

?

(i)

(ii)

(iii)

24. How does the process of sexual reproduction takes place in flowering plants? Draw a labelleddiagram to explain the process.

5

OR/

Draw diagram of reproductive system of human female, label fallopian tube, uterus, cervix ofvagina. What is ovulation and when does it take place during menstrual cycle? Mention thename of organ where its fertilization may take place?

25. (a) Draw a ray diagram in each of the following cases when the object is placed.

(i) at the focus of a concave mirror.

(ii) between the focus and the centre of curvature of a concave mirror.(iii) at the centre of curvature of a concave mirror.

(b) Mention the advantage of using

(i) a convex mirror as a rear view mirror in vehicles.

(ii) a concave mirror in search lights.

(a)

(i)

(ii)

(iii)

(b)

(i)

(ii)

OR/

(a) Mention any two differences between real and virtual image.

(b) Draw ray diagrams to show the formation of a virtual image of an object by a convex

lens and a concave lens.(c) Define magnification produced by a lens. Draw the ray diagram for formation of image

by convex lens for which the magnification is equal to one.

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(a)

(b)

(c)

SECTION - B /

26. When you put an aluminium rod in FeSO4 solution, the observation made is :(a) the container becomes cold(b) the aluminium rod gradually starts dissolving.(c) green colour of ferrous sulphate solution becomes red.(d) a colourless gas is evolved which turns lime water milky.

FeSO4

(a)(b)

(c) FeSO4

(d)

27. Which one is observed when you add Zn, Fe and Cu pieces to three different test tubescontaining solutions of aluminium sulphate :(a) The solution is light green in the beginning.(b) Each test tube becomes hot after sometime.(c) A brown mass is deposited on the surface of each metal.(d) No change is observed.

Zn, Fe Cu

(a)

(b)

(c)

(d)

28. In the laboratory, a student went to pick up the bottle of acetic acid from shelf where threeother bottles too were lying. Labels of all the bottles were spoiled but on opening their caps oneby one, he got a pungent smell from one of them. The liquid in this bottle could be :

(a) ethanol (b) acetic acid(c) Solution of sodium bicarbonate (d) Lime water

(a) (b)

(c) (d)

29. Sodium bicarbonate solution is added to dilute ethanoic acid. It is observed that :

(a) a gas evolves(b) a solid settles at the bottom

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(c) the mixture becomes warm

(d) the colour of the mixture becomes light yellow

(a)

(b)

(c)

(d)

30. Neelima was asked to test the solubility of acetic acid. She added a smallamount of its crystals into water taken in a beaker. After some time sheobserved that :

(a) White precipitate was formed at the bottom.

(b) Crystals dissolved completely.

(c) Crystals settled at the bottom.

(d) gas was evolved with effervescence.

:

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

31. A student obtains a blurred image of a distant object on a screen by using a convex lens. In

order to obtain a sharp image on the screen, he will have to shift the lens.

(a) towards the screen

(b) a little 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)

32. Parallel rays, from a distant building, incident on the concave mirror, form its distinct image on

a screen as shown. A student was asked to find its focal length with the help of this

experiment. Correct measure will be :

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(a) 5.4 cm (b) 2.7 cm (c) 10.8 cm (d) 6.4 cm

(a) 5.4 cm (b) 2.7 cm (c) 10.8 cm (d) 6.4 cm

33. A teacher asks his student to do the experiment on finding the focal length of a given convex

lens by using a distant object for which they will need :

(a) a lamp and a screen (b) a lamp and a scale

(c) a scale and a screen (d) only a screen

(a) (b)

(c) (d)

34. A student traces the path of a ray of light passing through a rectangular glass slab. ForMeasuring the angle of incidence he must position the protractor (Dee) in the manner shown infigure

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

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(a) (A) (b) (B) (c) (C) (d) (D)35. The correct representation of i, r and e is illustrated in :

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

i, r e

(a) (A) (b) (B) (c) (C) (d) (D)36. A student after observing slide of amoeba showing binary fission makes the

observation about daughter cells produced as a result of asexual reproduction :

(a) are exact copies of parent cell.

(b) are dissimilar to parent cell.

(c) are such that one is like the parent cell and other cell is different.

(d) have no definite pattern.

(daughtercells) ?(a) (parent cell) (b) (c) (d)

37. A student was asked to arrange the following stages of binary fission ofamoeba in proper sequence :

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Correct sequence will be :

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

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

:(a) I, II, III, IV (b) III, I, II, IV

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

38. Following diagrams were drawn by four students on having seen preparedslides of budding in yeast.

The correct diagram is :(a) A (b) B

(c) C (d) D

-

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-(a) A (b) B

(c) C (d) D

39. A student observes a cell and another cell of comparatively smaller size

attached to the first cell. This slide could be that of :(a) yeast with bud

(b) amoeba with bud

(c) two daughter cells of amoeba

(d) two buds of yeast

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

40.A student soaked 10g of resins in 50 mL of distilled water in two beakers Aand B each. She maintains beaker 'A' at 25C and beaker 'B' at 50C. After anhour the percetage of water absorbed by resins will be :

1

(a) Same in both A and B

(b) More in A than in B

(c) More in B than in A

(d) Exactly twice as much in B as in A. 10g 50 mL A B

A 25C B 50C

-

(a) AB

(b) A B

(c) B A (d) B A

41.A student dissolved 2 g of sugar in 20 mL of distilled water in a beaker A. Hedissolved 20 g of sugar in 200 mL of distilled water in beaker B. Then hedropped a few resins in each. After two hours he found that the resins -

(a) Swollen in A and Shrunken in B

(b) Shrunken in A and Swollen in B

(c) Swollen in both

(d) Shrunken in both

2 g A 20 mL B 20 g

200 mL 2

-

(a) A B

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(b) A B

(c) (d)

- o O o -