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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

67020

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SECTION-A /

1. Name the elements present in ethanol.

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

3. Name the functional unit of the environment comprising of the living and non-livingcomponent.

4. (a) What percentage of energy available at the producer level is transferred at successivetrophic level in a food chain ?

(b) What percentage of the solar energy is trapped and utilised by the plants ?

(a)

(b)

5. The elements of the third period of the periodic table are given as below :

Group 1 2 13 14 15 16 17 18

Period 3 Na Mg Al Si P S Cl Ar

(i) Out of the above, name the element which separates metals from

non-metals. Mention the name by which such elements are known as ?

(ii) How does the tendency to gain electrons change from Group 1 to

Group 17 ? Give reason for your answer.

1 2 13 14 15 16 17 18

3 Na Mg Al Si P S Cl Ar

(i)

(ii) 1 17

6. State Modern Periodic Law. An element 'X' is in second period and group 16 of the periodic

table. Is it metal or non metal ? Give reason for your answer.

'X' 16

7. Write two advantages of vegetative propagation. List two plants in which vegetative

propagation is practised for agricultural purposes.

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8. State one function each performed by the following organs in human beings :

(a) Testes (b) Prostate gland

(a) (b)

9. The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively.Find the refractive index of glass with respect to water.

3/2 4/3

10. Name the four parts labelled as 1, 2, 3 and 4 in the given diagram.

1, 2, 3 4

11. Draw ray diagram to show the formation of rainbow. State the main cause of its formation.

12. (i) Name any two poisonous products formed by burning of fossil fuels.

(ii) Mention the estimated period upto which Petroleum and Coal reservoirs are expectedrespectively to last.

(i)

(ii)

13. (i) Industrialists are referred to as one of the stakeholders for conservation of forests.Give reasons.

(ii) Mention the name of movement which arose due to conflict of interest between localpeople in forests and industrialists.

(i)

(ii)

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14. (a) How does the supply of air affect combustion of saturated hydrocarbons ?(b) What is indicated by :

(i) sooty flame(ii) blue flame of a bunsen burner.

(c) Why are holes provided at the bottom of a bunsen burner ?(a)

(b)

(i)

(ii)

(c)

15. The atomic number of nitrogen (N), Oxygen (O) and Fluorine (F) are 7, 8 and 9 respectively.

(i) What is the number of valency electrons in N and F ?

(ii) Name the element having smallest and largest atomic radii of any of the above threeelements. Give reason for your answer.

(N), (O) (F) 7, 8, 9

(i) N F

(ii)

16. State the changes that take place in the uterus subsequent to implantation of embryo ? How

does this embryo get nourishment inside the mothers body ?

17. How is the sex of a newborn determined genetically in human beings ? Explain with the helpof a suitable diagram.

18. The traits acquired during the lifetime of an individual are not inherited. Give reason andjustify this statement giving two examples.

19. Define the terms (i) Natural Selection and (ii) Genetic Drift. How do they change thefrequency of certain genes over generations in a population ?

(i) (ii)

20. (a) Differentiate between reflection and refraction.

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(b) State two laws of refraction.

(a)

(b)

21. (a) A concave lens is called a diverging lens. Explain this property with the help ofdiagram.

(b) A concave lens has focal length of 15 cm. At what distance should the object from thelens be placed so that it forms an image at 10 cm from the lens ? Also, find themagnification produced by the lens.

(a)

(b) 15 cm 10

cm

22. (a) Why do stars twinkle ? Explain.

(b) The sky appears dark to astronauts. Why ?

(a)(b)

23. (i) Define functional group in a carbon compound. Identify the functional group present

in CH3Cl, C2H5OH, HCOOH and CH3CH2CH2CHO

(ii) Write the chemical equation for the reaction between methane and chlorine. Mention

the essential condition for this reaction to take place. Why this reaction considered a

substitution reaction ?

(i)

CH3Cl, C2H5OH, HCOOH and CH3CH2CH2CHO

(ii)

OR/

(i) Write names of following carbon compounds(a) CH3CH2CH2 OH

(b) CH3 CO CH2 CH3

(ii) With the help of balanced chemical equations explain. What happens when ethanol isheated with(a) alkaline solution of potassium permanganate,(b) excess concentrated sulphuric acid at 443 K. Write the names of the products

obtained.(iii) Differentiate between saturated and unsaturated hydrocarbons. Why are ethene

(C2H4) and ethyne (C2H2) unsaturated hydrocarbons ? Write their structural

formulae.

(i)

(a) CH3CH2CH2 OH

(b) CH3 CO CH2 CH3

(ii)

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(a)

(b) 443 K

(iii) (C2H4) (C2H2)

24. Name any four modes of reproduction used by single organisms.

With the help of a neat diagram explain the process of regeneration in Planaria. More

complex organisms cannot give rise to new individuals through regeneration. Why ?

OR/

Distinguish between pollination and fertilisation. Explain why, pollination may occur

without fertilization but fertilisation will not take place without pollination.

Draw a neat diagram showing the process of pollination and fertilisation in a flowering plant

and label the following on it.

(i) Female germ cell (ii) Male germ cell

(iii) Ovary (iv) Pollen tube

(i) (ii)

(iii) (iv)

25. (a) Draw a ray diagram for showing the convergence property of a concave mirror. Alsolabel pole, centre of curvature in it.

(b) An object 4.0 cm in size is placed at 25.0 cm in front of a concave mirror of focal length15.0 cm. At what distance from the mirror should a screen be placed in order toobtain a sharp image ? Find nature and size of image.

(c) List any two uses of concave mirror.(a)

(b) 4.0 cm 15.0 cm 25.0 cm

(c)

OR/

(a) Draw a ray diagram in each of the following cases to show the position and nature ofthe image formed when the object is placed :(i) Between optical centre and principal focus (F) of a convex lens.

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(ii) at 2F of a convex lens(iii) at 2F of a concave lens

(b) A convex mirror used for rear view on an automobile has a radius of curvature of3.00 m. If a bus is located at a distance of 5.0 m from this mirror find the position,nature and relative size of the image.

(a)

(i)

(ii) 2F

(iii) 2F

(b) 3.00 m

5.0 m

SECTION - B /

26. Radhika added an iron nail in Copper Sulphate solution taken in a test tube. She observedthat the reddish brown coating formed on the nail is :(a) smooth and shining (b) rough and granular(c) hard and flaky (d) soft and dull

(a) (b)

(c) (d)

27. The colour of zinc sulphate solution is :

(a) Green (b) Yellow (c) Blue (d) Colourless

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

28. After studying the properties of acetic acid in laboratory, four students noted in their copythat acetic acidA : tuns blue litmus redB : tuns red litmus blueC : smells like vinegarD : is insoluble in water

The correct observation is made by student (s) (a) A, C, D (b) only A (c) A and D (d) A and C

A : B :

C : D :

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

29. When sodium bicarbonate solution is added to dilute ethanoic acid, a gas evolves. Whichone of the following statements is not true for this gas ?(a) It turns lime water milky

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(b) It turns acidified potassium dichromate solution green.(c) It extinguishes a burning splinter(d) It is colourless and odourless gas.

(a)

(b)

(c)

(d)

30. Amit mixed 10 ml of acetic acid with 10 ml of water taken in a test tube. He shaked it andafter some time observed that(i) a white precipitate is settled at the bottom.(ii) a clear transparent solution was formed.(iii) a solution with a layer clearly separating water and acetic acid was obtained in which

acetic acid was at bottom with water above it.(iv) a solution with a layer clearly separating water and acetic acid was obtained in which

water is at bottom with acetic acid above it.The correct observation will be(a) i (b) ii (c) iii (iv) iv

10 ml 10ml

(i)

(ii)

(iii)

(iv)

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

31. A student mounts a spherical mirror on a mirror stand and place the stand along a metrescale at 10 cm mark. In front of spherical mirror he mounts a white screen and moves it backand forth along the meter scale, till a highly sharp, well defined image of a distance building

is formed on the screen, now at 25.5 cm mark of the metre scale. What is the focal length ofthe mirror ?(a) 10 cm (b) 22.5 cm (c) 17.25 cm (d) 15.5 cm

10 cm

25.5 cm

(a) 10 cm (b) 22.5 cm (c) 17.25 cm (d) 15.5 cm

32. The following steps are to be followed while measuring the focal length of a lens.(i) Measure the distance between the lens and the screen

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(ii) Adjust the position of the lens to form a sharp image(iii) Select a suitable distant object.(iv) Hold the lens between the object and the screen.Which one of them is the correct sequence for the same ?(a) (iii), (i), (iv), (ii) (b) (iii), (i), (ii), (iv)(c) (iii), (iv), (ii), (i) (d) (i), (ii), (iii), (iv)

(i)

(ii)

(iii)

(iv)

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

33. In order to determine the focal length of a concave mirror by obtaining the image of distantobject on screen, the position of screen should be :(a) parallel to plane of concave mirror.(b) perpendicular to plane of concave mirror(c) inclined at an angle 60 to plane of mirror(d) in any direction with respect to the plane of concave mirror.

(a)

(b)(c) 60

(d)

34. A student suggested the following guidelines to his friend for the experiment on tracingthe path of a ray of light passing through a glass slab :(A) Draw the outline of the glass slab at three positions on the drawing sheet.(B) Draw normals on the top side of these outlines near their left end.(C) Draw the incident rays on the three outlines in directions making angles of 30, 45

and 60 with the normals drawn.(D) Fix two pins vertically on each of these incident rays at two points nearly 1 cm apart.(E) Look for the images of the heads of these pins while fixing two pins from the other

side to get the refracted rays.When these guidelines were shown to his teacher, the only two that were leftuncorrected were the guidelines labelled as :

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

(A)(B)

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(C) 30, 45 60

(D) 1 cm

(E)

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

35. While tracing the path of a ray of light through a rectangular glass slab, the set up in whicha student is likely to get the best result is shown in the Fig :

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

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

36. Binary fission in amoeba begins with :(a) division of nucleus (b) formation of bud(c) division of cytoplasm (d) fusion of two nuclei

(a) (b)

(c) (d)

37.The figures given below show the sequence of :

(a) formation of germ cells in amoeba(b) formation of bud in amoeba(c) formation of similar gametes in amoeba(d) formation of daughter cells in amoeba

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(a)

(b)

(c)

(d)

38. Out of the followings, which diagram show budding in yeast.

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

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

39. After showing the slide of budding of yeast, the teacher asked her students to identify thetype of organism to which yeast belonged ?(i) Algae (ii) Fungi (iii) unicellular Protozoa (iv) Bacteria(a) i (b) ii (c) iii (d) iv

(i) (ii) (iii) (iv)

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

40. To determine the percentage of water absorption by raisins, the apparatus which is notrequired is(a) Weight box (b) Forceps(c) blotting paper (d) slide

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(a) (b)

(c) (d)

41. If weight of dry raisins W1 gmweight of swollen raisins W2gmweight of water absorbed by raisins W gmThen percentage of water absorbed by raisins would be

(a) 1W

100W (b) 2

1

W100

W W

(c)1

W100

W (d) 2

1

W100

W

W1 g

W2 g

W g

(a) 1W

100W (b) 2

1

W100

W W

(c)1

W100

W (d) 2

1

W100

W

- o 0 o -