7/31/2019 67042 SC QP

1/14

Page 1 of14

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 exceptmentioned 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 thisregard.

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 otherelectronic 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.

7/31/2019 67042 SC QP

2/14

Page 2 of14

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

67042

7/31/2019 67042 SC QP

3/14

7/31/2019 67042 SC QP

4/14

Page 4 of14

(a) (b)

9. You are provided with two lenses of focal length 10 cm and 20 cm. Which of the two lenses

would you suggest to obtain greater convergence of refracted light ? Justify your choice.

10 cm 20 cm

10. An old person is unable to see clearly nearby object as well as distant objects

(i) What defect of vision is he suffering from?

(ii) What kind of lens will be required to see clearly the nearby as well as distant objects?

Give reasons?

(i)

(ii)

11. What is dispersion of light ? Name the

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

(ii) component of white light that deviates the most, while passing through a glass prism.

(i)

(i)

12. List any four human activities responsible for the pollution of river water.

13. List any four ways of conserving fossil fuels.

14. (i) What is Vinegar ? State its one use.(ii) Which gas is produced when dilute ethanoic acid is added to sodium bicarbonate ?

How will you test the presence of this gas ?

(i)

(ii)

7/31/2019 67042 SC QP

5/14

Page 5 of14

15. Group 1 Group 16

X A

Y B

Z -M D

Giving reasons, explain the following :(a) Element M has largest atomic size as compared to the other elements, X, Y, Z shown in

Group 1 of the section of periodic table shown above.(b) Element A has valency of 2.(c) Elements A, B and D are non metals.

Group 1 Group 16

X A

Y B

Z -

M D

(a) M X, Y, Z

(b) A 2

(c) A, B, D

16. Draw a diagram showing the fertilization of pollen grain on the stigma and label on it thefollowing (i) Pollen tube (ii) Ovary.

(i) (ii)

17. Trace the F1 generation formed by crossing two plants with separate traits for shape and seedcolour- round green (RRyy) and wrinkled yellow(rrYY). Mention the characteristic exhibited byit .

(RRyy) (rrYY) F1

18. How is the sex of a new born determined genetically in humans?

19. (a) Name two factors that could lead to the rise of new species.(b) Why are the wings of birds and bats considered analogous organs?

(a)

(b)

20. How is the refractive index of a medium related to the speed of light ?

Light enters from air to diamond having refractive index 2.40. Calculate the speed of light in

the diamond. The speed of light in air is 3

108

ms1

.

7/31/2019 67042 SC QP

6/14

Page 6 of14

2.40 3108ms1

21. List two reasons of using convex mirrors as rear view mirror in vehicles.

An object is placed at a distance of 10 cm in front of a convex mirror of focal length

15 cm. Find (i) Position and (ii) nature of the image formed.

15 cm 10 cm

(i) (ii)

22. A beam of white light falling on a glass prism gets split up into seven colours marked 1 to 7 as

shown in the diagram

(a) The colour at position marked 3 and 5 are similar to the colour of the sky and the

colour of gold metal respectively. Is the above statement made by the student correct or

incorrect ? Justify.

(b) Which of the above shown positions corresponds approximately to the colour of

(i) a brinjal (iii) Neel which is applied to clothes

(ii) danger signal (iv) Orange

1 7

(a) 3 5

(b)

7/31/2019 67042 SC QP

7/14

Page 7 of14

(i) (ii)

(iii) (iv)

23. (i) What is observed, when a small piece of sodium, about the size of a couple of grains of

rice, is dropped into a test tube containing ethanol ? How is the gas evolved tested ?(ii) Detergentsare more effective than soaps in hard water. Justify this statement.

(i)

(ii)

OR/

(i) State in brief two main reasons behind the existence of a large number of carboncompounds in nature.

(ii) What is a homologous series of carbon compounds ? Mention its any two properties.(iii) Write the name of following compounds :

(a) (b)

(i)

(ii)

(iii)

(a) (b)

24. (a) Write the function of (i) ovary (ii) uterus in the human female reproductory system.(b) How does embryo get nourishment inside mothers body ?(c) What happens when the egg is not fertilized ?

(a) (i) (ii)

(b)

(c)OR/

(a) Draw a neat diagram of human female reproductive system and label on it thefollowing four parts.(i) Ovary (ii) Fallopian tube(iii) Uterus (iv) Cervix

(b) What are sexually transmitted diseases ? Name a sexually transmitted disease causeddue to(i) bacterial infection (ii) viral infection.

(a)

(i) (ii)

7/31/2019 67042 SC QP

8/14

Page 8 of14

(iii) (iv)

(b) (i) (ii)

25. Draw ray diagrams in the following cases to show the position and nature of the image formed

by a concave mirror when an object is placed.(i) between pole and focus

(ii) between focus and centre of curvature

(iii) at the centre of curvature

How will the nature and position of image formed change in case (i) and (ii) if the concave

mirror is replaced by a convex mirror ?

(i)

(ii)

(iii)

(i) (ii),

OR/

Name the type of lens used to obtain.

(i) a magnified and virtual image of an object.

(ii) a diminished and virtual image of an object.

Draw labelled ray diagrams to show the formation of the required image in each of the above

two cases. Which of these lenses could also form a magnified and real image of the object ?

State the position of the object for which this could happen.

(i)

(ii)

SECTION - B /

26. Time taken for the colour of ferrous sulphate solution to turn colourless when Aluminium

metal is added to it is approximately.

(a) Few seconds (b) 2 hours

(c) 24 hours (d) 30 minutes

7/31/2019 67042 SC QP

9/14

Page 9 of14

(a) (b) 2

(c) 24 (d) 30

27. A student added Aluminium, copper, Zinc and iron metals to copper sulphate solution in 4

different test tubes. In one of the test tubes he observed that no colour change of coppersulphate solution took place. Mark that test tube ?

(i) Test tube 1 Aluminium + copper sulphate

(ii) Test tube 2 Zinc + copper sulphate

(iii) Test tube 3 Copper + copper sulphate

(iv) Test tube 4 Iron + copper sulphate

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

(i) 1 +

(ii) 2 +

(iii) 3 +

(iv) 4 +

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

28. A brisk effervescence was observed by a student when he added acetic acid in the test tubes-

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

7/31/2019 67042 SC QP

10/14

Page 10 of14

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

29. For recording the odour of acetic acid(A) It should be taken in a test tube and heated(B) It should be rubbed in fingers and then smelled

(C) The test tube containing Ethanoic acid should be taken as close as possible to the nostrilsand then smelled.(D) The vapour of Ethanoic acid should be waved with one hand slowly towards the nostrils

and then smelled.(a) A (b) B (c) C (d) D

(A)

(B)

(C)

(D)

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

30. Odour of acetic acid is like :

(a) scent (b) vinegar (c) apple (d) orange

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

31. The focal length of the concave mirror in the experimental set up shown below is :

(a) 10.3 cm (b) 11.0 cm (c) 11.4 cm (d) 12.2 cm

7/31/2019 67042 SC QP

11/14

Page 11 of14

(a) 10.3 cm (b) 11.0 cm (c) 11.4 cm (d) 12.2 cm

32. A student obtained a blurred image of a distant object on a screen using a concave mirror. Inorder to obtain a distinct image on the screen he should shift the mirror :(a) towards the screen

(b) away from the screen(c) to a position very far away from the screen(d) either towards or away from the screen depending upon the position of the object.

(a)

(b)

(c)

(d)

33. To determine the focal length of a convex lens, four students A, B, C and D obtained the imageof a distant building on a screen. They measured the distances as given below between :(A) screen and the building(B) lens and the building(C) lens and the screen(D) building and its imageThe correct value of focal length will be determined 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

34. While performing the experiment on tracing the path of a ray of light passing through a glassslab as shown in the given diagram, four students interpreted the results as given below. Whichone of the four interpretations is correct ?

7/31/2019 67042 SC QP

12/14

Page 12 of14

(a) r > e (b) re (c) ir (d) i > r

(a) r > e (b) re (c) ir (d) i > r

35. On the basis of their experiment to trace the path of a ray of light passing though glass slab,four students arrived at the following conclusions. Select the correct conclusion.(a) Angle of incidence is greater than the angle of emergence(b) Angle of emergence is less than the angle of refraction(c) Emergent ray is parallel to the incident ray.(d) Emergent ray is parallel to the refracted ray.

(a) (b)

(c) (d) 36. A student is given a permanent slide showing binary fission in Amoeba. The following are the

steps in focusing the object under microscope.(i) Place the slide on the stage; look through the eye-piece and adjust the mirror and

diaphragm to get even illumination(ii) Look through the eyepiece and raise the objective using coarse adjustment until the

object is focused.(iii) Make the focus sharp with the help of fine adjustment.(iv) Look through the eyepiece and move the slide until the object is visible.

The appropriate sequence of steps is :(a) (i), (ii), (iii), (iv) (b) (ii), (iii), (i), (iv)(c) (iv), (ii), (i), (iii) (d) (i), (iv), (ii), (iii)

(i)

7/31/2019 67042 SC QP

13/14

Page 13 of14

(ii)

(iii)

(iv)

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

37. Binary fission begins in Amoeba with(a) Constriction of the body (b) Elongation of the body(c) Constriction of the nucleus (d) Elongation of the nucleus.

(a) (b)

(c) (d)

38. A chain of yeast cells is formed when :(a) yeast cells do not separate after budding.(b) yeast cells are infected by a virus.(c) yeast cells stick to each other due to mucus(d) yeast cells are infected by a bacteria.

(a)

(b)

(c)

(d)

39. Given below are diagrams drawn by four students for budding of yeast.

The students who has drawn correct diagram-

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

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

40. One of the important precautions for the experiment of determining the percentage of water

7/31/2019 67042 SC QP

14/14

Page 14 of14

absorbed by raisins is : wipe the soaked raisins gently using a dry filter paper beforemeasuring the final mass. This precaution is essential as it ensures that :(a) hands do not get wet.(b) the scale pan does not get wet.(c) only the water absorbed by the raisins is weighed.(d) the raisins lose water before weighing.

(a)

(b)

(c)

(d)

41. 3.5g of raising were placed in 30 mL of distilled water for about 3 hours. The mass of the

soaked raisins was found to be 4.2g. The percentage of water absorbed by raisins is(a) 16.6% (b) 20 % (c) 33.3% (d) 40%

3.5g 30 mL 3

4.2g

(a) 16.6% (b) 20 % (c) 33.3% (d) 40%

- o O o -