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Important Instructions for theSchool 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 of Central Board of Secondary Education and no one including the user school is allowed topublish, 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 Schoolbased 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, 2012II, 2012

SCIENCE /

Class X / X

Time allowed : 3 hours Maximum Marks : 803 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 appropriateresponse 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 2023

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SECTION-A /

1. An organic compound burns with a sooty flame. Is it saturated or unsaturated compound? Justify.

2. The sky appears dark to the passengers flying at very high attitudes. Why ?

3. Name the compound responsible for the depletion of ozone layer ?

4. Why are green plants called producers ?

5. Two elements X and Y have atomic numbers 12 and 16 respectively. To which period ofthe modern periodic table do these two elements belong ? What type of bond will beformed between them and why ?

X Y 12 16

6. How does the atomic radius change as we go(a) from left to right across a period ?

(b) down a group in the periodic table ?(a)(b)

7. What is reproduction ? Mention the importance of DNA copying in reproduction.DNA

8. Describe the role of the following in human beings.(a) Ovary (b) Prostate gland

(a) (b)

9. The refractive index of a dense flint glass is 1.65 and for alcohol it is 1.36 with respect toair. Find the refractive index of dense flint glass with respect to alcohol.

1.651.36

10. Draw a ray diagram to show refraction of light through a triangular glass prism and showangle of incidence and angle of deviation.

11. A child has difficulty in reading the blackboard while sitting on the last bench in a class

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room. What could be the defect the child is suffering from ? List two main causes of thisdefect.

12. List four stakeholders of forests.

13. What is water harvesting? Mention any two water harvesting structures.

14. (a) Give a chemical test to distinguish between saturated and unsaturatedhydrocarbons.

(b) Name the products formed when ethanol burns in air. List two forms of energythat are librated on burning ethanol.

(c) Why is the reaction between methane and chlorine considered a substitution

reaction?(a)(b)

(c)

15. The position of three clements A, B and C in the periodic are shown below :Groups I II III IV V VI VII VIIIPeriods

12 B3 A C

Giving reason to explain the following:(a) Element A is a metal.(b) Element C has larger size than B .(c) Element B has a valency of 3.

A, B C

I II III IV V VI VII VIII

12 B3 A C

(a) A(b) C B(c) B 3

16. List three advantages of vegetative propagation.

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17. How do Mendel experiments show that traits may be dominant or recessive ?

18. (a) Name the type of sex chromosome present in (i) human male and (ii) humanfemale.

(b) What will be the sex of the offspring if a sperm carrying X Chromosome fertilizes

the egg ?(c) Why is DNA copying essential ?(a) (i) (ii)(b) X (c) DNA

19. What are fossils? List two methods by which the age of fossils are determined.

20. Refractive index of diamond with respect to glass is 1.6 and absolute refractive index ofglass is 1.5. Find (i) absolute refractive index of diamond (ii) Speed of light in diamond.The speed of light in air is 3 108 m/s.

1.6 1.5 (i)

(ii) 3 108 m/s

21. Name a mirror that can give an erect and magnified image of an object. Draw labelled raydiagram to justify your answer.

22. (a) Define power of accommodation of eye .(b) A person uses a lens of power -2.0D for correcting his distant vision. For correcting

his near vision he uses a lens of power +1.5D. What is the focal length of the lensesrequired to correct this disorder ?

(a)(b) 2.0D

1.5D

23. An organic compound A is widely used as a preservati ve in pickles and has a molecularformula C 2H 4O2. The compound reacts with ethanol in presence of an acid to form a sweetsmelling compound B.(a) Identify the compound A .(b) Write the chemical equation for its reaction with ethanol to form compound B .(c) How can you get A back from B? (d) Name the process and write the corresponding chemical equation.(e) Which gas is produced when compound A reacts with washing soda? Write the

chemical equation.A C2H4O2

B(a) A

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(b) A B

(c) B A(d)(e) A

OR/ (a) Why does carbon form large number of compounds ?(b) Why are some carbon compounds saturated and some unsaturated ?(c) Which of the two is more reactive ?(d) Write the name of the following:

(i) CH 3 CH 2 Br(ii) CH 3- CH 2- CH 2- CH = CH CH 3

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

(i) CH 3 CH 2 Br(ii) CH 3- CH 2- CH 2- CH = CH CH 3

24. Explain the sexual reproduction in plants with the help of a diagram and label thefollowing parts.Female germ cell, male germ cell, stigma and ovary.

OR/ (a) What is the role of placenta in human females ?(b) What happens if the egg is not fertilized ?(c) If a woman is using copper - T, will it help in protecting her from sexually

transmitted diseases ?(a)(b)(c) T

25. (a) State Snells Law. (b) A beam of light passes from air to a substance X. If angle of incidence is 45 degrees

and angle of refraction is 30 degrees, calculate the refractive index of substance X.Given sin 30 = 12 ; sin 45 =

12

.

(c) A convex lens forms a real and inverted image of a needle at a distance of 50 cmfrom it. Where is the needle placed if the size of the image is equal to the size of theobject ? Calculate the power and focal length of the lens.

(a)(b) X 45 30

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X

sin 30 = 12

; sin 45 = 12(c) / 50 cm

OR/ (a) An object is placed at a distance of 60 cm from a convex mirror the

magnification produced is 1/2 . Where should the object be placed to get amagnification of 1/3 ?

(b) A small electric lamp is placed at the focus of a convex lens. State the nature ofbeam of light produced by the lens. Draw a diagram to show this.

(a) 60 cm 12

13

(b)

SECTION-B /

26. An iron nail is suspended in copper sulphate solution and kept for a while. It is observedthat the solution(a) Remains blue and a coating is formed on the nail.(b) Turns green and a coating is found on the nail.(c) Remains blue and no coating is formed on the nail.

(d) Turns green and no coating is found on the nail

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

27. Four students A, B, C and D noted the initial colour of the solutions in beakers, I, II, III and

IV. After inserting zinc rods in each solution and leaving it undisturbed for two hours,noted the colour of each solution again.

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They recorded their observation in the form of table given below.Student Color of

the

Solution

I II III IV

A Initial

Final

Colorless

Colorless

Colorless

Colorless

Lightgreen

Colorless

Blue

colorlessB Initial

Final

Colorless

Colorless

Lightyellow

Colorless

Lightgreen

Lightgreen

Blue

ColorlessC Initial

Final

Colorless

Light blue

Colorless

Colorless

Light

Green

Colorless

Blue

Light

BlueD Initial

Final

LightGreen

Colorless

Colorless

Colorless

Lightgreen

Darkgreen

Blue

ColorlessWhich student noted the color change in all the four beakers correctly?(a) A (b) B (c) C (d) D

A, B, C D I, II, III IV

I II III IV

A

B

C

D

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(a) A (b) B (c) C (d) D28. When you open the bottle containing acetic acid you find that its odour resembles with

(a) Tomato juice (b) Kerosene(c) Orange juice (d) Vinegar

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

29. 2mL of ethanoic acid was taken in each of the three test tubes A, B and C and 2mL, 4mLand 8mL of water were added to them respectively. A clear solution is obtained in(a) Test tube A only (b) Test tube A and B only(c) Test tube C and B only (d) All the test tubes.

A, B C 2mL 2mL, 4mL 8mL

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

30. A student is asked to add a tea spoon full of solid NaHCO 3 to a test tube containingapprox. 3mL of acetic acid. He observed that the solid NaHCO 3(a) Floats on the surface of the acetic acid(b) Remains suspended in the acetic acid(c) Settles down in the test tube(d) Reacts with acetic acid and a clear solution is formed

NaHCO 3 3mLNaHCO 3(a)(b)(c)(d)

31. To determine the focal length of a concave mirror a student focuses a distant object withthe mirror. For best results the chosen object should be(a) a tree (b) a tall building(c) a window (d) the sun

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

32. A student obtained a blurred image of a distant light house on a screen using a convexlens. In order to obtain a sharp image of the same object on the screen he will have to shiftthe lens :(a) towards the screen(b) towards the object(c) Either towards or away from the screen depending upon the position of the object(d) away from the screen.

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

33. Out of the following, the best way to do the experiment on determining the focal length ofa concave mirror by obtaining the image of a distant object on a screen is to(a) Keep both the mirror and screen in suitable stands with the screen put in front of

the mirror(b) Keep both the mirror and screen in suitable stands with the screen put behind the

mirror(c) hold the mirror in hand and keep the screen in a stand kept behind the mirror(d) hold the mirror in a stand and hold the screen in hand with screen infront of the

mirror.

(a)(b)(c)

(d)

34. A student carries out experiment of tracing the path of a ray of light through a rectangularglass slab for two different values of angle of incidence : i 30 and i 45 . The set ofvalues of the angle r and e he is likely to obtain in two cases respectively are :(a) [ r 30 , e 20 ] and [ r 45 , e 28 ](b) [ r 20 , e 30 ] and [ r 45 , e 28 ](c) [ r 20 , e 30 ] and [ r 30 , e 45 ](d) [ r 30 , e 20 ] and [ r 30 , e 45 ]

i 30 i 45

r e

(a) [ r 30 , e 20 ] [ r 45 , e 28 ](b) [ r 20 , e 30 ] [ r 45 , e 28 ](c) [ r 20 , e 30 ] [ r 30 , e 45 ](d) [ r 30 , e 20 ] [ r 30 , e 45 ]

35. Three students A,B and C traced the path of a ray of light through a glass slab as shown.

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The correct path is traced by :(a) A only (b) B only (c) C only (d) Both A and B

A, B C

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

36. In the slides showing binary fission in amoeba and budding in yeast, the correctobservations are :(a) The daughter cells of amoeba and the bud of yeast are smaller than their respective

parental cells(b) The daughter cells of amoeba and the bud of yeast are of the same size as their

respective parental cells(c) The daughter cells of amoeba are bigger than the parental cells but bud of yeast is

smaller than the parent.(d) The daughter cells of amoeba are smaller than the parent but bud of yeast is larger

than parent.

(a)(b)

(c)

(d)

37. The following figures illustrates binary fission in Amoeba in an incorrect sequence

The correct sequence is(a) II, III, I, IV (b) III, II, IV, I (c) IV,II, III, I (d) II, III, IV, I

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

38. Budding results in the production of new individual.(a) Due to sexual reproduction in parents(b) From an outgrowth of the parent individual

(c) Having no nucleus(d) From germination of spore

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

39. Out of four slides I, II, III and IV whose details are shown below, which one should befocused under the microscope for showing budding in yeast?

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

(a) I (b) II (c) III (d) IV40. Each of the three beakers A, B and C contained 50mL of distilled water. A student placed

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five raisins in each beaker. The raisins for each beaker weighed the same. The beakerswere kept at room temperature. The raisins were removed from beaker A after 10minutes, from beaker B after 20 minutes and from beaker C after one hour. On calculatingthe percentage of water absorbed by the raisins, it was found that(a) Maximum absorption of water by raisins was in beaker C(b) Maximum absorption of water by raisins was in beaker B

(c) Minimum absorption of water was by raisins in beaker C(d) Absorption of water was equal in raisins of all the three beakers.A, B C 50mL 55

A10 B 20 C

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

41. While performing an experiment to determine the percentage of water absorbed byraisins, the following data was obtained:Mass of water taken in the beaker = 50gMass of raisins before soaking them in water = 5gMass of raisins after soaking in water for 2 hours = 8gThe percentage of water absorbed by raisins would be :

(a)(8 5)g 100

8g (b)

(8 3)g 1008g

(c)(8 5)g 100

3g(d)

(8 5)g 1005g

= 50g= 5g

= 8g

(a)(8 5)g 100

8g (b)

(8 3)g 1008g

(c)(8 5)g 100

3g(d)

(8 5)g 1005g

- o O o -