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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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SUMMATIVE ASSESSMENT II, 2012

II, 2012

SCIENCE /

Class X / X

Time allowed : 3 hours Maximum Marks : 80

3 80

General 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

67026

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SECTION-A /

1. State the role of concentrated H2SO

4, in obtaining ethene from ethanol.

H2SO

4

2. Imagine for a moment that the earth has no atmosphere. What would be the colour of sky in such asituation ? Write in one sentence the reason for your answer.

3. Name the two components of ecosystem. 1

4. Name the radiations absorbed by ozone layer in the atmosphere. 1

5. (a) State modern periodic law.(b) Mention the position of the following in the periodic table :

(i) Isotopes of an element(ii) Hydrogen

(a)

(b)

(i)

(ii)

6. The atomic number of three elements A,B and C are 11, 14 and 17 respectively.(a) State the group to which these elements belong in the modern periodic table.(b) Write the formula of the compound formed when the element B reacts with C.

A, B C 11, 14 17

(a)

(b) B C

7. Explain the spore formation in Rhizopus. Mention one advantage to the organism when itreproduces through spores.

2

8. (a) Define germination.

(b) Mention the role of radicle and cotyledons in the process of germination.

(a)

(b)

2

9. (i) Explain why a pencil placed obliquely in a beaker half-filled with water appears to be bent at

the surface when seen from side.(ii) Given below are the refractive indices of a few media. Identify the media in which the speed

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of light will be highest and lowest respectively -

Medium Refractive Index

Diamond 2.42

Glass 1.5

Water 1.3

Kerocene oil 1.4

(i)

(ii)

2.42

1.5

1.3

1.4

10. Newton placed two triangular prisms in inverted position with respect to each other. He then let

white light pass through them. What was his observation on screen ? State reason for suchobservation and draw a diagram of this experiment.

11. The power of a lens is +1.5 dioptre. Name the type of defect of vision that can be corrected byusing this lens ? Draw a ray diagram to illustrate this defect of vision.

+1.5

12. List any two measures you would take to conserve electricity at your house so that consumption offossil fuel is reduced.

13. Narmada Bachao Aandolan raised issues of how dams create environmental problems. Discussthe two such issues.

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14. (a) Write the formula of the following functional group :(i) aldehyde (ii) ketone

(b) Using the general formula for alkenes, draw the electron dot structures of first twocompounds.

(a)

(i) (ii)

(b)

15. Two elements X and Y belong to groups 1 and 3 respectively in the same period, compare these withrespect to their :(a) metallic character(b) size of the atoms(c) formulae of their oxides and chlorides.

X Y 1 3

(a)

(b)

(c)

16. Draw a neat diagram of longitudinal section of a flower and label stigma, petal, anther and sepal. 3

17. The sex of the human being is determined at the time of fertilization. Show it with the help of adiagram.

3

18. (a) List the factors that could lead to the rise of a new species.(b) Explain with the help of an example how together these factors give rise to new species.

(a)

(b)

3

19. (a) What is meant by homologous organ ?(b) Give any two examples of it.(c) In what way do homologous organ provide evidence in favour of evolution ?

(a)

(b)

(c)

3

20. (i) State Laws of refraction of light.

(ii) The speed of light in a transparent medium is 0.7 times that of its speed in vacuum.

Calculate the absolute refractive index of the medium.

(i)

(ii) 0.7

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21. A convex mirror used for rear-view of an automobile has a radius of curvature of 3.00 m. If a bus is

located at 5m from this mirror, find the position and nature of the image.

3.00 m 5m

22. What is meant by least distance of distinct vision ? Mention its value . Explain how is the focallength of eye lens is changed by the ciliary muscles when object distance from itchanges ?

23. (i) What is an oxidising agent ? Give one example. With the help of chemical equation, explainthe role of oxidising agent in oxidation of alcohols.

(ii) What type of reaction takes place when chlorine is added to hydrocarbons in the presence ofsunlight ?

(iii) What are catalysts ? Give one example.

(i)

(ii)

(iii)

OR(i) A compound 'X' is used as a preservative in pickles. It often freezes during winter in cold

countries. Name the compound 'X'. Which functional group is present in the compound'X' ?

(ii) With the help of chemical equation, explain the reaction of 'X' with ethanol. Mention one useof the product formed in the reaction.

(iii) State the reaction of 'X' with sodium carbonate.

(i) 'X' 'X'

'X'

(ii) 'X'

(iii) 'X'

24. Write the function of the following with respect to the point givenbelow :-(a) Urethra in male reproductive system.(b) Long tail of sperms.(c) Inner linings of uterus is richly supplied with blood.(d) Pollen tube develops from the pollengrain which lands on stigma.(e) Testes are located outside abdominal cavity in scrotum

-

(a)

(b)

5

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(c)

(d)

(e)

OR(a) Mention any three advantages of sexual reproduction over asexual reproduction ?(b) Define the different types of pollination and give one example of each.

(a)

(b)

25. (i) A 4.5 cm long needle is placed 12 cm away from a concave lens of focal length 15 cm. Findthe location of the image and its magnification.

(ii) Identify the nature of spherical mirror or of lens in following cases, and draw ray diagramsfor each case.

(a) When object is placed between mirror and its focus, image formed is erect,

enlarged and behind it.(b) when object is placed at 2F of the lens image formed is diminished, erect and onthe same side of the lens as that of the object.

(i) 15 cm 12 cm 4.5 cm

(ii)

(a)

(b) 2F

OR/

(i) With reference to a concave mirror draw ray diagrams to illustrate the characteristic of focusand center of curvature.

(ii) An object of height 10 cm is kept in front of a convex mirror at a distance of 10 cm from itsoptical centre. Find the position, nature and size of the image if the lens has a focal length of2 cm.

(i)

(ii) 10 cm 10 cm 2

cm

SECTION - B /

26. A student poured copper sulphate solution in a test tube containing a cleaned iron nail. After some

time he would observe that the copper would start depositing.

(a) at the head of the nail (b) at the tip of the nail(c) in the middle of the nail (d) anywhere on the nail

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(a) (b)

(c) (d)

27. Colour of ZnSO4 solution is

(i) Light Green (ii) Colourless

(iii) Blue (iv) Deep Green

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

ZnSO4

(i) (ii)

(iii) (iv)

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

28. Four students A, B, C and D observed the chemical properties of acetic acid and recorded theirobservations in the table given below. The correct observations were made by :

StudentsEffect on litmus Reaction with NaHCO3

Blue to red Red to blue CO2 gas H2 gas

A X X

B X X

C X X

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

A, B, C D

NaHCO3

CO2

H2

A X X

B X X C X X

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

1

29. A student mixed 5 mL of acetic acid in 5 mL of water in a test tube. After shaking the mixture hewould observe that the resulting mixture is :(a) clear (b) turbid(c) showing precipitate (d) having two distinct layers of water and acid

5 mL 5 mL

(a) (b)

(c) (d)

1

30. A student took 2 mL acetic acid in a test tube. He added a pinch of X in it and found that a gas Yis produced with effervescence. He also observed that the gas Y turns lime water milky. Hiscorrect conclusion on the basis of these observations may be X and Y are respectively.

1

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(a) sugar and CO2 gas.

(b) common salt and H2 gas

(c) sodium hydrogen carbonate and CO2 gas

(d) sodium hydrogen carbonate and hydrogen chloride gas

2 mL XY Y

X y

(a) CO2

(b) H2

(c) CO2

(d)

31. Which of the following pictures depict the correct image of a distant object by using a concave

mirror ?

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

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

32. Sakshi has to do experiment, on finding the focal length of a given concave mirror, by using adistant object. Out of the following set ups A, B, C and D available to her in laboratory, she wouldselectA. a screen, a mirror holder, a scale, screen holder, mirrorB. a screen holder, a mirror holder and a scaleC. a mirror holder and a scaleD. a screen holder, and a scale

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

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A.

B.

C.

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

33. A student obtained a sharp image of the grill of a window in the laboratory on a screen, using a

convex lens. To determine the focal length of the lens, she should measure the distance between the

(a) lens and the window only

(b) lens and the screen only

(c) screen and the window only

(d) screen and the lens and also between the screen and the window.

(a)

(b)

(c)

(d)

34. Four Student tabulated their observations, while performing an experiment to trace the path of a ray

of light passing through a rectangular glass slab, as given below :

Students i r e

ABCD

30o

30o

30o

30o

25o

18o

17o

22o

40o

30o

30o

34.5o

Which student performed the experiment most correctly ?(a) (A) (b) (B) (c) (C) (d) (D)

i r e

ABCD

30o

30o

30o

30o

25o

18o

17o

22o

40o

30o

30o

34.5o

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

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35. The following diagrams A, B, C and D shows the positions of two Pins P1 and P2 in respect ofdistance and direction of incident ray for performing an experiment on tracing the path of a ray oflight passing through a rectangular glass slab. Which one will be the best possible option forperforming experiment correctly ?

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

A, B, C D P1 P2

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

36. After observing a slide of binary fission of amoeba, four students note down their observations as (A) cytoplasm first divides followed by the nucleus(B) nucleus first divides followed by the cytoplasm(C) both nucleus and cytoplasm divide simultaneously(D) only nucleus divides while cytoplasm remains as it isThe student who has made correct observation is(a) (A) (b) (B) (c) (C) (d) (D)

A, B, C, D

(A)

(B)

(C)(D)

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

37. After observing slide of binary fission of amoeba, teacher asked four students A, B, C and D tomention the number of individuals involved in this mode of asexual reproduction. Their responseswere (A) Two individuals are involved(B) only one individual is involved

(C) no individuals are involved(D) Three individuals are involvedCorrect response is given by :-

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

A, B, C D

(A) (B)

(C) (D)

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

38. Which one of the following does not represent budding in yeast :

(A)(B) (C) (D)

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

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

39. If you wish to observe the permanent slide of budding in yeast under the microscope, the stepsgiven below are to be followed but these are not in correct sequence (i) place the slide on the stage, look through the eye piece and adjust the mirror(ii) look through the eye piece 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 eye piece and move the slide until the object is visible

Correct sequence is (a) i, iv, ii, iii (b) iv, i, ii, iii (c) ii, i, iii, iv (d) iv, iii, ii, i

(a)

(b)

(c)

(d)

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

40. At the end of the experiment to determine the percentage of water absorbed by raisins, the raisins

are wiped just before weighing. This is to ensure that :

(a) hands do not get wet.

(b) the raisins lose water before weighing.

(c) the weighing scale does not get wet.

(d) only water absorbed by raisins is weighed.

(a)

(b)

(c)

(d)

41. A student weighed 10 raisins and found their weight as A. She then soaked them in

50 mL of distilled water in a beaker. After 2 hours, she removed the raisins, wipe them dry from

outside and weighed again and found their weight to be B. For determining the percentage of water

absorbed by raisins she should calculate using the expression :

(a)B A

100A

(b)

B A100

B

(c)B A 1

A 100

(d) (BA)100

10 A

B

(a)B A

100A

(b)

B A100

B

(c)B A 1

A 100

(d) (BA)100

- o O o -