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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 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.

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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

67039

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SECTION-A /

1. Draw the electron dot structure of Nitrogen molecule.

2. A person is advised to wear spectacles with concave lenses. What type of defect of vision is hesuffering from ?

f i

i i i i i ?

3. Decomposers are referred to as Natures cleansers. Why ?

4. How do ultraviolet radiations from the sun harm human beings ?

5. (a) Atomic number of Mg and Al are 12 and 13 respectively. Write their electronic

configuration.

(b) Mention the period of the Modern Periodic Table to which the above two elements

belong. Give reason for your answer.

(a) Mg Al 12 13

(b)

6. (a) State the Modern periodic law.

(b) What is the total number of periods and groups in Modern Periodic Table.

(a)

(b)

7. List two reasons for growing plant by vegetative propagation.

8. What is meant by puberty ? At which age human male and female attain puberty ?

9. Name the type of lens which is known as a converging lens. Draw a ray diagram to illustrate it.Mention any two uses of this type of lens.

10. Why do stars twinkle while planets do not ?

?

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11. (a) Explain how a normal human eye is able to see distinctly the object placed at a distanceas well as those placed at a nearer distance.

(b) What is the far point and near point of a normal human eye ?

(a)

(b)

?

12. What are fossil fuels ? Why are they so called ?

13. Local people around forests are referred to as stakeholders for conservation of forests. Givereasons.

14. (a) (i) Identify the product (A) formed in the following reaction-

CH3CH

2OH

Conc.H SO42

443 KAH

2O

(b) What is the function of Concentrated Sulphuric acid in the above reaction ?Define functional group.

(a) (i) (A) CH

3CH

2OH

H SO42

443 KAH

2O

(b)(c)

15. From the part of a periodic table, answer the following questions

1

Hydrogen2 13

14

Carbon15

16

Oxygen

17

Fluorine

X P Q

Y R

Z T

(a) Atomic number of oxygen is 8. What would be the atomic number of Florien ?

(b) Out of X and Q which element has larger atomic size. Give reason for your answer

Fluorine.

(c) Out of Y and Z which element has smaller atomic size. Give reason for your answer.

12 13

1415

16 17

X P Q

Y R

Z T(a) 8

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(b) X Q

(c) Y Z

16. (a) Why are testes located outside the abdominal cavity in a sac called scrotum ?(b) What are secondary sexual characters in humans ? Name one such character of male

and female.(a)

(b)

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

In human beings, the statistical probability of getting either a male or female child is 50 : 50.

Justify this statement.

50 : 50

18. Distinguish between inherited and acquired characters. Give one example for each type.

19. What are fossils ? List two informations provided by the fossils about the evolution.

20. (a) A light ray is incident obliquely on a glass slab. Diagrammatically represent the path

followed by this ray in the slab. Also label incident ray, refracted ray and emergent rayon the diagram.

(b) How is a light ray refracted when it is incident normally to the interface of two media.In this position mention the angle of incidence and angle of refraction.

(a)

(b)

21. For the given data showing focal length of three concave mirrors, A,B,C and respective distanceof different objects from these mirrors. Answer the following questions.

S. No Object distance (cm) Focal length (cm)

A 45 20

B 30 15

C 20 30

(i) In the given positions of object from the mirrors, which mirror will formthe diminished image of the object. Draw ray diagram for imageformation by this mirror.

(ii) Which mirror can be conveniently used as a make-up mirror ? Draw a ray diagram to

illustrate this function.

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A, B C

S. No (cm) (cm)

A 45 20

B 30 15

C 20 30

(i)

(ii)

22. A person is unable to read a book clearly when kept at a distance of 25cm from his eye. Namethe defect .How can it be corrected ? Draw ray diagrams for(i) defective eye (ii) Corrected eye and explain them.

e 25cm

?

23. Answer the following question :(a) Write the name of the functional group in

CH3COCH

3

(b) An organic compound burns with a sooty flame. Is it saturated or unsaturatedhydrocarbon ?

(c) Giving balanced equation state how you will convert methane to carbon dioxide.(d) Why does micelle formation take place when soap is added to water ? Will a micelle be

formed in all types of solvents ? Justify your answer.

(a) CH3COCH

3

(b)

(c)

(d) OR /

(a) Draw the structure of Bromopentane.(b) Name the Catalyst commonly used in the process of conversion of vegetable oil into

fats(vegetable ghee).(c) With the help of an activity describe esterification process using ethanol and ethanoic

acid.

(a)

(b)

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(c)

24. (a) Describe the female reproductive system with the help of a labelled diagram.

(b) What is implantation ?

(a)

(b)

OR/

(a) Describe menstrual cycle.

(b) Name and explain the method by which rhizopus reproduces.

(a)

(b)

25. (a) With respect to air the refractive index of kerosene is 1.44 and that of diamond is 2.42.Calculate the refractive index of kerosene with respect to diamond.

(b) Draw a ray diagram in each of the following cases to show the position and nature ofthe image formed when the object is placed :(i) between optical centre and principal focus (F) of a convex lens.(ii) between F and 2F of a concave lens(iii) at 2F of a convex lens

(a) 1.44 2.42

(b)

(i) F

(ii) F 2F

(iii) 2F

OR/

(a) The absolute refractive index of water is 4/3. What is meant by this statement ?(b) A pencil partially immersed in water appears to be bent. Name the phenomenon

responsible for this observation and explain it on its basis.(c) An object is placed at a distance of 25m from a concave mirror of focal length 10m. Find

the nature and position of the image so formed.(a) 4/3

(b)

(c) 10cm 25cm

SECTION - B /

26. The freshly prepared aqueous solution of ferrous sulphate appear

(a) dark green (b) pale green(c) light blue (d) dark blue

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(a) (b)

(c) (d)

27. A student dropped Zinc granules in a test tube containing FeSO4 solution. The observations

made by him after some time would be(i) No change has taken place (ii) Zn metal turns black(iii) The solution has turned turbid (iv) The solution has turned colourless(a) i and ii (b) i and iii (c) i and iv (d) ii and iv

(i) (ii)

(iii) (iv)

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

28. On mixing acetic acid with water :(a) a suspension is formed. (b) a colloidal solution is formed.(c) a homogeneous solution is formed. (d) a heterogeneous solution is formed.

(a) (b)

(c) (d)

29. Acetic acid :(a) is neutral towards litmus.(b) turns red litmus blue but does not affect blue litmus.

(c) turns blue litmus red but does not affect red litmus.(d) turns the blue litmus red and red litmus blue.

(a)

(b)

(c)

(d)

30. Gas evolved on dropping acetic acid on Na2CO3 is passed through lime water. It will beobserved that (a) it turns milky. (b) it remain colourless.(c) a white precipitate settles at the bottom. (d) it turns brown.

Na2CO3

(a) (b)

(c) (d)

31. 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. She then removed the screen andlooked through the lens in the direction of the tree. She will see :(a) an inverted image of the tree at the focus of the lens.(b) no image as the screen has been removed.(c) a blurred image on the wall of the laboratory.

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(d) an erect image of the tree on the lens.

(a)

(b)

(c)(d)

32. A teacher gives a convex lens and a concave mirror of focal length of about 20 cm each to hisstudent and asks him to find their focal lengths by obtaining the image of a distant object. Thestudent uses a distant tree as the object and obtains its sharp image, one by one, on a screen.The distances d

1and d

2between the lens/mirror and the screen in the two cases and the nature

of their respective sharp images are likely to be :(a) (20 cm, 40 cm,) and (erect, erect) (b) (20 cm, 40 cm) and (inverted, erect)(c) (20 cm, 20 cm) and (inverted, inverted) (d) (20 cm, 20 cm) and (erect, inverted)

20 cm

d1

d2

(a) (20 cm, 40 cm) (b) (20 cm, 40 cm)

(c) (20 cm, 20 cm) (d) (20 cm, 20 cm)

33. Given below are few steps (not in proper sequence) followed in the determination of focallength of a given convex lens by obtaining a sharp image of a distant object:(i) Measure the distance between the lens and screen.(ii) Adjust the position of the lens to form a sharp image.(iii) Select a suitable distant object.(iv) Hold the lens between the object and screen with its faces parallel to the screen.The correct sequences of steps is :(a) (iii), (i), (iv), (ii) (b) (iii), (iv), (ii), (i)(c) (iii), (i), (ii), (iv) (d) (iii), (ii), (i), (iv)

(i)

(ii)(iii)

(iv)

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

34. Four students A, B, C, D traced the path of a ray of light through a glass slab as shown below.

Who has traced the path correctly ?

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The student who has drawn correct path is.

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

A, B, C, D

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

35. After performing the experiment of tracing path of a ray of light through a glass slab, four

students A,B,C, D measured angle of incidence and angle of emergence and worked out the

relationship between the two as

A - i = e B - i < e C - I > e D - i = 1/e

Correct relationship has been obtained by

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

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A, B, C, D

A - i = e B - i < e C - I > e D - i = 1/e

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

36. During the process of binary fission of amoeba (a) cytoplasm first divides followed by the division of nucleus.

(b) nucleus first divides followed by the division of cytoplasm.(c) both nucleus and cytoplasm divide simultaneously.

(d) only nucleus divides while cytoplasm remains as it is.

(a)

(b)(c)

(d)

37. Daughter cells produced as a result of asexual reproduction in amoeba are :(a) exact copies of parent cell.

(b) totally dissimilar to parent cell.(c) partially similar to parent cell.(d) one is like and the other is unlike the parent cell.

(a)

(b)

(c)

(d)

38. Which out of the following sets of diagrams correctly depicts reproduction in amoeba andyeast ?

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

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

39. Following diagrams were drawn by four students A, B, C and D on having seen preparedslides of budding in yeast.

The correct diagram is :(a) A (b) B (c) C (d) D

A, B, C D

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

40. Out of the following precautions for the experiment to determine the percentage of waterabsorption by raisin the one which needs modification is(a) The stalk of the raisins should be removed before dipping them in water so that they

can absorb water easily.(b) Raisin should be clean.

(c) Raisin should be dipped in water for sufficient time.(d) Before final weighing, the soaked raisins should be gently wiped with the help of a filter

paper.

(a)

(b)

(c)

(d)

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