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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

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SECTION-A /

1. Draw the electron dot structure of ethene molecule (C2H4).

(C2H4)

2. What is meant by least distance of distinct vision of a normal human eye ? Give its value.

3. Mention the harmful effect of UV radiations. Name the gas which protects us from it.

UV

4. Differentiate between producers and consumers in a food chain. Give one example of each.

5. Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the

Periodic Table. Write the electronic configuration of these elements. Which of these will bemore electronegative and why ?

( 7 ) ( 15 )

6. Given below are three elements of Modern Periodic Table with their atomic number inparenthesis :

Li (3), Na (11), K(19)(i) What is the number of valence electrons in each of these elements ? Write electronic

configuration of each.(ii) On the basis of above information about valence electrons what should be the group

number to which these belong ? Give reason for your answer.

Li (3), Na (11), K(19)

(i)

(ii)

7. Mention any two advantages of vegetative propagation. Give any two examples of plants

which are propagated using this method.

8. Give reasons for the following :

(a) Regeneration is not same as reproduction.

(b) Sperms are tiny bodies with long tail.

(a)

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(b)

9. The focal length of a lens is 20 cm. Calculate its Power. What is the nature of the lens ?

20 cm

10. Why is the colour of the clear sky blue ? What would be the colour of sky if earth had noatmosphere ?

11. Draw a ray diagram to illustrate hypermetropia or far-sightedness. How is it corrected byusing spectacles fitted with convex lenses ? Draw a ray diagram to explain it.

12. Suggest any two different ways by which, our consumption of fossil fuels can be reduced ?

13. Mention any four harms of destruction of forests.

14. (a) What are hydrocarbons ? Give one example.

(b) Mention the structural difference between saturated and unsaturated hydrocarbons.

Write two examples of each.

(a)

(b)

15. (i) An atom has electronic configuration 2 , 8 , 7. What is the atomic number of this element ?To which of the following elements would it be chemically similar ?[N(7), F(9), P(15), Ar(18)]

(ii) How would the tendency to gain electrons change as you go from left to right across aperiod ?

(i) 2 , 8 , 7

[N(7), F(9), P(15), Ar(18)]

(ii)

16. Draw a neat diagram showing longitudinal section of a flower and label anther, Ovary, petal,

stigma, sepal and filament.

17. Explain various factors which could lead to the formation of new species.

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18. (a) What are Fossils ?(b) Explain various ways of estimating the age of fossils.

(a)

(b)

19. (a) Name any four varieties of vegetables which have been produced from wild cabbage

by the process of artificial selection.(b) Give one example of an evolutionary change produced in an organism for one purpose

which later on become more useful for different functions.

(a)

(b)

20. (i) Define magnification produced by a lens. What does the negative sign of magnificationsignify ?

(ii) An object placed 30 cm from a lens forms an image on a screen placed 60 cm on the

other side of the lens. Identify the type of the lens and find its focal length.(i)

(ii) 30 cm 60 cm

21. A coin is kept at the bottom of an empty bucket. A student standing near to it cannot see thecoin. Another student pours some water into the bucket without disturbing the coin. Now thefirst student is able to see the coin from the same position.Explain how it became possible to see the coin now ? Draw a ray diagram to illustrate it.

22. (i) State two main causes due to which a person may develop nearsightedness or myopia.With the help of a ray diagram, suggest how this defect can be corrected ?

(ii) The far point of a myopic person is 100 cm. Calculate the power of a lens required toenable him to see distant objects clearly.

(i)

(ii) 100 cm

23. Explain the cleansing action of soaps. The synthetic detergents are better cleansing agents

than the soaps. Justify the statement.

OR/ (a) State the main product formed in each of the following reactions of ethanoic acid with

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(i) ethanol in the presence of concentrated sulphuric acid.

(ii) sodium hydroxide.

(iii) sodium carbonate.

Also write the balanced chemical equation for each reaction.

(b) Name the product formed when ethanol is heated at 443 K with excess of concentrated

sulphuric acid, State the role of sulphuric acid in this reaction. Write chemical equation

of this reaction.

(a)

(i)

(ii)

(iii)

(b) 443 K

24. (a) Write the role of Ovary, Placenta and Fallopian tube in human female reproductive

system.

(b) What happens when the egg is not fertilised in a female reproductive organ ? Explain.

(a)

(b)

OR/

(a) Differentiate between unisexual and bisexual flower with an example of each.

(b) Draw a neat diagram showing germination of Pollen on stigma and label Pollen tube,

male and female germ cell and Ovary. With the help of this diagram explain the process

of germination.

(a)

(b)

25. (i) Complete the following ray diagrams. Also mark the angle of incidence and angle ofreflection in each case.

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(ii) A concave mirror forms an inverted image of size double than that of object. The focallength of the mirror is 15 cm. Find the position of the image and object.

(iii) Mention one use of concave and convex mirrors

(i)

(ii) 15 cm

(iii)

OR/

(i) Draw ray diagrams to show the image formation for the following cases :(a) Object placed between the principal focus and centre of curvature of a concave

lens.(b) Object placed at 2F of a convex lens.(c) Object placed between O and F of a convex lens.

(ii) A concave lens of focal length 20 cm forms an image of an object at a distance of 10 cmfrom the lens. Find the position of the object. Also mention the nature of the image.

(i)

(a)

(b) 2F

(c) O F

(ii) 20 cm 10 cm

SECTION - B /

26. The correct statement about the following solutions you use in your laboratory :

(a) FeSO4 solution is light green whereas CuSO4 solution is dark green.

(b) CuSO4 solution is blue whereas FeSO4 solution is dark blue.

(c) ZnSO4 and Al2(SO4)3 solutions are colourless.

(d) FeSO4 and Al2(SO4)3 solutions are colourless.

(a) FeSO4 CuSO4

(b) CuSO4 FeSO4

(c) ZnSO4 Al2(SO4)3

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(d) FeSO4 Al2(SO4)3

27. Which one is observed when you dip Zn, Fe and Cu plates in to three different test tubes

containing aluminium sulphate solution ?

(a) The solution changes from colourless to light green.(b) A brown mass is deposited on the surface of each metal.

(c) Each test tube becomes hot after sometime.

(d) No change occurs.

Zn, Fe Cu

(a)

(b)(c)

(d)

28. Asif mix 5 mL of acetic acid with 5 mL of water in a test tube. The resulting mixture is correctly

represented in the diagram.

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

5 mL 5 mL

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

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29. A student adds solid sodium bicarbonate to acetic acid in a test tube. He would observe

that :

(a) a blue coloured solution is obtained

(b) a gas is evolved with brisk effervescence

(c) a white precipitate is obtained

(d) the mixture turns milky.

(a)

(b)

(c)

(d)

30. A student tested the effect of acetic acid on litmus paper. He observed that :

(a) blue litmus turned red.

(b) blue litmus became colourless.

(c) red litmus turned blue.

(d) red litmus became colourless.

(a)

(b)

(c)

(d)

31. The focal length of a convex lens shown below equals

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(a) 41 cm. (b) 40 cm. (c) 20 cm. (d) 60 cm.

(a) 41 cm. (b) 40 cm. (c) 20 cm. (d) 60 cm.

32. The least count of the scale used in the fig. shown in Q. No. 31 is (a) 2.0 cm (b) 0.01 cm (c) 0.2 cm (d) 0.05 cm

31

(a) 2.0 cm (b) 0.01 cm (c) 0.2 cm (d) 0.05 cm

33. Pratap focussed a tree just outside the window of laboratory with the help of convex lens so asto find its focal length. Nitin wants to perform the same experiment by focussing a tree nearschool gate. For this purpose he shall have to move the screen (a) towards the lens(b) away from lens(c) towards the tree while keeping it between lens and tree(d) away from tree while keeping it between tree and lens.

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(a) 40 (b) 30 (c) 50 (d) 90

(a) 40 (b) 30 (c) 50 (d) 90

36. The diagram given below illustrates :

(a) binary fission in amoeba(b) bud formation in amoeba(c) formation of daughter cells in yeast(d) binary fission in yeast

(a)

(b)

(c)

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(d)

37. A slide is showing binary fission in amoeba. What should a student look for :(a) An amoeba with elongated nucleus and a constriction in the middle.(b) One small and other large daughter cells.(c) An amoeba with many pseudopodia and a large nucleus.

(d) A round structure with round nucleus.

(a)

(b)

(c)

(d)

38. In the figure of budding in yeast given below, structures A, B, C and D should be labelledrespectively as :

(a) Nucleus of bud, bud, yeast, nucleus of yeast.(b) Dividing nucleus of bud, bud, yeast nucleus of yeast.(c) Nucleus of bud, bud, yeast dividing nucleus of yeast.(d) Dividing nucleus of yeast, yeast, bud, nucleus of bud.

A, B, C D

(a)

(b)

(c)

(d)

39. Study the following diagrams which were drawn by different students after observing slides ofbudding in yeast. Select the one which depicts the budding correctly.

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

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

40. Weight of dry raisins x g.Weight of soaked raisins y g.The correct formula to determine of water absorbed by raisins would be -

(a) 100x y

y

(b) 100

y x

x

(c) 100

x

x y

(d) 100

y

x y

x g.

y g.

(a) 100x y

y

(b) 100

y x

x

(c) 100

x

x y

(d) 100

y

x y

41. A student took 50 mL of distilled water in two beakers A and B and soaked 5g of raisins ineach. He kept A at a temperature of 15C and B at a temperature of 35 C. Percentage of water

absorbed by raisins would be :(a) more in A then in B (b) more in B then in A(c) equal in both the beakers (d) twice in A then in B.

50 ml A B 5g A

15C B 35 C

(a) A B (b) B A

(c) A B (d) A B