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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

67029

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SECTION-A /

1. Which two of the following compounds could belong to the same functional group ?C2H6O2, C2H6O, C2H6, CH4O.

C2

H6

O2

, C2

H6

O, C2

H6

, CH4

O.

2. Mention the role of iris and pupil in human eye.

3. In a food chain why does maximum amount of pesticides gets accumulated in human body ?

4. Which of the following can adversely affect our environment and why ?Jute, glass, latex of plant, plastic.

5. What is meant by the metallic character of an element ? How does it vary in a group ofperiodic table when we move down ?

6. Find the valency of magnesium having atomic number 12 and sulphur having atomicnumber 16 ?

1216

7. Mention any two advantages of vegetative propagation. Give one example for each of thefollowing :(i) Plants in which vegetative propagation occur by grafting.(ii) Plants in which vegetative propagation occur by leaves.

(i)

(ii)

8. Differentiate between male and female germ cells.

9. Define optical centre and principal axis of a lens. Show the path of the refracted ray, when aray of light is incident towards the optical centre of concave lens.

10. Explain the formation of rainbow in the sky.

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11. (a) A ray of white light falls obliquely on one of faces of a triangular glass prism as shownin the figure. Draw the path of rays after refraction from prism.

(b) Define dispersion of light

(a)

(b)

12. Why is it necessary to make judicious use of fossil fuels ? Write any two reasons.

13. List any four advantages of water stored as ground water.

14. An organic compound X is an essential constituent of wine and beer. X is responsible forintoxication caused by these drinks. Oxidation of X yields an organic acid Y which is present invinegar. Name the compounds X and Y and write their structural formulae.

X X

X Y X Y

15. State Modern Periodic Law. Mention the total number of groups and periods respectively inModern Periodic Table. Mention the names of elements of first period.

16. Draw a neat diagram of human-female reproductive system and label on it Uterus, Cervix,Oviduct and ovary.

17. (a) Define Fossil.(b) What are homologous organ ? How do these organs provide evidences in favour of

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evolution ?

(a)

(b)

18. (a) Mention the name of food plant from which cauliflower and Kohlrabi were evolved.(b) Mention the traits on the basis of which these crops are selected artificially ?

(a)

(b)

19. A round green seeded plant (RRyy) is crossed to a wrinkled yellow (rrYY) seeded plant.

Findout phenotypes and genotypes in F1 and F2 generation with the help of a cross.

(RRyy) (rrYY)

F1 F2

20. (i) Why do we prefer to use :

(a) a convex mirror as a rear view mirror in vehicles ?(b) a concave mirror in search lights ?(ii) Give the value of (a) the angle of incidence, and (b) the angle of reflection for normalincidence of light on a concave mirror ?

(i)

(a)

(b)

(ii)

21. (i) State Snells law of refraction.

(ii) In the given figure, identify the medium that is optically denser. Give reason foryour answer.

(i)

(ii)

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22. A student sitting at the back of the classroom cannot read clearly the letters written on theblackboard. What kind of defect in vision is she suffering from ? State two causes of this defect.Draw ray diagram for the correction of this defect.

23. (a) What is a homologous series of organic compounds ? State any two characteristics of ahomologous series.

(b) What would be observed on adding 5% solution of alkaline potassium permanganatedrop by drop to some warm alcohol taken in a test tube ? Write the name of thecompound formed during the chemical reaction.

(c) Write a chemical test to distinguish between ethanol and ethanoic acid.

(a)

(b) 5%

(c)

OR/

(a) What happens when hydrogen gas is passed through vegetable oil in presence ofnickel ? Mention one difference between physical property of vegetable oil and theproduct so obtained.

(b) Write the structural formula of any two isomers of pentane (C5H12).

(c) Draw the electron dot structures for(i) Propanone (CH3COCH3) (ii) Ethanoic acid (CH3COOH)

(a)

(b) (C5H12)

(c) (i) (CH3COCH3) (ii) (CH3COOH)

24. (a) List four modes of reproduction used by single organism. Give name of one organismwhich uses each mode.

(b) Differentiate between sexual and asexual modes of reproduction.

(a)

(b)

OR/

(a) Draw the diagram of longitudinal section of a flower and label on it the followingparts Style, stigma, anther, ovary

(b) Mention the advantage of seed formation for a plant. What is the role of plumule ingermination.

(a)

(b)

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25. (i) State the relation between object distance, image distance and focal length of a sphericalmirror.

(ii) A convex mirror of focal length 20 cm forms an image of an object kept at a distance of30 cm from the mirror. Find the position and nature of the image formed by it.

(iii) Draw ray diagrams to show the image farmation by a concave mirror when an object isplaced :(a) between F and C of the mirror.(b) between pole (P) and F of the mirror.

(i)

(ii) 20 cm 30 cm

(iii)

(a) F C

(b) F

OR/

(i) Which lens is also known as converging lens ? Justify your answer with the help of anactivity and a suitable ray diagram.

(ii) A concave lens has focal length of 20 cm. At what distance from the lens a 10 cm tallobject be placed so that it forms an image at 15 cm from the lens ? Also calculate thesize of the image formed.

(i)

(ii) 20 cm 10 cm

15 cm

SECTION - B /

26. Which observation of the experiment conducted by a student, in which he reacted an iron nailwith copper sulphate solution is correct ?

S. No. Initial colour ofsolution

Final colour ofsolution

Change in the colour of iron nail

a Blue Colourless Grey coating on iron nail

b Blue Light green Brown coating on iron nail

c Light green Blue Brown coating on iron naild Blue Blue Brown coating on iron nail

a

b

C

d

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27. Which one is observed when you dip Zn, Fe and Cu plates in to three different test tubescontaining aluminium sulphate solution ?(a) The solution changes from colourless to light green.(b) A brown mass is deposited on the surface of each metal.(c) Each test tube becomes hot after sometime.(d) No change occurs.

Zn, Fe Cu

(a)

(b)

(c)

(d)

28. Four different students recorded their observations as tabulated below for studying thechemical property of acetic acid when it is added to sodium bicarbonate, who recorded thecorrect observation?

Student Observation

ABCD

No change takes place.A gas is evolved very slowly

A brisk effervescence is observedAn insoluble substance is formed

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

ABCD

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

29. Odour of acetic acid is like :(a) vinegar (b) orange (c) rotten egg (d) scent

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

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30. some time the correct observation would be :

(a) Water formed a separate layer at the bottom(b) Ethanoic acid formed a separate layer at the bottom(c) The mixture became white in color(d) A clear solution was formed

(a) (b)

(c) (d)

31. For obtaining a real image of a distant tree by a concave mirror to find its focal length, theposition of the screen should be :(a) behind the mirror(b) on the same side of object between centre of curvature and infinity(c) on the same side of object between focus and pole(d) At the focus of mirror

(a)

(b)

(c)

(d)

32. After performing the experiment to determine focal length of a convex lens by focussing adistant object, a teacher asked Veena to draw a ray diagram of her experiment and show where

she placed the screen for getting sharp image. The figure drawn by her is given below.

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The point at which she had placed the screen during her experiment was(a) at A (b) at B (c) at C (d) at D

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

33. For the experiment on finding the focal length of a convex lens by obtaining the image of adistant object, a laboratory assistant keeps the following apparatus on the table :(I) An optical bench with the scale(II) A stand with a convex lens fitted in it(III) A thick cardboard white screen

(IV) A stand with a metal needle fixed in it.A student can do the experiment by using the apparatus(a) I, II, IV (b) I, III, IV (c) I, II, III (d) II, III, IV

(I)

(II)

(III)

(IV)

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

34. A student traces the path of a ray of light passing through a rectangular glass slab as shown.Which is the angle of refraction out of the following :-

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(a) PQN1 (b) N2QR (c) DQR (d) M2RE

(a) PQN1 (b) N2QR (c) DQR (d) M2RE

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

measures the angle of incidence i, angle of refraction r and angle of emergence e for all hisobservations. After completing the experiment, he would conclude that :

(a) i > r ;ie (b) i < r ; ie

(c) i > r ;i >e (d) i < r ; i < e

(i), (r) (e)

(a) i > r ;ie (b) i < r ; ie

(c) i > r ;i >e (d) i < r ; i < e36. The following events explain binary fission in amoeba.

(i) division of nucleus is followed by the division of cytoplasm.(ii) body of amoeba elongates(iii) parent amoeba divides into two daughter cells.(iv) nucleus also elongates and becomes thinner in the middle.The correct sequence of events is :

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

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(i)

(ii)

(iii)

(iv)

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

37. The given slides A and B were identified by four students I, II, III and IV as stated below.

A BSlide A Slide B

I Binary fission in Amoeba Daughter cells of AmoebaII Budding in yeast Buds of yeastIII Binary fission in Amoeba Buds of yeastIV Budding in yeast daughter cells in Amoebaof the above mentioned identifications of slides A and B which one is correct ?(a) I (b) II (c) III (d) IV

A B I, II, III IV

A B

A B

I

II

III

IV

A B

(a) I (b) II (c) III (d) IV38. Four students A, B, C and D observed a slide of budding in yeast under a microscope.

Following diagrams were drawn by them, after observing the slide.

The correct diagram is drawn by student/s :(a) A only (b) B only (c) C only (d) A and D

A, B, C D

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

39. Study the following sketches made by some students

The sketch illustrating budding in yeast correctly is(a) A (b) B (c) C (d) D

(a) A (b) B (c) C (d) D40. While performing an experiment with raisins, a student recorded the following data :

Mass of water taken in a beaker 50 gMass of raisins before soaking 20 gMass of raisins after soaking 30 gMass of water left after experiment 40 gThe percentage of water absorbed by raisins is :

(a) 50 40 g

10050 g

(b)

50 40 g100

40 g

(c) 30 20 g

10030 g

(d)

30 20 g100

20 g

50 g

20 g

30 g

40 g

(a) 50 40 g 10050 g (b) 50 40 g 100

40 g

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(c) 30 20 g

10030 g

(d)

30 20 g100

20 g

41. In order to remove extra water left on the surface of soaked raisins which one would you preferto wipe off the raisins ?(a) dry cotton cloth (b) dry cotton wool(c) filter paper (d) dry nylon cloth

(a) (b)

(c) (d)

- o O o -