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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 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 this

regard.

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 other

electronic 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

67015

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SECTION-A /

1. Write the structural formula of butane, C4H10

C4H10

2. Name the part in human eye having light sensitive cells.

3. "Flow of energy is unidirectional". Name the first two components of the environment involved

in this flow of energy from the sun.

4. List the problems caused by non-biodegradable wastes ?

5. (a) Magnesium oxide is MgO. What is the formula of Magnesium sulphate ?

(b) Why do elements in a group have same chemical properties ?

(a) MgO

?

(b) () ?

6. The elements of second and third period of the periodic table are given below :

Li Be B C N O F

Na Mg Al Si P S Cl

(a) Which atom is bigger in size Li or Be ? Why ?

(b) Which one element out of those given above is most metallic and why ?

- :Li Be B C N O F

Na Mg Al Si P S Cl

(a) Li Be ?(b) ?

7. What are called sexually transmitted diseases ? Give one example of such disease spread bybacteria and one example of disease spread by virus?

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8. Write the significance of sexual reproduction.

9. The following table gives the values of refractive indices of some media :

Medium Alcohol Benzene Kerosene Turpentine oil

Refractive index 1.36 1.50 1.44 1.47

Light passes through these media one by one. Arrange these in the increasing order of the speed

of light through them.

1.36 1.50 1.44 1.47

10. An aged person is unable to see distinctly nearby as well as distant objects.(i) Name the defect of vision he is suffering from.(ii) State the kind of lens required to correct his vision. How is this lens made ?

(i)

(ii)

11. Draw a labeled ray diagram to show the formation of a rainbow.

12. There was a huge opposition from the local population, during the construction of Tehri dam.On which river was this dam constructed ? Mention any two reasons for this opposition.

13. Suggest any two ways in which you can reduce energy consumption in your homes so thatconsumption of fossil fuels is reduced.

14. (a) What is scum ? How is it formed ?(b) What are detergents ? How are they effective even in hard water ?

(a)

(b)

15. State modern periodic law. List the characteristics that are determined by knowing the position

of an element in the periodic table.

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- ?

16. (a) Name the part of female reproductive system where fertilization takes place in humanbeings.

(b) What is called implantation ? Where does implantation takes place ? Mention its

structure and function.(a)

(b) implantation

17. Mention how sex determination takes place in certain animals ? How is it different to that of

sex determination in human being ?

18. Identify and define the phenomenon involved in the following genetical situations :

19. (a) What do the following organs depict from evolutionary point of view ? Forelimbs of

frog and lizard, wings of bird and human hand.

(b) What evidence do they provide in evolutionary point of view. Write reason for your

answer.

(a)

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(b)

20. Draw ray diagram for the following cases and state the position and nature of the image

formed, when the object is placed :

(i) between C and F of a concave mirror.

(ii) beyond C of a concave mirror.

(i) C F

(ii) C

21. A 4.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length

25 cm. The distance of the object from the lens is 20cm. Find the (i) position, (ii) nature and

(iii) size of the image formed.

4.0 cm 25 cm

20 cm (i) (ii)

22. What is meant by dispersion of white light ? State a possible cause of such dispersion. A glassprism is able to produce a spectrum when white light passes through it, but a glass slab doesnot produce any spectrum, why ?

23. (a) Write the names of the following(i) HCHO

(ii) CH3CH2CH2OH

(ii) CH3CH2CH2COOH

(b) What happens when ethanol is heated at 443 K with excess of concentrated H2SO4

(c) What are catalyst ?

(a)

(i) HCHO

(ii) CH3CH2CH2OH

(ii) CH3CH2CH2COOH

(b) 443 K H2SO4

(c)

OR/

(a) Give the electron dot structures of the following :(i) Methane (ii) Ethyne (iii) Ammonia

(b) Draw the structures of the following :(i) Bromoethane (ii) Hexyne

(a)

(i) (ii) (iii)

(b)

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(i) (ii)

24. (a) Write advantages of vegetative propagation.(b) Draw a neat labeled diagram of a plant showing vegetative propagation.(c) Specify the part involved in reproduction and explain the process in any two plants.

(a)

(b)

(c)

OR/

(a) Draw neat labeled diagrams of the following asexual types of reproduction(i) Regeneration in planaria(ii) Budding in hydra

(b) Name the type of cells which hydra use for the process of budding.

(a)

(i)

(ii)(b)

25. (i) Define power of a lens and state its S.I. unit.

(ii) Which lens behaves as (a) convergent lens (b) divergent lens ?

(iii) Define absolute refractive index of a given medium.

(iv) Light enters from air into diamond which has refractive index of 2.42. Calculate the speed

of light in diamond. The speed of light in air is 3108 m/s.

(i) S.I.

(ii) (a) (b)

(iii)

(iv) 2.42 3108 m/s

OR/

(i) What is meant by principal focus of a convex lens ? Illustrate it with a suitable ray

diagram.

(ii) When sunlight is concentrated at a paper placed at the principal focus of a convex lens,

what happens to the paper and why ?(iii) Which mirror is used as a rear view mirror of a vehicle ? Why ?

(i)

(ii)

(iii)

SECTION - B /

26. A student took four test tubes and added 10 mL freshly prepared FeSO 4 solution to each test

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tube. Then he introduced a strip of copper, iron, zinc and aluminium, each metal in a differenttest tube. A black residue of iron was obtained only in two of the test tubes. They are those inwhich the following strips were introduced :(a) Copper and Zinc (b) Aluminium and Copper(c) Iron and Aluminium (d) Zinc and Aluminium

10 mL FeSO4

(a) (b)

(c) (d)

27. A piece of granulated zinc was dropped into copper sulphate solution. After some time the

colour of the solution changed from :

(a) Blue to Red (b) White to Blue

(c) Blue to Colourless (d) White to Yellow

(a) (b)

(c) (d)

28. A student took four test tubes A, B, C and D containing sodium chloride,sodium hydroxide, sodium carbonate and sodium hydrogen carbonaterespectively. On adding dilute acetic acid to these test tubes he wouldobserve evolution of a colourless and odourless gas from the test tubes

marked :(a) A and B (b) B and C

(c) C and D (d) D and A

A, B, C, D : ,

,

:

(a) A B (b) B C

(c) C D (d) D A

29. A colourless solution smells like vinegar and turns blue litmus red. Thissolution is :

(a) hydrochloric acid (b) nitric acid

(c) acetic acid (d) sulphuric acid

-

(a) (b)

(c) (d)

30. Equal volumes of acetic acid and distilled water are mixed together and

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shaken in a test tube. The resulting mixture after standing would appear asshown in figure.

(a) A (b) B

(c) C (d) D

?

(a) A (b) B

(c) C (d) D

31. A student was asked to obtain real image of a tree on the screen with the help of suitable mirror.He can do so by taking a -(a) concave mirror(b) plane mirror(c) convex mirror

(d) both either by concave or by convex mirror

(a) (b)

(c) (d)

32. A student places a convex lens in front of sun rays entering a room from window. The rayswould meet at -(a) focus of lens (b) centre of curvature of lens(c) pole of lens (d) optical centre of lens

Water

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i r e

I 30 15 31

II 40 30 39

III 50 33 52

IV 60 28 59

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

36. Out of the following four diagram, select the one in which the stage at which nuclear fission andcytokineses in amoeba are observed :

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

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

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

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38. To prepare a culture of yeast cells yeast powder is added to :

(a) Soap solution (b) 10% sugar solution

(c) Hydrochloric acid (d) Salt solution

(a) (b) 10%

(c) (d)

39. Four students drew following diagrams of budding in yeast after observing its slide.

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Which student has drawn it correctly

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

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

40. Find out the percentage of water absorbed by raisins, if weight of dry raisin5g and weight ofsoaked raisin7g(a) 20% (b) 30% (c) 40% (d) 50%

5g 7g

(a) 20% (b) 30% (c) 40% (d) 50%

41. A student dissolved 1g of sugar in 10 mL of distilled water in beaker A and 10g sugar in100 mL of distilled water in B. He put 5 raisins in each beaker. After 2 hrs he observed that -(a) Raisins swollen up in beaker A and contracted in B(b) Raisins contracted in A and swollen up in B(c) Swollen up in both(d) contracted in both

1g A 10 mL B 10g 100 mL

5- 2

(a) A B

(b) A B

(c)

(d)