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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 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

67028

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SECTION-A /

1. Write the structural formula of Propene.

2. What is the nature of eye lens of human eye and that of the image formed at the retina of the

eye by it ?

3. Mention the percentage of energy of plants that is fixed in the animal flesh, when plants are

eaten by same animals ?

4. Which of the following produces maximum green house effect ?

SO2, CO2, CFC

SO2, CO2, CFC

5. (a) State modern periodic law.(b) How does the electronegativity changes as we move from left to right across a period.

Give reason for your answer.(a)

(b)

6. (a) State the similarity in the electronic configuration of all the elements present in Group1 of the periodic table?

(b) An element has atomic number 3. To which period of the periodic table does it belong ?Give reason for your answer.

(a)

(b) 3

7. (i) Identify the diseases caused by bacteria and the one caused by virus from the following: syphilis, warts(ii) Mention any two methods for safe sex.

(i)

(ii)

8. (a) Specify the event which occur in the reproductive system of a human female

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(i) if egg is fertilised.(ii) if egg is not fertilised

(b) Mention the changes that take place in uterus in both the above events.

(a)

(i)

(ii)

(b)

9. A ray of light passing through the principal focus of a concave mirror is incident on it with thehelp of a ray diagram. Show the direction of the reflected ray. Also mark the angle ofincidence and angle of refraction in the ray diagram.

10. The near point of a hypermetropic eye is 50 cm. What is the nature and power of the lens

required to enable him to read a book placed at 25 cm from the eye ?50 cm

25 cm

11. What is meant by scattering of light ? Why is the colour of sky blue ?

12. Name the products formed after combustion of fossil fuels in :(i) insufficient air(ii) sufficient air

Which of those products leads to global warming ?

(i)

(ii)

13. List the stake holders in conservation of forests and mention their stakes too.

14. (a) Select alkenes and alkynes from the following :C

2H

4, C

3H

4, C

2H

2, C

4H

8

(b) How can hardness of water be tested with the help of soap solution ?(c) Draw electron dot structure for nitrogen molecule.

(a)

C2H

4, C

3H

4, C

2H

2, C

4H

8

(b)

(c)

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15. Group 1 2 13 14 15 16 17 18

PERIOD

1 X B C D E

2 Y

3 Z

Using the given part of the periodic table, answer the following questions with reason (a) Name the element having smallest atomic size(b) Write electronic configuration of element E(c) Identify the elements to which element Y has similar physical and chemical properties.

1 2 13 14 15 16 17 18

1 X B C D E

2 Y

3 Z

(a)

(b) E

(c) Y

16. (a) What are thread like structure that develop in bread mould.(b) What are tiny swollen structure at the top represent and what does it contain ? Mention

some adaptive features of it.

(a)

(b)

17. (a) What is meant by speciation ?(b) Name the vegetable crops made from wild cabbage by artificial selection when farmers

opted for(i) arrested flower development(ii) sterile flowers(iii) swollen parts(iv) large leaves

(a)

(b)

(i)

(ii)

(iii)

(iv)

18. A pea plant with tall plant and violet flowers (TtVV) were crossed to short plant with whiteflowers (ttvv). Find out the phenotypes and genotypes of offspring obtained as a result of thiscross.

/ (TtVV) (ttvv)

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19. Define a fossil. How do fossils provide evidence in favour of evolution.

20. (a) Define magnification produced by a lens. Express it in terms of image distance andobject distance from a concave lens.

(b) Find out the relative magnification of an object which when placed at a distance of

20 cm from convex lens, its real image is formed at 40 cm on the other side fromconvex lens.

(c) What will be the nature of image in the above case (b) ? Whether it will be erect orinverted ?

(a)

(b) 20cm 40cm

(c)

21. (i) Differentiate between reflection and refraction .(ii) A lemon kept in water in a glass tumbler appears to be bigger than its actual size, when

viewed from the sides. Explain why it so appears ?

(i)

(ii)

22. A boy uses lens of focal length 40 cm in his spectacles. Name the defect of vision he issuffering from. State two main causes of this defect of vision.

40 cm

23. (i) Complete the following equation and answer the questions given

43 2

Alkaline KMnO HeatCH CH OH

(a) Name the products obtained in above reaction.(b) Why is alkaline KMnO

4used in the above chemical change ?

(ii) Explain the property of catenation of carbon.(iii) What are covalent bonds ? Give any two properties of covalently bonded molecule.

(i)

43 2

KMnOCH CH OH

(a)

(b) KMnO4

(ii)

(iii)

OR(i) Write the chemical reaction involved when Ethanol and Ethanoic acid react in the

presence of an acid.(ii) Why is acid added in the above reaction ?(iii) Name the functional groups present in Ethanol and Ethanoic Acid.(iv) Differentiate between saturated and unsaturated hydrocarbons.

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(i)

(ii)

(iii)

(iv)

24. (a) Differentiate between sexual and asexual reproduction. Identify the mode which ismore beneficial to produce variations in organisms and why ?

(b) Mention any four methods of asexual reproduction.(c) Mention the role of cotyledon and plumule in germination.

(a)

(b)

(c)

OR/

(a) Draw a neat diagram of a longitudinal section of a flower and label on it ovary,anther, stigma, style

(b) Explain the process of germination with the help of diagram of germination of pollen onstigma.

(a)

(b)

25. (a) With the help of a ray diagram, explain the converging nature of a convex lens.

(b) Describe an activity to illustrate this property of convex lens.(c) A convex lens of focal length 20 cm forms a virtual image at distance of 15 cm from thelens. Find the position of the object and magnification produced by the lens.

(a)

(b)

(c) 20cm 15cm

OR/

(i) Draw a ray diagram in each of the following cases :

(a) when object is placed at centre of curvature of a concave mirror.

(b) between pole and principal focus of a concave mirror.

(ii) The size of image formed by a convex mirror of focal length 15 cm is one-third the size

of the object. Find the position of object and image. What is the nature of the

image ?

(i)

(a)

(b)

(ii) 15 cm

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SECTION - B /

26. If copper turnings are added to each of the 4 solutions A, B, C, D as shown below, it would beobserved that :

(a) Colour of solution changes in A and B(b) Colour changes in none of the test tubes(c) Colour of solution changes in A and C

(d) Colour of solution changes in B and DA, B, C,D

(a) A B (b)

(c) A C (d) B D

27. Look at the figures given below :

If reaction takes place in A, B and C, which of the following metals is the most reactive ?(a) Al (b) Zn (c) Cu (d) Fe

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A, B C

(a) Al (b) Zn (c) Cu (d) Fe

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

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 ?

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

10 mL 10 mL

(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

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(I) (II)

(III) (IV)

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

31. In the experiment of determining the focal length of a given concave mirror by forming imageof a distant object, the best suitable choice of material to act as a screen would be :(a) White sheet of paper (b) Wooden board(c) Wall (d) White paper pasted on wooden board

(a) (b)

(c) (d)

32. In an experiment to determine the focal length of a convex lens, a student obtained a sharpinverted image of a distant tree on the screen behind the lens. He then moved the lens slightlyaway from the screen. Now, the image of the same tree on the screen would appear :(a) slightly large and blurred(b) slightly small and blurred(c) of same size as before but slightly blurred(d) point sized

(a) (b)

(c) (d)

33. A concave mirror is used to form a clean image of a distant object on a screen. The focal lengthof the mirror can be determined by measuring the distance between the :(a) object and the mirror (b) object and the screen(c) object and its image (d) mirror and screen

(a) (b)

(c) (d)

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34. In an experiment on tracing the path of a ray of light through a rectangular glass slab, four

students A, B, C, D used the following values of angle of incidence and the distance between

the feet of the two pins respectively as

(A) (30, 45, 60) and 1 cm

(B) (30, 45, 80) and 6 cm

(C) (15

, 45

, 60

) and 1 cm(D) (30, 45, 60) and 6 cm

Which student is likely to get the most accurate results for all values of i .

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

A, B, C, D

(A) (30, 45, 60) 1 cm

(B) (30, 45, 80) 6 cm

(C) (15, 45

, 60

) 1 cm

(D) (30, 45, 60) 6 cm

i

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

35. While performing the experiment to trace the path of ray through glass slab, the teacher

instructed her students to ensure that during the experiment, glass slab may not get displaced

from its boundary. This instruction was given because if slab gets displaced from its boundary

then

(i) the angle of incidence of ray will change.

(ii) the diagram will not look nice.

(iii) the refracted ray will not be traceable.

(iv) the emergent ray will not be seen.

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

(i)

(ii)

(iii)

(iv)

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

36. Following diagrams were drawn by four students after observing a slide of binary fission in

amoeba. The diagram correctly depicting a stage of binary fission in amoeba

is :

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

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

37. After observing prepared slides illustrating binary fission in Amoeba, following figures were

drawn by a student which may not be in proper sequence.

The correct sequence of these figures is :

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

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

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

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

38. Identify the mistake in the following sketch of budding in yeast.

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(a) Bud is shown to be smaller than parent cell.

(b) Nuclei are present in both bud and parental cell.

(c) Both parent and bud are shown as single cells.

(d) Bud is wrongly labelled.

(a)

(b)

(c)

(d)

39. The following sequence shows the stages in budding in yeast but this sequence is not correct

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

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

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

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