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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

67032

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SECTION-A /

1. Which of the following belong to the same homologous series ?C3H8 , C4H8 , C4H6 , C3H6

C3H8 , C4H8 , C4H6 , C3H6

2. On which factor does the colour of the scattered white light depend ?

3. Choose one consumer each that belongs to the second and third trophic levels from theorganisms given below.Eagle, frog, tiger , rabbit, fox

4. Pesticides added to a field is seen in increased amounts in the crop and in the birds that feed onthem. What is this phenomenon called ?

5. (a) State modern periodic law.(b) Mention the position of the following in the periodic table :

(i) Isotopes of an element(ii) Hydrogen

(a)

(b)

(i)

(ii)

6. The atomic number of three elements A,B and C are 11, 14 and 17 respectively.(a) State the group to which these elements belong in the modern periodic table.(b) Write the formula of the compound formed when the element B reacts with C.

A, B C 11, 14 17

(a)

(b) B C

7. Differentiate between self pollination and cross pollination.

8. Mention the specific plant part where formation of seeds occur. Briefly describe various partsof seed.

9. (a) Suggest one point of a lens through which a light ray passes undeviated.(b) The power of a lens is 4D. Analyse this value and state any two characteristics of the

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image formed by the lens.

(a)

(b) 4D

10. Why do stars twinkle ? Explain with the help of diagram.

11. (a) Define distance of distinct vision and give its range.

(b) What is the role of iris in a human eye ?

(a)

(b)

12. List four disadvantages of burning fossil fuels ?

13. List four stakeholders of forests.

14. (a) Draw electron dot structure for oxygen molecule.(b) Mention the cause of hardness of water.(c) Mention the name and the formula of second member of homologous series of alkanes.

(a)

(b)(c)

15. Two elements X and Y belong to groups 1 and 3 respectively in the same period, compare thesewith respect to their :(a) metallic character(b) size of the atoms(c) formulae of their oxides and chlorides.

X Y 1 3

(a)

(b)

(c)

16. What is Placenta in human female ? Explain its structure and functions.

17. Explain in brief the factors that can lead to the rise of new species.

18. Explain with the help of diagram how sex of a child is determined at the time of conception inhuman beings.

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19. What are homologous organs? How do they provide evidence in support of evolution?

20. (a) An object 1 cm high produces a real image 1.5 cm high when placed at a distance of 15cm from a concave mirror. Calculate the position of the image and the magnification.

(b) Write two uses of concave mirrors.(a) 1 cm 15 cm 1.5 cm

(b)

21. (a) A ray of light travelling from a medium X enters obliquely into another medium Y. If itbends away from the normal then state which one of the two is relatively opticallydenser. Why ?

(b) Light enter from air to diamond having refractive index 2.42. Find the speed of light in

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

(a) X Y

Y

(b) 2.42 3108

m/s

22. What is hypermetropia ? Draw ray diagrams to show the image formation of an object by :

(i) Hypermetropic eye,

(ii) Correction made with a suitable lens for hypermetropic eye.

(i)

(ii)

23. (a) Complete the following equation and answer the questions given

2 2 2CH CH HNickel

(i) Write the structural formula for the product of the above reaction.(ii) Mention the use of Nickel in the reaction.

(b) Mention any one property of covalent compounds.(c) Name the following compounds.

(i) CH3

CH2

Br (ii) HCOOH(a)

2 2 2CH CH HNickel

(i)

(ii)

(b)

(c)

(i) CH3CH2Br (ii) HCOOH

OR/

(a) Define Substitution reaction shown by hydrocarbons.(b) Write the chemical reaction for the Substitution of hydrogen in methane by

chlorine.

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(c) Which out of the following hydrocarbons is more reactive and why ?

C2H6 or C2H4

(d) Name the functional group present in Propanone.

(a)

(b)

(c)C2H6 C2H4

(d)

24. (a) What are contraceptives ? Why are they needed ?(b) Draw a neat diagram of human female reproductive system and label its four important

parts.

(a)

(b)

OR/

(a) How are oral pills effective against unwanted pregnancy ?(b) Draw a neat diagram showing germination of pollen on stigma with Labellings of

stigma, Pollen tube, male germ cell and ovary.

(a)

(b)

25. (a) Draw a ray diagram to show the principal focus of a convex mirror.(b) How will you decide whether a given piece of glass is a convex lens, a concave lens or a

glass plate if you are provided with a book only ?(c) Draw a ray diagram to show the formation of image when an object is placed betweenfocus and pole of a concave mirror. State the nature, relative size and position of theimage formed.

(a)

(b)

(c)

OR/

(a) Magnification produced by a concave mirror is 4. Find the position of the object if thefocal length of the mirror is 50 cm.

(b) Draw a ray diagram to show the formation of image when object is placed in front of aconcave lens. Write the nature, position and the relative size of the image formed.What happens to the size of the image when object is moved closer to the lens ?

(a) 4 50 cm

(b)

SECTION B/

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26. A student added aluminium, copper, zinc and iron pieces to copper sulphate solution taken infour different test tubes. A, B, C and D as shown in the following table

Test tube A Aluminium + Copper sulphate solution

Test tube B Zinc + copper sulphate solution

Test tube C Copper + copper sulphate solution

Test tube D Iron + copper sulphate solutionThe test tube in which no change in colour was observed is(a) A (b) B (c) C (d) D

A, B, C D

A +

B +

C +

D +

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

27. The correct observation of the experiment conducted by a student in which he reacted iron with

copper sulphate solution is reported at the serial number.

S.No. Initial colour of the solution Final colour of the solution

A Blue Colourless

B Blue Pale green

C Pale green Blue

D Blue Blue

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

A

B

C

D

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

28. Acetic acid is ---

(a) Soluble only in boiling water

(b) Soluble in water at room temperature

(c) Partially soluble in water

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(d) insoluble in water

(a) (b)

(c) (d)

29. The odour of acetic acid resembles that of

(a) rose (b) burning plastic

(c) vinegar (d) kerosene

(a) (b)

(c) (d)

30. 5 mL of acetic acid was added to 5mL of water and the mixture was shaken well for one

minute. It was observed that :

(a) turbidity appeared in the test tube

(b) acid formed a separate layer at the bottom.

(c) water formed a separate layer at the bottom.

(d) a clear solution was formed

5 mL 5 mL

(a)

(b)

(c)

(d)

31. What is the focal length of the given concave mirror ?

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(a) 11.0 (b) 10.5 (c) 10.4 (d) 10.1

(a) 11.0 (b) 10.5 (c) 10.4 (d) 10.1

32. A student has to do the experiment on finding the focal length of a given convex lens by using adistant object. She can do her experiment if she is also made available(a) a lamp and a screen (b) a scale and a screen

(c) a lamp and a scale (d) only a screen

(a) (b)

(c) (d)

33. A student obtained a blurred image of a distant light house on a screen using a concave mirror.In order to make it sharp (clear), he will have to shift the(a) mirror towards the screen(b) mirror away from the screen

(c) mirror towards or away from the screen depending upon the situation(d) mirror and screen both towards the light house

(a)

(b)

(c)

(d)

34. Four students have shown the path of a ray of light through rectangular glass slab as___

Correct path has been drawn by ___(a) A (b) B (c) C (d) D

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

35. Ritesh performed the experiment to trace the path of a ray of light through a glass slab and

measured angles of incidence (i) refraction (r) and emergence (e) In different sets of

observations, she noticed following relationship between

i,

r, and

e___

(i) ir ; r r ; r >e (iv) ie ; i > r.Correct relationship is (a) (i) (b) (ii) (c) (iii) (d) (iv)

(i),

(r) (e) i, r e

(i) ir r r r > e (iv) ie i > r.

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

36. From the following diagrams, select the correct sequence showing stages of binary fission in

amoeba.

(a) 3, 4, 2, 1 (b) 2, 4, 3, 1 (c) 2, 3, 4, 1 (d) 1, 3, 2, 4

(a) 3, 4, 2, 1 (b) 2, 4, 3, 1 (c) 2, 3, 4, 1 (d) 1, 3, 2, 4

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

below :

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Slide A Slide B

(I) Binary fission in Amoeba Daughter cells of Amoeba

(II) Budding in yeast Buds of yeast

(III) Binary fission in Amoeba Buds of yeast

(IV) Budding in yeast Daughter cells in Amoeba

The correct identification has been made by the student :

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

A B I, II, III, IV

Slide A Slide B

(I)

(II)

(III)

(IV)

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

38. In figures given below two are showing process of buddingThese are

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

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

39. Which of the following does not show budding ?

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

?

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

40. Different steps in the experiment, to determine the percentage of water absorbed by raisins,are given below which may not be in proper sequence.

(1) Soak raisins for about an hour

(2) Weigh dry raisins

(3) Weigh soaked raisins

(4) Gently dry the raisins with the help of filter paper

The correct sequence of the steps is :

(a) 1, 2, 4, 3 (b) 2, 1, 4, 3 (c) 4, 3, 1, 2 (d) 4, 2, 1, 3

(1) 1

(2)

(3)

(4)

(a) 1, 2, 4, 3 (b) 2, 1, 4, 3 (c) 4, 3, 1, 2 (d) 4, 2, 1, 3

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41. While performing an experiment with raisins, a student recorded the following data.

Mass of water taken in the beaker 50 g

Mass of raisins before soaking 20 g

Mass of raisins after soaking 30 g

Mass of water left in the beaker after soaking 40 g

The percentage of water absorbed by the raisins is :

(a) 50 30 g

10050 g

(b)

50 40 g100

50 g

(c) 30 20 g

10030 g

(d)

30 20 g100

20 g

50 g

20 g

30 g

40 g

(a) 50 30 g

10050 g

(b)

50 40 g100

50 g

(c) 30 20 g

10030 g

(d)

30 20 g100

20 g

- o O o -