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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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11. Trace the path of a ray of light through a triangular glass prism. Also label the diagram.

12. Fossil fuels are being increasingly used as source of energy. List any two reasons for replacingthese by alternate sources of energy.

13. List any two reasons due to which construction of large dams is opposed.

14. With the help of a diagram explain cleansing action of soap.

15. Group 13 Group 17

-- B

-- C

-- --

A D

Using the given part of the periodic table, answer the following questions

(a) Compare the electro negativities of A and D.

(b) What is the valency of element D ?

(c) Out of the element given above name the most non metallic element in group 17.

13 17

-- B

-- C

-- --

A D

(a) A D

(b) D

(c) 17

16. (a) Name an organism that reproduces by Regeneration.(b) How does the developing embryo get nourishment in the mothers body ?

(a)

(b)

17. In a cross between plants with purple flowers & plants with white flowers the offsprings of F1generation all had purple flowers. When the F1 generation was self-crossed, it was observed in

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(cm) / (cm)

(i) 60 20

(ii) 40 24

(iii) 30 30

(iv) 24 40

(v) 15 70

(a)

(b)

(c)

21. A glass slab made of a material of refractive index n1 is kept in a medium of refractive index n2.

A light ray is incident on the slab. Complete the path of rays of light emerging from the glass

slab, if :

(a) n1>n2 (b) n1n2 (c) n1 n2 (b) n1n2 (c) n1 < n2

22. Why do we observe difference in colours of the Sun during sunrise, sunset and noon ? Supportyour answer with a labelled diagram.

23. (a) Complete the following equations :

(i) CH4 + O2 (excess air)

(ii) CH3COOH + C2H5OHAcid

(iii) CH3 CH2OH 2 4Conc. H SO

443 K

(b) Write the name of the next homologue of CH3OH and HCOOH.

(c) How does boiling point and melting point of hydrocarbons change with increase inmolecular mass ?

(a)

(i) CH4 + O2

(ii) CH3COOH + C2H5OH

(iii) CH3 CH2OH 2 4H SO

443 K

(b) CH3OH HCOOH

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(c)

OR/

(a) Define homologous series of organic compounds. Mention any two characteristics of

homologous series.

(b) Describe a chemical test to distinguish between ethanol and ethanoic acid.

(c) Identify functional group in Pentanone.

(a)

(b)

(c)

24. (a) Explain what is Menstruation. List two methods of contraception and explain how they

work.

(b) Draw a germinated seed and label the future root, future shoot and structure that storesfood.

(a)

(b)

OR/

(a) Give reasons :-

(i) Wind acts as a pollinating agent.

(ii) Variation is essential and beneficial to a species.(iii) Use of condoms prevents pregnancy.

(b) Draw a neat diagram of human male reproductive system and label its four important

parts.

(a)

(i)

(ii)

(iii)

(b)

25. (a) State Snells law of refraction. Express refractive index of a medium as a mathematicalformula.

(b) An object 4 cm. in size, is placed at 25 cm. in front of concave mirror of focal length 15

cm. At what distance from the mirror should a screen be placed in order to obtain a

sharp image ? Find the nature and the size of the image.

(a)

(b) 4 cm 15 cm 25 cm

OR/

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(a) What are laws of refraction of light ?

(b) A convex mirror used for rear view on an automobile has a radius of curvature

3.00 m. If a bus is located at 5 m from the mirror. Find position, nature and relative size

of the image.

(a)

(b) 3.00 m5 m

SECTION - B /

26. A student took CuSO4 solution in four test tubes A, B, C and D. She placed small piece of Cu in

test tube A, Fe in test tube B, Zn in test tube C and Al in test tube D. After about an hour she

noticed that no deposition was formed on the piece of :

(a) zinc (b) iron (c) copper (d) aluminium

A, B, C D CuSO4 A Cu, B Fe

C Zn D Al

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

27. A student took aqueous zinc sulphate, copper sulphate, iron sulphate and aluminium sulphate

solutions in four test tubes. She dipped an iron strip in each test tube. After sometime she

would observe the deposition of metal on iron in the test tube (s) :

(a) P and Q (b) Q only (c) R only (d) R and S

(a) P Q (b) Q (c) R (d) R S

28. A student was given three samples containing ethanoic acid, sodium carbonate solution and

water in test tubes I, II and III. On dipping pH paper in the three test tube he observed thatthe colour of pH paper turned in the test tube as shown in the diagram.

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The correct identification of solutions in test tubes, I, II and III is :(a) Na

2CO

3, H

2O, CH

3COOH respectively

(b) H2O, CH

3COOH, Na

2CO

3respectively

(c) CH3COOH, H

2O, Na

2CO

3respectively

(d) Na2CO

3, CH

3COOH, H

2O,

respectively

I, II III

pH pH

I, II III

(a) Na2CO

3, H

2O, CH

3COOH (b) H

2O, CH

3COOH, Na

2CO

3

(c) CH3COOH, H

2O, Na

2CO

3(d) Na

2CO

3, CH

3COOH, H

2O,

29. Which one of the following would be observed when 10 mL of acetic acid are added to10 mL of water and the mixture is kept for sometime after shaking it well ?

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

10 mL 10 mL

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

30. Four students performed experiments of acetic acid with :(I) Sodium carbonate, and(II) Sodium hydroxide, and(III) Sodium bicarbonate, and(IV) Sodium chlorideseparately. Each one brought a burning candle near the mouth of the test tube. The candlewould not be extinguished near the mouth of the test tubes :

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

(I) (II)

(III) (IV)

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

31. A student determines the focal length of device X, by focussing the image of a far off object on

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the screen positioned as shown in the figure below :

The device X is a :(a) convex lens (b) concave lens(c) convex mirror (d) concave mirror

X,

X

(a) (b)

(c) (d)

32. To determine the focal length of a concave mirror, four students A, B, C and D obtained theimage of the window grill on a wall. They measured the distances as given below between.A Window grill and the wallB Window grill and the mirrorC Mirror and wallD Window grill and the wall and also between the mirror and the wall.Correct focal length will be obtained by(a) A (b) B (c) C (d) D

A, B, C D

A

B

C

D

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

33. Which of the following set of materials represents the minimum material required for

determining the focal length of a convex lens by obtaining the image of a distant object on ascreen in your school laboratory.

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(i) Set A A candle, a match box, a convex lens, a lens holder, a screen with stand.(ii) Set B A lens holder, a convex lens, a concave lens, a measuring scale.(iii) Set C A convex lens, a lens holder, a screen with a stand, a measuring scale.(iv) Set D A convex lens, a burning candle, a screen with a stand, a lens holder.(a) Set A (b) Set B (c) Set C (d) Set D

(i) A

(ii) B

(iii) C

(iv) D

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

34. In which of the following will a student would observe that the ray of light passes through the

slab undeviated ?

?

35. In which of the following diagrams the correct representation of angle of incidence (i) angle ofrefraction (r) and angle of emergence(e) is shown :

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

(i) , (r) (e

) ?

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

36. While observing a student will find that the shape of amoeba is

(a) round (b) oval (c) irregular (d) rod like

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

37. In which of the following is binary fission observed ?

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

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

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

respectively 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

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(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

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

40. At the end of the experiment, to determine the percentage of water absorbed byraisins, the raisins are gently wiped just before weighing. This is to ensure that :(a) hands do not get wet.(b) the raisins lose water before weighing.(c) only water absorbed by raisins is weighed.(d) the weighing scale does not get wet.

moJ{H$e{em| mamAdemo{fV Ob H$s {VeVVm {ZYm[aV H$aZmHo$ A{V MaUm| | ^rJr {H$e{em| H$mo VmobZo go R>rH$nhbo$ Yrao go nm|N>Vo h& Eogm h gw{ZpMV Ho$ {bE {H$m OmVm h {H$ :(a) hmW Jrbo Zht hm|(b) VmobZo go nyd {H$e{e Ob Imo X|(c) Ho$db {H$e{em|mam Ademo{fV Ob hr Vwbo(d) Vwbm H$m nbS>m Jrbm Z hmo &

41. While performing an experiment to determine the percentage of water absorbedby raisins, the following data was obtained :Mass of water taken in the beaker= 15.g

Mass of raisins before soaking them in water = 200mgMass of raisins after soaking in water for 2 hours = 250 mgMass of water left in the beaker =12g

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The percentage of water absorbed by raisins would be :(a) 20% (b) 25% (c) 40% (d) 50%

15.g

200mg

250mg

12g

(a) 20% (b) 25% (c) 40% (d) 50%

- o 0 o -