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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 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, 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

67001

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SECTION-A /

1. Write the two succeeding members of the following homologous series : C2H6, C3H8.

C2

H6

, C3

H8

2. State the colour of sunlight scattered by air molecules in the atmosphere.

3. Write any two effects of Ozone depletion on our health.

4. Write the appropriate names of the trophic levels Z and X in the figure given below :

Z X

5.State modern periodic table law. What is the number of total periods andgroups in periodic table.

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6. How does the atomic radii of elements change in periodic table :

(a) down the group

(b) across the period from left to right

:

(a) () (b) ()

7. Explain with example the importance of variation in the species.

8. How is the process of binary fission in Amoeba different to that in Leishmania ?

9. List four characteristics of images formed by plane mirrors.

10. What is dispersion ? What happens when light is passed through a glass prism.

11. What is meant by near point and far point of an eye ? State their values for the normal humaneye.

12. Why must we conserve our forests ? List any two causes for deforestation to take place.

13. Define water harvesting. List two traditional systems of water harvesting.

14. Explain why it is difficult to wash clothes with soap when water is hard. How do detergents

help in overcoming this problem ?

15. Part of the periodic table is given below where atomic numbers of elements aregiven in the parenthesis.

Li (3) Be (4)

Na (11) Mg (12)

K (19) Ca (20)

Rb (37) Sr (38)(i) Give the electronic configuration of K.

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(ii) Predict the number of valance electrons in the atom of Ca.

(iii) What is the number of shells in the atom of Na ?

(iv) Arrange Be, Mg, Ca, Sr in the increasing order of the size of theirrespective atoms.

(v) Predict whether Rb is a metal or non metal.

(vi) Out of Na, Li, Be and Mg which one has biggest atom in size ?--

Li (3) Be (4)

Na (11) Mg (12)

K (19) Ca (20)

Rb (37) Sr (38)

(i) K

(ii) Ca ?

(iii) Na ?(iv) Be, Mg, Ca, Sr :

(v) Rb ?

(vi) Na, Li, BeMg ?

16. (a) Draw a neat labelled diagram of a germinated seed and label radicle, plumule and

cotyledon .

(b) Mention function of each of these parts.

(a)

(b)

17. Name the organism Mendel used for his experiment. Explain about F1 and F2 progeny obtainedby Mendel when he cross-bred the tall and the short varieties of the organism he experimentedwith.

F1 F2

18. What is meant by analogous organs and homologous organs ? Identify the analogous and

homologous organs amongst the following :

Wings of a butterfly, wings of a bat, forelimbs of frog, forelimbs of a human.

19. How is sex of a new born determined genetically in human beings ?

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20. State the reason of using convex mirrors as rear-view mirrors. A convex mirror used on anautomobile has a focal length of 3 m. If a car behind is at a distance of 5 m, find the location ofimage of the car in the mirror.

3 m 5 m

21. Define power of a lens and state its SI unit. Which type of lens has a negative power ? Findthe power of a lens of focal length20 cm.

SI

20 cm

22. A person cannot see nearby objects clearly. State the defect of vision he is suffering from.

Draw ray diagrams to show the defect and correction. Name the lens used for correction.

23. (i) Explain the two characteristic features that are seen only in carbon and not in any other

element, to form a large number of compounds.

(ii) Write the names of the next homologue of CH3

CH2

OH and HCOOH.

(i)

(ii) CH3CH2OH HCOOH

ORA compound Xis used in cough syrups and many tonics. It is also soluble in water in all

proportions..

(i) Name the compound X. Write its chemical formula.

(ii) Which gas is evolved when the compound X reacts with sodium ? How will you testthe presence of this gas ? Write the chemical equation involved in reaction of X with

sodium.

(iii) Complete the following equation for X and Identify Y.

X4Alkaline kMnO

Heat YX

(i) X

(ii) X

X

(iii) X Y

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4'X' 'Y'KMnO

24. (a) Specify the location of human testis in male reproductive system and write the

advantage of it being present over there.

(b) Mention two roles of testis in reproductory system.(c) Write two glands found in male reproductive pathway and specify their roles.

(a)

(b)

(c)

OR/

(a) Draw a neat diagram of human female reproductive system and label

(i) Oviduct (ii) Ovary (iii) Uterus (iv) Cervix

(b) Mention the function of Uterus and Oviduct.

(a)

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

(b)

25. A concave lens of focal length 20 cm forms an image 10 cm away from the lens. Use lens

formula to find the position of the object with respect to the lens. Also draw ray diagram to

illustrate the image formed in this case.20 cm 10 cm

OR/

(a) State the laws of refraction of light.

(b) Using the lens formula and sign conventions for refraction by spherical lenses find the

position nature and magnification of the image formed by a convex lens of focal length 20

cm when object is placed at a distance of 18 cm from the lens.

(a)

(b)

20 cm

18 cm

SECTION - B /

26. Four test tubes containing solutions (I), (II), (III) and (IV) are shown below along with their

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colours. Zink sulphate is contained in :

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

(I), (II), (III) (IV)

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

27. The correct observation made by the student after putting clean pieces of iron in the test tubecontaining Zinc Sulphate solution as shown in the diagram :

(a) Solution becomes green and zinc metal gets deposited on iron pieces(b) Solution becomes colourless and zinc metal gets deposited on the iron pieces(c) No reaction is observed(d) Iron pieces start dissolving in the solution making it pale green.

(a)

(b)

(c)

(d)

28. Crystals of CH3COOH, when dissolved in water, will form :

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(a) weak acid. (b) weak base.

(c) strong acid. (d) strong base.

CH3COOH :(a) (b) (c) (d)

29. Neelima was asked to test the solubility of acetic acid. She added a smallamount of its crystals into water taken in a beaker. After some time sheobserved that :

(a) White precipitate was formed at the bottom.

(b) Crystals dissolved completely.

(c) Crystals settled at the bottom.

(d) gas was evolved with effervescence.

:

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

30. During the experiment to study reaction of acetic acid with sodiumbicarbonate, a student passed the evolved gas through lime water in a test

tube. He would observe that :

(a) a yellow precipitate is formed.

(b) no change in colour of lime water takes place.

(c) lime water turns milky.

(d) lime water turns pink.

:

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

31. The focal length of a concave mirror in the experimental set up shown below is equal to :

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(a) 12.2 cm (b) 11.4 cm (c) 11.0 cm (d) 10.8 cm

(a) 12.2 cm (b) 11.4 cm (c) 11.0 cm (d) 10.8 cm

32. While determining focal length of a concave mirror, four students A,B,C,D obtain the image of

a distant tree on a screen and make the following observation :

(A) Image is virtual, erect and small (B) Image is real, erect, small

(C) Image is real, inverted, small (D) Image is virtual, inverted, small

Who has made the correct observation

(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. In the laboratory a student was provided with a convex lens whose focal length wassomewhere between 20 cm to 25 cm. While focusing a distant object to find out its focal

length, he should adjust the position of screen between :

(a) 20 cm and 25 cm marks on scale from lens

(b) 40 cm and 50 cm marks on scale from lens

(c) 25 cm and 30 cm marks on scale from lens

(d) 15 cm and 20 cm marks on scale from lens

20 cm 25 cm

(a) 20 cm 25 cm

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(b) 40 cm 50 cm

(c) 25 cm 30 cm

(d) 15 cm 20 cm

34. While tracing the path of a ray of light through glass slab, a student observes

that -(a) refracted ray bends away from normal while emergent ray is parallel to incident ray.(b) refracted ray is parallel to incident ray while emergent ray bends away from normal.(c) refracted ray bends towards the normal while emergent ray is parallel to incident ray.(d) refracted ray bends towards the normal and emergent ray also bends towards the

normal.

(a)

(b)

(c)

(d)

35. While performing experiment with glass slab, a student observed that when a ray of light, onpassing from one medium to another medium changes its path in the second medium.According to him this is called :

(a) reflection (b) refraction(c) scattering (d) Tyndal Effect

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

36. Binary fission in amoeba begins with -(a) Division of cell (b) Division of cytoplasm(c) formation of bud (d) fusion of two cells

(a) (b)

(c) (d)

37. Binary fission in amoeba is shown below but these figures are not in right sequence.

The correct sequence is -

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

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

38. In the figure of budding in yeast given below, the structures A, B, C and D should be labelledrespectively as :

(a) Nucleus of bud, yeast, nucleus of yeast, bud(b) Nucleus of bud, nucleus of yeast, bud, yeast(c) Nucleus of bud, bud, yeast, nucleus of yeast(d) Nucleus of bud, bud, nucleus of yeast, yeast

A, B, C D

(a)

(b) ,

(c)

(d)

39. Study the following four figures that illustrate reproduction.

The figures that illustrate budding are :(a) I and II (b) I and III (c) I and IV (d) II and IV

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

40. A student noted down following observations :

(i) mass of dry raisins 6.4 g

(ii) mass of soaked raisins 8.0 g

On the basis of these observation he would determine the percentage of waterabsorbed by raisins as :

(a) (b)

(c) (d)

:(i)

6.4 g(ii) 8.0 g

-

(a) (b)

(c) (d)

41. In order to remove extra water left on the surface of soaked raisins the raisins arewiped off gently using.

(a) dry cotton cloth (c) dry cotton wool

(b) dry acrylic wool (d) filter paper

-

(a) (b) (c)

() (d)

8.0 6.4100

6.4

8.0 6.4100

14.4

8.0 6.4100

6.4

8.0 6.4100

8.0

8.0 6.4100

6.4

8.0 6.4100

14.4

8.0 6.4100

6.4

8.0 6.4100

8.0