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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

67025

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SECTION-A /

1. Define oxidising agents. Write the oxidising agent used for converting alcohol into carboxyclic acid.

2. Mention the function of retina in a human eye ?

3. During heavy rain in a village the rain water carried excessive fertilizers to a pond. How will itaffect the fish population in the pond in the long run ?

4. Name one natural and one man made ecosystem.

5. An element X placed in 2nd group and 3rd period of the modern periodic table, burns in air to form

a basic oxide.

Identify whether the element is a metal or non metal and write its atomic number and

configuration. Justify your answer.

X 2 3

6. There is an anomaly when it comes to the position of hydrogen in the modern periodic table.

State any two reasons.

7. Mention the purpose served by oral pills in reproductive health of females. Write its one

disadvantage.

8. Mention the role of urethra in human male reproductive system. What makes the transport ofsperms easier ?

9. Two lenses are of power 6.0 D and1.5 D. Find the focal length of each and also mention natureof each lens.

6.0 D 1.5 D

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10. State the function of the following parts of human eye :

(i) Iris (ii) Pupil

(i) (ii)

11. What is dispersion of light ? Name the

(i) component of white light that deviates the least and

(ii) the component that deviates the most while passing through a glass prism.

(i)

(ii)

12. List any two advantages of water harvesting over water stored in ponds.

13. Although coal and petroleum are produced by degradation of biomass, yet we need to conserve

them why ?

14. A compound X is the active ingredient of all alcoholic drinks. It is also a good solvent. When some

pieces of sodium are dropped in compound X, a gas is evolved as shown in the figure.

(i) Name the compound X.

(ii) Name the gas evolved in the process. How will you test the presence of this gas ?

(iii) Write the chemical equation involved in the above reaction.

X 'X'

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(i) X

(ii)

(iii)

15. How are elements arranged in the Modern Periodic Table ? State the position of

(i) Metals (ii) Nonmetals

(iii) Noble gases and (iv) Metalloidsin the Modern Periodic Table.

(i) (ii)

(iii) (iv)

16. Draw a neat diagram of germination of pollen on stigma. Label pollen tube, male gametes, femalegamete and ovary.

17. Study the following flow chart and answer the following questions.

(a) Name the type of trait that is responsible for changes shown in each generation. How is thistrait transmitted to next generation ?

(b) Name the phenomenon involved on evolutionary point of view.

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(a)

(b)

18. Humans for over more than two thousand years, cultivated wild cabbage as a food plant andgenerated different vegetable crop by artificial selection. Explain, based on which specificcharacters, crops like broccoli, kohlrabi and cabbage were selected in nature.

19. (a) What is meant by evolution ?(b) List two tools available to trace evolutionary relationships ?

(a)

(b)

20. We wish to obtain an erect image of an object, using either a concave mirror or a convex mirror bothof focal length 15 cm.(a) What should be the range of distance of the object from the mirror, in each case(b) Is the image larger or smaller than the object in each case(c) Draw a ray diagram to show the image formation in each case.

15 cm

(a)

(b) /

(c)

21. Define the following terms for a lens with the help of diagram.(a) Optical centre (b) Principal axis(c) Principal focus

(a) (b)

(c)

22. A doctor has prescribed a corrective lens of power 1.2 D to a person suffering from defect of

vision.

(a) Identify the defect from which he is suffering.

(b) Find the focal length of the lens.

(c) Is the prescribed lens diverging or converging ? Show the nature of his lens with the help of

a ray diagram.

1.2 D

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(a)

(b)

(c)

23. (i) What is meant by a Homologous series of carbon compound ? Write two suceessive

compounds of CH3OH, C2H5OH.

(ii) Draw the structures for the following carbon compounds :

(a) Propanone (b) Pentanal

(iii) Describe an activity with diagram to explain formation of ester.

(i) CH3OH, C2H5OH

(ii)

(a) (b)(iii)

OR/

(i) Differentiate between Esterification and Saponification ?

(ii) Explain the formation of micelles with the help of a diagram.

(iii) State the reason due to which a Bunsen burner sometimes gives yellow sooty flame ?

(i)

(ii)

(iii)

24. (a) Give reasons :(i) Wind acts as a pollinating agent.(ii) Variation is essential and beneficial to a species.(iii) Uses of condoms prevents pregnancy.

(b) Draw a neat and labeled diagram of human male reproductive system (at least 4 labels).

(a)

(i)

(ii)

(iii)

(b)

OR /

(a) What is Menstruation? Explain why it occurs.(b) Draw a neat and labeled diagram of human female reproductive system.(c) How does embryo get nutrition in mothers womb.

(a)

(b)

(c)

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25. (a) Differentiate between reflection and refraction.

(b) A ray of light is incident on the interface separating diamond and water. Given that

refractive index of diamond and water with respect to air are 2.42 and 1.33 respectively,

complete the diagram by showing refracted ray and mark angles of incidence and

refraction.

(c) Light enters from air to glass having refractive index 1.50. What is the speed of light in

glass? The speed of light in vacuums is 3108 ms1.

(a)

(b)

2.42 1.33

(c) 1.50

3108 ms1

OR/

(a) Refractive index of water is 4/3. What does it mean ?

(b) An object, 4.0 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0cm. 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.

(c) List two uses each of concave and convex mirror.

(a)4

3

(b) 4.0 cm 15.0 cm 25.0 cm

(c)

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(c) turns red litmus blue.(d) is a colourless and odourless gas.

(a)

(b)(c)

(d)

31. In order to determine the focal length of a concave mirror by focussing a distant object on a screen,one should measure the distance between(a) the object and the screen(b) the object and the mirror(c) the mirror and the screen(d) the mirror and the screen as well as that between the object and the screen

(a)

(b)

(c)

(d)

32. The teacher asks a student to fix the given screen at an appropriate place in the given experimentalset up, so that a clear image can be obtained on the screen. If the focal length of convex lens in 8 cm,the mark on the scale at which he should fix up the screen is ____________

(a) 12.8 cm (b) 13.0 cm (c) 8 cm (d) 13.8 cm

8 cm

(a) 12.8 cm (b) 13.0 cm (c) 8 cm (d) 13.8 cm

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33. In an experiment to determine the focal length of a convex lens, a student obtained a sharp invertedimage of a distant tree on the screen behind the lens. He then shifted the screen by 1cm away fromthe lens. He will now see on the screen(i) a blurred, erect, small image of the tree(ii) a blurred, inverted and enlarged image of tree(iii) a blurred, erect, enlarged image of the tree

(iv) a blurred, inverted, small image of the tree(a) (i) (b) (ii) (c) (iii) (d) (iv)

1cm

(i)

(ii)

(iii)

(iv)

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

34. In the experiment to trace the path of a ray of light through a rectangular glass slab, four students A,

B, C and D fixed the pins P1, P2, P3 and P4 as follows :

The correct positions of pins is that of student :(a) A (b) B (c) C (d) D

A, B, C , D P1, P2, P3 P4

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

35. A student performs the experiment on tracing the path of a ray of light passing through a

rectangular glass slab for different angles of incidence. He measures the angle of incidence i,

angle of refraction

r and angle of emergence

e far all his observations. He would find that in allcases :

(a) i > r ; i r ; i =e

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(c) i < r ; i =e (d) i < r ; i >e

i, r e

(a) i > r ; i r ; i =e

(c) i < r ; i =e (d) i < r ; i >e

36. The process represented in the diagram below is :-

(a) Spore formation in amoeba (b) bud formation in amoeba

(c) Gamete formation in amoeba (d) daughter cell formation in amoeba

(a) (b)

(c) (d)

37. A student drew the following diagram upon observing a permanent slide of binary fission inamoeba. Point out the mistake in the diagram :-

(a) Size of daughter cell to be formed is not appropriate(b) Constriction has appeared before nuclear division(c) Constriction is not fully deep on either side(d) Size of the parent cell to undergo fission is not appropriate.

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(a)

(b)

(c)

(d)

38. After observing different slides of budding in yeast it may be concluded that the shape of yeast cellsis :(a) oval (b) spherical (c) octagonal (d) both (a) and (b)

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

39. Study the structure shown below.

This structure shows(a) Yeast undergoing binary fission (b) Amoeba undergoing budding(c) Yeast undergoing budding (d) Amoeba undergoing binary fission

(a) (b)

(c) (d)

40. 5 g of raisins were kept immersed in water for 2 hours and then weighed. The weight of swollenraisins was found to be 7.5 g. The percentage of water absorbed by raisins is (a) 50% (b) 75% (c) 25% (d) 20%

5 g 2 7.5 g

(a) 50% (b) 75% (c) 25% (d) 20%

41. To find the percentage of water absorbed by raisins before weighing the soaked raisins their outersurface should be dried by (i) rubbing them with cotton.(ii) gently keeping them on a blotting paper.(iii) heating them on a pan.(iv) placing them in front of a heat radiator.The correct method of drying is (a) (i) (b) (ii) (c) (iii) (d) (iv)

(i)

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(ii)

(iii)

(iv)

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