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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

SC 2016

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SECTION-A /

1. Given below are the formula of some functional groups

Write the names of these functional groups

2. Name the component of white light that deviates the least and most while passing through a

prism.

(i) (ii)

3. Name the group of chemical compound which adversely affects the ozone layer.

4. In which form do the plants store the trapped solar energy.

5. Nitrogen (atomic number 7) and phosphorous (atomic number 15) belong to group 15 of the

Periodic Table write the electronic configuration of these two elements. Which of these will be more electronegative and why ?

7 15 15

6. (a) State modern Periodic Law.

(b) What are groups and periods in periodic Table?

(a)

(b)

7. Explain the phenomenon of regeneration with the help of a diagram. How is regeneration

different from reproduction?

8. Fallen leaves of “Bryophyllum “ on the ground produce new plants whereas the leaves of rose

do not? Explain this difference between the two plants.

9. Light enters from air into glass plate which has refractive index 1.5. Calculate the speed of

light in glass (Velocity of light in air is 3108m/s.)

1.5

3108m/s

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10. Name the part of the eye where image is formed by the eye lens. What is the nature of the image formed? How is this image sent to the brain?

11. A student sitting at the back of the classroom cannot read clearly the letters written on the

black board. Identify the defect from which he is suffering and how is it corrected ? Draw a ray diagram for the correction of this defect.

12. What are fossil fuels? Give two examples of fossil fuels.

13. (a) Mention any two advantages of constructing dams.

(b) Name a dam which was a subject of much opposition from locals as well as NGO’s. (c) Mention any three problems which may arise due to construction of large dams.

(a)

(b) NGO

(c)

14. (a) What is micelle?

(b) Explain the cleansing action of soap with the help of diagram?

(a)

(b)

15. (a) “Silicon is classified as a metalloid.” Justify this classification.

(b) Name two more such metalloids. (c) In which part of the Periodic Table we can look for metalloids. On which side of these we can get non- metals ?

(a)

(b)

(c)

16. (a) How do organisms reproduce by fission? Write names of any two organism

which reproduce by this method. (b) Differentiate between the fission of Leishmania and Plasmodium.

(a)

(b)

17. (a) Define the following terms and give one example of each.

(i) homologous organs (ii) analogous organs b) What are the sex Chromosomes?

(a)

(i) (ii)

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(b)

18. (a) Mention the factors which could lead to the rise of a new species.

(b) With the help of an example explain how a new species are produced.

(a)

(b)

19. Mendel crossed the round and green seeded pea plants with the wrinkled and yellow seeded

pea plants. Give the phenotypic ratio of F2 generation.

F2

20. Where should an object be placed from a converging lens of focal length 20cm, so as to obtain

a real magnified image.

20 cm

21. (a) Differentiate between a converging and diverging lens with the help of diagram.

(b) Draw a ray diagram to illustrate the formation of image of an object placed in front of a concave lens.

(a)

(b)

22. (a) Mention the names of two phenomenon due to which a rainbow is formed.

(b) Explain with the help of diagram how a rainbow is formed.

(a)

(b)

23. (a) What are isomers? Draw the structural isomers of C4H10

(b) Draw the structures of (i) Benzene (ii) Cyclohexane. (c) Mention the common name for the following hydrocarbons (i) hydrocarbons with one or more double bond (ii) hydrocarbons with one or more triple bond.

(a) C4H10

(b) (i) (ii)

(c)

(i)

(ii)

OR /

Explain the following reaction with one example for each giving relevant chemical equation : (a) Hydrogenation reaction (b) Oxidation reaction (c) Substitution reaction (d) Combustion reaction (e) Saponification reaction

(a) (b)

(c) (d)

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(e)

24. (a) With the help of a diagram illustrate the germination of pollen on stigma of a flowering plant and label on it pollen grain, male germ cell, female germ cell, stigma (b) Describe the process of germination.

(a)

(b)

OR /

(a) With a set of suitable diagram, describe the process of budding as seen in yeast. (b) With the help of an example describe how some plants reproduce by spore formation.

(a)

(b)

25. (a) Two convex lenses. A and B have powers P1 and P2 respectively and P2 is greater than P1. Draw ray diagram for each lens to show which one will be more converging. Give reason for your answer. (b) A 2.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 10cm. The distance of the object from the lens is 15cm. Find the nature, position and size of the image. Also find its magnification.

(a) A B P1 P2 P2, P1

(b) 2.0 cm 10 cm.

15cm

OR /

(a) A child reads words of a book with the help of a convex lens keeping it close to book. He finds words enlarged and erect then he gradually withdraws the lens away from the book. At one position the words again become distinctly visible but this time these are enlarged and inverted. Explain this difference with the help of ray diagram for both cases. (b) A concave lens has focal length of 15cm. At what distance should the object from the lens be placed so that it forms an image at 10cm from the lens? Also find the magnification produced by the lens.

(a)

(b) 15cm

10cm

SECTION B /

26. Anjali was studying the action of Zn, Fe, Cu and Al on the salt solutions of Znso4, Feso4,

CuSO4 and Al2(so4)3. Which of the following reactions shall not proceed.

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(a) aluminium copper sulphate (b) Zinc copper sulphate (c) iron copper sulphate (d) copper copper sulphate

Zn, Fe, Cu Al Znso4, Feso4, C4SO4 Al2(so4)3

(a) (b)

(c) (d)

27. When a Zinc plate dipped in ferrous sulphate solution is taken out after 15 minutes its surface

is coated with a (a) blue coating (b) grey coating (c) reddish coating (d) black coating

15

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

28. Acetic acid smells like-

(a) Lemons (b) oranges (c) vinegar (d) bananas

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

29. While studying the properties of acetic acid Vinod added sodium bicarbonate to acetic acid

taken in a test tube. A gas was evolved when he passed this gas through lime water, it turned milky. The evolved gas is (a) O2 (b) H2 (c) CO2 (d) CH4

(a) O2 (b) H2 (c) CO2 (d) CH4 30. Anshu took 20ml of water and 20 ml of acetic acid separately in two test tubes. She mixed the

two liquids and shook them well she then allowed it to settle. After some time she would observe that (a) Acetic acid forms a separate layer above water. (b) Water forms a separate layer above acetic acid (c) A turbid solution is formed. (d) A clear solution is formed

20ml 20 ml

(a)

(b)

(c)

(d)

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31. A teacher set up the apparatus for determining focal length of a convex lens as shown below. She told them that the approximate focal length of the lens was 20cm.

She asked them to place the screen so that a distinct image of a distant tree is obtained on it by slight adjustment. Four students A, B, C, D, respectively place the screen at the mark of (A) 5cm. (B) 65cm. (C) 25cm. (D) 95cm. The student who placed it correctly is (a) A (b) B (c) C (d) D

20cm

A, B, C, D,

(A) 5cm. (B) 65cm. (C) 25cm. (D) 95cm.

(a) A (b) B (c) C (d) D 32. After performing the experiment for determining focal length of a concave mirror by focusing

a distant object on a screen, the teacher asked students to describe the nature, size and position of image. Their replies were studied and classified in four groups as- (A) Image is Virtual, inverted, smaller in size. (B) Image is real, inverted, smaller in size. (C) Image is virtual, erect, smaller in size. (d) Image is real, erect, smaller in size. Correct response are classified in : (a) A (b) B (c) C (d) D

-

A)

(B)

(C)

(D)

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(a) A (b) B (c) C (d) D 33. Meenu placed a concave mirror at 36.8cm. on an optical bench. A clear image of a distant tree

is obtained on screen placed at 18.9cm. The focal length of mirror is - (a) 17.9cm (b) 35.8cm (c) 18.9cm (d) 37.8cm.

36.8cm 18.9cm

(a) 17.9cm (b) 35.8cm (c) 18.9cm (d) 37.8cm. 34. Four students performed the experiment of tracing the path of a ray of light through a glass

slab. They were asked to label angle of incidence (i) angle of refraction (r) and angle of emergence (e) on it. Diagrams drawn by four students A, B, C, D were as shown below.

Correct labelling has been done by (a) A (b) B (c) C (d) D

(a) A (b) B (c) C (d) D 35. After performing the experiment of tracing the path of ray of light through a glass slab,

students were asked to find relation between angle of incidence (i) angle of refraction (r) and angle of emergence (e) Four students A, B, C, D presented their inference as

(A) i r, r e (B) i < r r e

(C) i > r i e (D) i > r i < e Correct inference was given by (a) A (b) B (c) C (d) D

A, B, C, D

(A) i r, r e (B) i < r r e

(C) i > r i e (D) i > r i < e

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

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36. Binary fission of amoeba commences, with the division of

(a) Cytoplasm (b) cell wall (c) nucleus (d) cell membrane.

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

37. Figures given below show the binary fission of amoeba but these are not in right sequence.

Correct sequence will be (a) I, II, III, IV, (b) IV, VII, II, I (c) II, III, I, IV, (d) III, I, II, IV

(a) I, II, III, IV, (b) IV, VII, II, I (c) II, III, I, IV, (d) III, I, II, IV 38. Yeast cells are

(a) oval (b) rectangular (c) cuboidal (d) irregular

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

39. Figures given below show budding in yeast but these are not a correct sequence .

Correct sequence will be (a) V, VI, VII (b) VII, VI, V (c) VI, V, VII (d) VI, VII, V

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(a) V, VI, VII (b) VII, VI, V (c) VI, V, VII (d) VI, VII, V 40. Ashok soaked overnight 2g of raisin in 50ml of water. It the morning, after drying them up by

blotting paper, he weighed them again and found that their weight is now 3.5g percentage of water absorbed by raisins is (a) 35% (b) 75% (c) 55% (d) 15%

2g 50ml

3.5g

(a) 35% (b) 75% (c) 55% (d) 15% 41. Veena took 50ml and 100ml of distilled water in two beakers A and B respectively she soaked

overnight 3g raisins in each of the beaker in the morning, after drying raisins with blotting paper, she weighed raisin again and observed that weight of raisins in both the beakers had increased. This increase is : (a) Same for raisins of both beakers A and B (b) double for raisins of beaker B as compared to that of A (c) four times for raisins of beaker B as compared to that of A (d) double for raisins of beaker A as compared to that of B

A B 50ml. 100ml 3g

(a) A B

(b) B A

(c) B A

(d) A B

- o O o -