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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 of

Central 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 other

material 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 action

criminal 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 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 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

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SECTION-A /

1. Write the names of alkenes having two and three carbon atoms respectively.

2. State the nature of the image formed at the retina of human eye.

3. What is meant by DNA copying? Mention its importance in reproduction?

DNA

4. Write two advantages of vegetative propagation?

5. An element „X‟ placed in 2nd group and 3rd period of the modern periodic table, burns in air to

form a basic oxide. Identify whether the element is a metal or non metal and write its atomic

number and configuration. Justify your answer.

„X‟ 2 3

6. “There is an anomaly when it comes to the position of hydrogen in the modern periodic table”.

State any two reasons.

7. State any two differences between binary fission and multiple fission.

8. More complex organisms can not give rise to new individuals through regeneration. Why ?

9. What is meant by radius of curvature of a spherical mirror? How is it related to the focal length of

the mirror ?

10. (a) What is the near point of the human eye with normal vision ?

(b) Why is a normal eye not able to see clearly the objects placed closer than the near point ?

(a) (b)

11. The sun appears oval (or flattened) at sunrise and sunset, but appears circular at noon. Explain,

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why ?

12. Why do we need to build large dams ? List four reasons.

13. “Burning fossil fuels is a cause of (i) acid rains and (ii) global warming”. Justify this statement.

(i) (ii)

14. (a) Why are detergents considered more useful than soaps these days ? State one reason only.

(b) Draw electron dot structure for Oxygen molecule. (c) Select alkanes from the following : C2H4 , C5H12 , C4H8, C3H8

(a)

(b)

(c)

C2H4 , C5H12 , C4H8, C3H8

15. How are elements arranged in the Modern Periodic Table ? State the position of

(i) Metals (ii) Non–metals

(iii) Noble gases and (iv) Metalloids

in the Modern Periodic Table.

(i) (ii)

(iii) (iv)

16. State the reasons for adopting contraceptive methods. List four methods of contraception.

17. In a cross between plants with purple flowers and plants with white flowers the offsprings of F1

generation all had white flowers. When the F1 generation was self – crossed, it was observed in

the F2 generation that out of 100, 75 flowers were white. Make a cross and answer the following :-

(a) What are the genotypes of the F2 progeny ?

(b) What is the ratio of White : Purple flowers in the F2 generation ?

F1

F1 F2 100 75

(a) F2

(b) F2

18. (a) Explain Geographical isolation.

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(b) Giving reasons state whether the following are Homologous or Analogous organs :-

(i) Wings of butterfly and wings of a bat

(ii) forelimbs of frog and human

(a)

(b)

(i)

(ii)

19. Look at the given picture and write its name. Also give its significance in the study of evolution

of organisms.

20. An image 2/3rd the size the object is formed by a convex lens at a distance of 12cm from it. Find the focal length of the lens.

12cm 2/3

21. Draw ray diagram and describe the nature of the image formed by a concave mirror when the

object kept__________ (a) between pole and focus of the mirror (b) Between infinity and centre of curvature of the mirror

(a)

(b)

22. A student has difficulty in reading the black board while sitting in the last row What could be the

defect the student is suffering from ? How can it be corrected ? Draw the ray diagrams for (a) defective eye (b) its correction.

(a) (b)

23. (a) Name the following compounds (i) CH3-CH2-CH3 (ii) CH3CHO (b) (i) Complete the following equation

CH3CH2OH + O2 -- (ii) Name the above reaction (c) Draw the structure for Benzene.

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(a) (i) CH3-CH2-CH3 (ii) CH3CHO

(b) (i)

CH3CH2OH + O 2 --

(ii)

(c)

OR/

(a) How can an ester be prepared in laboratory ? Write the chemical reaction involved in its preparation. (b) Ethanoic acid is also known as glacial acetic acid. Why ? (c) List two differences between saturated and unsaturated hydrocarbons.

(a)

(b)

(c)

24. Draw a neat diagram of longitudinal section of a flower showing growth of pollen tube and label

on it the following : (i) ovary (ii) style (iii) stigma State in brief the functions of these parts.

(i) (ii) (iii)

OR/

(a) Name the parts of flower which contain germ cells. (b) What is the difference between self pollination and cross pollination ? (c) Testes are located outside the abdominal cavity. Why ? (d) Fertilization is possible if copulation has taken place during middle of menstrual cycle.

Give reason. (e) What happens when the egg is not fertilized ?

(a)

(b)

(c)

(d)

(e)

25. (a) Define power of a lens.

(b) An object is kept at a distance of 18cm, 20cm, 22cm, and 30cm, from a lens of power +5D.

(i) In which case or cases would you get a magnified image?

(ii) Which of the magnified image can be got on a screen?

(c) List two widely used applications of a convex lens.

(a)

(b) +5D 18cm 20cm, 22cm, 30cm

(i) / /

(ii)

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(c)

OR/

(a) A very thin narrow beam of white light is made incident on three glass objects shown below. Comment on the nature of behaviour of the emergent beam in all the 3 cases.

(b) There is a similarity between two of the emergent beams. Identify the two. (c) When light enters from air to glass the angles of incidence and refraction in air and glass are 45and 30 respectively. Find the refractive index of glass.

(Given that sin 45 =1

2; sin 30=1/2)

(a)

(b)

(c) 45 30

sin 45 =1

2 ; sin 30=½)

SECTION - B /

26. A piece of granulated Zn was dropped into CuSO4 solution. After some time, the colour of the solution changed from : (a) light green to blue. (b) blue to colourless. (c) light green to colourless. (d) blue to light green.

Zn CuSO4

(a) (b)

(c) (d)

27. Which of the following solutions is of blue colour –

(a) Solution of copper sulphate (b) Solution of ferrous sulphate (c) Solution of Zinc sulphate (d) Solution of aluminium sulphate

(a) (b)

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(c) (d)

28. A student added acetic acid to four test tubes A, B, C and D containing NaCl, NaOH, Na2CO3 and

NaHCO3 respectively. He would observe brisk effervescence in the test tubes :

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

A, B, C D NaCl, NaOH, Na2CO3 NaHCO3

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

29. 5 mL each of acetic acid and water are mixed together in a test tube. On shaking the mixture it is

found that the diagram depicting the correct observation is :

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

5 mL 5mL


30. When sodium hydrogen carbonate powder is added to acetic acid, a gas evolves. Which one of

the following statements is not true for this gas ? It : (a) turns lime water milky. (b) extinguishes a burning splinter. (c) turns red litmus blue. (d) is a colourless and odourless gas.

(a)

(b)

(c)

(d)

31. To Find focal length of a convex lens in laboratory, Manoj fixed it on a stand and kept it on a mark

of 15.3 cm an optical bench. To get a clear image of a distant tree, he adjusted a screen and finally got clear image when screen was placed at 32.5 cm. Focal length of the lens is :

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(a) 32.5 cm (b) 17.2 cm (c) 34.4 cm (d) 47.8 cm

15.3

32.5 cm

(a) 32.5 cm (b) 17.2 cm (c) 34.4 cm (d) 47.8 cm

32. A teacher held a pencil close to a spherical mirror and asked four students A, B, C, D to identify the nature with the help of image that formed in the mirror. It was erect and enlarged. The students identified it the mirror as : (a) convex in nature. (b) concave in nature. (c) plane mirror (d) plane at the center and concave from edges correct identification was done by (a) A (b) B (c) C (d) D

A, B, C, D

(a)

(b)

(c)

(d)

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

33. While trying to identify convex lens from a group of glass pieces lying on a table, Asha found that there is lens that always forms a virtual and diminished image. The kind of this lens is : (a) plano convex lens (b) double concave lens (c) double convex lens (d) plane glass sheet

(a)

(b)

(c)

(d)

34. In an experiment to trace the path of a ray of light passing through a rectangular glass slab, the

correct measurement of angle of incidence (i), a angle of refraction (r) and angle of emergence (e) is shown in diagram

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

(i), (r) (e)

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

35. While performing the experiment on tracing a ray of light passing through a rectangular glass

slab, the inference given by four students after measuring angles of incidence, refraction and

emergence is as __________ .

(a) angle of refraction is greater than angle of emergence

(b) angle of refraction is equal to angle of emergence

(c) angle of incidence is greater than angle of emergence

(d) angle of incidence is equal to angle of emergence

Which student has given correct inference ?

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

(a)

(b)

(c)

(d)

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

36. Which of the following represent binary fission in amoeba :

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

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

37. After students had observed the slide of binary fission of amoeba, a teacher asked her students

why this process was called binary fission. Out of the four statements given by different students, which one is the correct one ? (a) One parent cell divides into two daughter cells. (b) Two daughter cells combine to form one new cell. (c) One parent and one daughter cell are involved in the process. (d) Two parent cells combine to form daughter cells.

(a)

(b)

(c)

(d)

38. Which one of the following does not represent budding in yeast

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

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

39. Out of the given diagrams, the correctly labelled diagram showing budding in yeast is :

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40. Students A, B and C were given five raisins of equal weight. The raisins were soaked in distilled

water at room temperature. A removed raisins after 20 minutes, B after two hours and C after 40 minutes. If PA, PB and PC denote percentage absorption of water, obtained by students A, B and C respectively, then : (a) PA > PB > PC (b) PA < PB < PC (c) PA < PB > PC (d) PA > PB < PC

तीन छात्र A, B, C को बराबर भार के पाँच ककशममश किये । उन्हहंने इनको कमरे के ताप पर आसतु जऱ मं मभगोया । A ने ककशममशं 20 ममनट मं मनकाऱ मऱया , B ने 2 घटे

बाि और C ने 40 ममनट बाि मनकाऱा । यकि PA, PB and PC . A, B, C के द्वारा पररकमऱत क्रमश: अवशोषषत जऱ की प्रमतशत मात्रा हो तो –

(a) PA > PB > PC (b) PA < PB < PC (c) PA < PB > PC (d) PA > PB < PC

41. If „X‟ represents weight of soaked raisins and „Y‟ represents weight of dry raisins then

( ) 100

x y

y

is a way to calculate percentage of

(a) water absorbed by raisins in hypertonic solution. (b) water absorbed by raisins in hypotonic solution. (c) water lost by raisins in hypotonic solution. (d) water lost by raisins in hypertonic solution.

यकि ’X’ भीगे ककशममशं का भार और ’Y‟ शषु्क ककशममशं का भार हो तो ( )

100x y

y

से पररकमऱत कर सकते हं –

(a) ककशममशं के द्वारा अमतपरासरणिाबी षवऱयन मं अवशोषषत जऱ की प्रमतशत मात्रा । (b) ककशममशं के द्वारा अल्पपरासरणिाबी षवऱयन मं अवशोषषत जऱ की प्रमतशत मात्रा । (c) ककशममशं के द्वारा अमतपरासरणिाबी षवऱयन मं खोये जऱ की प्रमतशत मात्रा। (d) ककशममशं के द्वारा अल्पपरासरणिाबी षवऱयन मं खोये जऱ की प्रमतशत मात्रा ।

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