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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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9. (a) The diagram given below shows a light ray from an object incident on the sphericalmirror. Complete this ray diagram to show the position of image.

(b) Mention one use of this mirror.

(a)

(b)

10. The sky appears black instead of blue to an astronaut. State the reason why ?

11. Name the defect of vision in a person whose :

(a) near point is more than 25 cm away.

(b) far point is less than infinity.

State the nature of corrective lens used in each case.

(a) 25 cm

(b)

12. (a) Why are coal and petroleum called fossil fuels ?(b) Name the two elements which are present both in CNG and petroleum.

(a)

(b) CNG

13. Why should we conserve forests ? Suggest two ways to conserve forests.

14. Answer the following :(a) Give a chemical test to distinguish between butter and cooking oil.

(b) Write the electron dot structure of C2H4.

(c) Write the name of the following compounds.(i) CH3-CHO (ii) CH3-CH2-Br

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(a)

(b) C2H4

(c)

(i) CH3-CHO (ii) CH3-CH2-Br

15. (a) State and explain the modern periodic table.(b) How does non metallic character varies as we move down in a group.

(a)

(b)

16. Briefly explain the following :

(a) Fertilization.

(b) Ovulation.

(c) Role of placenta.

(a)

(b) (Ovulation)

(c)

17. Define the following with one example for each :

(a) Genetic drift(b) Natural selection

(c) Reproductive isolation

(a)

(b)

(c)

18. Name the descendants of wild cabbage. How were they developed ?

19. Mendel studied the inheritance pattern of traits in a pea plant. According to thisstudy, he obtained 9 : 3 : 3 : 1 ratio for certain traits in progeny of F-2 generations.Based on it answer these questions :

(i) Which trait did he study ? How do they represent themselves ?

(ii) What was the trait of progeny of F-1 ?

(iii) Which rule does this inheritance pattern suggest ?

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F2 9 : 3 : 3 : 1

(i)

(ii) F1

(iii)

20. (a) Define absolute refractive index. Given the refractive index of air, glass, kerosene,diamond as 1, 1.5, 1.44 and 2.42 respectively, arrange the following media in the orderof increasing optically denser nature.

(b) Arrange the above medii in increasing order of speed of light in each of them.

(a)

1, 1.5, 1.44, 2.42

(b)

21. (i) What are the angle of incidence and angle of refraction for the normal incidence, of a rayof light on a glass slab ? Draw a ray diagram for such an incident ray and label incident,refracted and emergent ray on it.

(ii) The refractive index of water is 4/3 and the speed of light in air is 3108 m/s. Calculatethe speed of light in water.

(i)

(ii) 4/3 3108 m/s

22. A person cannot see objects farther than 2 m from the eye clearly. Name the defect of vision heis suffering from. List the cause of this defect. Draw ray diagram to show how with the help ofa proper lens this defect can be corrected.

2 m

23. (a) What is homologous series ? List its any two characteristics.(b) What happens when ethanol is heated with excess concentrated sulphuric acid at 443K ?(c) What role does concentrated sulphuric acid play in this reaction ?(d) Write the chemical equation involved.(e) Which of the following hydrocarbons undergo addition reactions :

C2H6, C3H8, C3H6, C2H2, CH4.

(a)

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(b) 443K H2SO4

(c) H2SO4

(d)

(e)

C2H6, C3H8, C3H6, C2H2, CH4.

OR/ (a) Why are covalent compounds generally poor conductors of electricity ?

(b) Draw the structure of propanal, C2H5CHO.(c) An organic compound A is widely used as a preservative in pickles reacts with ethanol

in presence of concentrated sulphuric acid to form a sweet smelling compound B.(i) Identify the compounds A and B.(ii) Write the chemical equation for the reaction of A with ethanol to form B.(iii) How can we get compound A from B ? Name the process involved.

(a)

(b) C2H5CHO

(c) A H2SO4

B

(i) A B

(ii) A B

(iii) B A

24. (a) Draw a well labelled diagram of human female reproductive system.

(b) Name the site of fertilization.

(c) What will happen if egg is not fertilized ?

(a)

(b)

(c)

OR /

(a) Draw a well labelled diagram of human male reproductive system.

(b) When does ovulation occur during the menstrual cycle in a normalhealthy woman ?

(c) What is menopause ?

(a)

(b)

(c) (menopause)

25. (i) Draw ray diagrams to represent nature, position and size of the image formed by aconvex lens for the object placed :(a) at 2F1(b) between F1 and the optical centre O of lens.

(ii) An object 3.0 cm high is placed perpendicular to the principal axis of a concave lens of

focal length 15.0 cm. The image is formed at a distance of 10.0 cm from the lens.Calculate(a) distance at which the object is placed and

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(b) size and nature of the image formed.

(i)

(a) 2F1

(b) F1 O

(ii) 3.0 cm 15.0 cm10.0 cm

(a)

(b)

OR/

(i) Draw ray diagrams showing the image formation by a convex mirror when an object isplaced(a) at infinity(b) At some distance in front of the mirror.

(ii) An object 3.0 cm high is placed at a distance of 27 cm from the pole of a concave mirrorwhich produced a 6 cm high real image.(a) What is the focal length of the mirror ?(b) Find the position of the image.

(i)

(a) (b)

(ii) 3.0 cm 27 cm 6 cm

(a) (b)

SECTION - B /

26. Some crystals of copper sulphate were dissolved in water. The colour of the solution obtainedwas :

(a) pale green (b) Light blue

(c) dark green (d) brown

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

27. A student puts one big iron nail each in four test tubes containing solutions of CuSO4, FeSO4,

ZnSO4 and Al2(SO4)3. A reddish brown coating was observed after some time only on thesurface of iron nail which was put in the solution of :

(a) Al2(SO4)3 (b) ZnSO4 (c) FeSO4 (d) CuSO4

CuSO4, FeSO4, ZnSO4 Al2(SO4)3

:

(a) Al2(SO4)3 (b) ZnSO4

(c) FeSO4 (d) CuSO4

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28. 5 mL of acetic acid was added to 5 mL of water in a test tube. The resulting mixture is correctlyrepresented in the diagram :

(a) 1 (b) 2 (c) 3 (d) 4

5 mL 5 mL

(a) 1 (b) 2 (c) 3 (d) 4

29. When the stopper of a bottle containing colourless liquid was removed, the bottle gave out asmell like that of vinegar. The correct identification of the liquid made by a student is :(a) Acetic Acid (b) Hydrochloric Acid(c) Sodium Hydroxide (d) Nitric Acid

(a) (b)

(c) (d)

30. 5 mL acetic acid was taken in two test tubes marked 1 and 2. Blue litmus was dipped into 1 and

red litmus was dipped into 2. Correct observation reported by the student :(a) no change in 1 and red litmus changed to blue in 2.(b) blue litmus changed to red in 1 and no change in 2.(c) no change in colour of both litmus.(d) blue litmus changed to red in 1 and red change to blue in 2.

1 2, 5 mL 1

2

(a) 1 2

(b) 1 2

(c)

(d) 1 2

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31. A student determines the focal length of device X, by focusing the image of a far off object onthe 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. A student obtained a sharp image of the grill of a window on a screen, using a convex lens. Forgetting better results, the teacher suggested focusing of a distant tree instead of the grill. Inwhich direction should the lens be moved for this purpose ?(a) Away from the screen (b) Very far away from the screen(c) Behind the screen (d) Towards the screen

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(a) (b)

(c) (d)

33. Four students A, B, C and D obtained a highly diminished, real and inverted image of a distanttree on a screen and carried out measurement of focal length of the given concave mirror asshown in the following diagrams.

Students likely to get correct value of focal length are :

(a) A and B (b) B and C (c) C and D (d) D and AA, B, C D

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

34. In the experiment to trace the path of a ray of light through a rectangular glass slab using pinsP1, P2, P3, P4 four students did the following :

(A) Kept the eyes far from the glass slab while placing both the pins P3 and P4 .

(B) Kept the eyes close to the glass slab while placing both the pins P3 and P4.

(C) Kept the eyes far from the glass slab while placing pin P3 and close to the glass slab

while placing pin P4.(D) Kept the eyes close to the glass slab while placing pin P3 and far from the glass slab

while placing pin P4.

The correct procedure is that of student :

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

P1, P2, P3, P4

A, B, C, D

(A) P3 P4

(B) P3 P4

(C) P3 P4

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(D) 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 for all his observations. He would find thatin all cases :

(a) i is more than r but equal to e

(b) i is less than r but equal to e

(c) i is more than e but equal to r

(d) i is less than e but equal to r

(a) i, r e

(b) i, r e

(c) i, e r

(d) i, e r

36. The given slides A and B were identified by four students I, II, III and IV as stated below.

Student Slide A Slide B

I Binary fission is Amoeba Daughter cells of Amoeba

II Budding in Yeast Buds of yeast

III Binary fission in Amoeba Buds of yeast

IV Budding in yeast Daughter cells in Amoeba

Of the above mentioned identifications of slides A and B, which one is correct ?(a) I (b) II (c) III (d) IV

I, II, III IV A B

A B

I

II

III

IV

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

37. Study the figure shown below. Select the one which resembles the slide in which binary fissionin amoeba is illustrated :

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

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

39. To prepare a culture of yeast cells, yeast powder is added to :(a) Soap solution (b) 10% sugar solution(c) Hydrochloric acid (d) Salt solution

(a) (b) 10%(c) (d)

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40. To determine the percentage of water absorbed by raisins, raisins with stalk are neededbecause :(a) stalked raisins can be easily picked up through forceps to get final weight.(b) stalk with vascular tissue provides necessary nutrients to raisins.(c) through stalk excess water can be removed from raisins exterior.

(d) In stalkless raisins cell wall and cell membrane may be damaged.

(a)

(b)

(c)

(d)

41. The initial mass of raisins is 6g and final mass after soaking in water in 8g. Then, the percentageof water absorbed by raisins is :(a) approx 24% (b) approx 40%(c) approx 50% (d) approx 33%

6g 8g

(a) 24% (b) 40% (c) 50% (d) 33%

- o O o -