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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 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

67031

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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. State the role of ciliary muscles in human eye.

3. During heavy rain in a village the rain water carried excessive fertilizers to a pond. How will itaffect the fish population in the pond in the long run ?

4. Name one natural and one man made ecosystem.

5. Mention any two trends exhibited by elements when we go from left to right across the period

of periodic table.

6. Elements in Periodic Table show periodicity of properties List any four such properties.

7. Which parts / organs of the human reproductive systems perform the followingfunctions : -(a) Site of implantation of gamete(b) Entry of sperms in female reproductive system

/

(a)

(b)

8. Give any two suitable differences between Radicle and Plumule.

9. The radius of curvature of concave mirror is 50 cm. Where should an object be placed from themirror so as to form its image at infinity ? Justify your answer.

50 cm

10. Stars appear to twinkle. What could be the two possible reasons for this observation ?

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11. State the phenomenon involved in the formation of a rainbow in the sky. Arrange thesephenomenon in proper sequence.

12. List two disadvantages of building large dams over rivers.

13. Name two fossil fuels. List one product each formed when these are burnt in(a)sufficient oxygen and (b)insufficient oxygen.

(a)

(b)

14. (a) Write a test to distinguish between Ethanol and Ethanoic acid.(b) Draw electron dot structure of ethane.(c) Why do soaps form scum with hard water ?

(a)

(b)

(c)

15. From the part of a periodic table, answer the following questions :

1

Lithium

2 13 14

Carbon

15 16

Oxygen

17

Fluorine

X P QY R

Z T

(a) Which is the most reactive metal ?

(b) Name the family of fluorine Q,R,T.

(c) Name one element each of group 2 and 15.

(d) Give the name of the element P placed below Carbon.

(e) Compare X and P with respect to size of atoms.

1 2 13 14 15 16 17

X P Q

Y R

Z T

(a)

(b) X, Q, R, T

(c) 2 15 2

(d) P (e) X P

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16. (a) Name any two plants that reproduce by Grafting.

(b) List any two benefits to an organism that reproduces through spores ?

(a)

(b)

17. A tall red seeded Plant (TTRR) is crossed to a short white seeded plant (ttrr). Find outphenotypes and genotypes of F

1and F

2generation with a cross.

(TTRR) (ttrr) F1

F2

18. Write three differences between acquired and inherited traits.

19. (a) Define speciation.

(b) What is micro evolution ? Does it explain speciation ?(a)

(b)

20. (a) Name and define the S.I. unit of power of a lens.(b) How is the power of a lens related to its focal length ? Find the power of a concave lens

of focal length 25 cm.

(a) bog H$s j_Vm Ho$ S. I.mH$H$m Zm Ed CgH$s n[a^mfm {b{IE&(b) {H$gr b|g H$s jVm VWm CgH$s $moH$g Xar | m g~Y h?Cg Cmb b|g H$s jVm kmV H$s{OE {OgH$s\$moH$g

Xar25 cm h&

21. (a) State Snells law of refraction.(b) What is the speed of light in a transparent medium which has a refractive index of 1.7

(the speed of light in vacuum is 310 m/s)

(a) Zob H$m AndVZ H$m {Z {b{IE&(b) Cg nmaXeu m | nH$me H$s Mmb kmV H$s{OE {OgH$m AndVZmH$ 1.7 h? ({ZdmV | H$me H$s Mmb

3x10m/s)

22. (a) Draw a ray diagram to represent how a narrow beam of white light after dispersionthrough a prism can be made to recombine as white light.

(b) Name the defects of vision when a person can not see clearly :(i) the nearly objects(ii) the distant objects

(c) A person suffering from a defect of vision uses a corrective lens of power 2D. Findthe nature and focal length of the corrective lens.

(a)

(b)

(i)

(ii)

(c) 2D

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23. (i) (a) Complete the following reaction equation :

CH3 COOH C2H5OHAcid

(b) State the name of this reaction.(ii) What are covalent bonds ? Give any two examples of covalently bonded molecules.

(iii) Draw the structure of Cyclohexane.(i) (a)

CH3 COOH C2H5OH

(b)

(ii)

(iii)

OR/

(i) Define Saponification reaction ?

(ii) Complete the reaction :

CH3 COOC2H5NaOH

(iii) Name any two covalent compounds. Why are they poor conductors of electricity ?

(iv) Write the formula of the functional group present in an aldehyde.

(i)

(ii)

CH3 COOC2H5NaOH

(iii)

(iv)

24. (a) Give reasons :(i) Blocking of Fallopian tubes prevents pregnancy(ii) Testes are located outside the abdomen cavity(iii) Pre-natal sex determination has been banned by law

(b) With the help of suitable diagrams explain how reproduction occurs in Hydra ? Alsoname the process involved.

(a)

(i)

(ii)

(iii)(b)

OR/

(a) Give reasons :-(i) Placenta is extremely essential for foetal development.(ii) Blocking of vas deferens prevents pregnancy.(iii) Copying of DNA is important in the process of reproduction.

(b) With the help of suitable diagrams explain how reproduction occurs in Planaria. Alsoname the process involved.

(a)(i)

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(ii)

(iii) DNA

(b)

25. (a) Two lenses have power of (i) 2D, (ii) 4D. State the nature and focal length of each

lens.(b) A concave lens has focal length of 20 cm. At what distance from the lens a

5cm tall object be placed so that it forms an image at 15cm from the lens ? Also calculatethe size of the image formed.

(a) (i) 2D, (ii) 4D

20 cm 5cm

15cm

OR /

(a) Name the type of mirror used in the following :(i) Headlights of a car.

(ii) Rear view mirror of a vehicle. Support your answer with reason.(b) When an object is placed at a distance of 60cm from a diverging spherical mirror, the

magnification produced is 0.5. Where should the object be placed to get a magnification

of1

3?

(a)

(i)

(ii)

(b) 60cm

0.51

3

SECTION - B /

26. Look at the figures below :

In which test tube (s) a change in the metal pieces will be observed ?(a) I, II, III (b) II, III, IV(c) III only (d) I, only

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

27. A student put an aluminium strip in a beaker containing freshly prepared copper sulphatesolution. Out of the following observation select the one which is Not correct.(a) The solution is light green in the beginning(b) The solution is blue in the beginning(c) There is reddish brown deposit on aluminium metal

(d) The final solution after the reaction is colourless

(a)

(b)

(c)

(d)

28. Four students A, B, C and D observed the chemical properties of acetic acid and recorded their

observations in the table given below. The correct observations were made by :

StudentsEffect on litmus Reaction with NaHCO3

Blue to red Red to blue CO2 gas H2 gas

A X X

B X X

C X X

D X X

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

A, B, C D

NaHCO3

CO2

H2

A X X

B X X

C X X

D X X

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

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29. A student mixed 5 mL of acetic acid in 5 mL of water in a test tube. After shaking the mixturehe would observe that the resulting mixture is :(a) clear (b) turbid(c) showing precipitate (d) having two distinct layers of water and acid

5 mL 5 mL

(a) (b)

(c) (d)

30. A student took 2 mL acetic acid in a test tube. He added a pinch of X in it and found that a gasY is produced with effervescence. He also observed that the gas Y turns lime water milky.His correct conclusion on the basis of these observations may be X and Y are respectively.(a) sugar and CO2 gas.

(b) common salt and H2 gas

(c) sodium hydrogen carbonate and CO2 gas

(d) sodium hydrogen carbonate and hydrogen chloride gas

2 mL x

y y

x y

(a) CO2

(b) H2

(c) CO2

(d)

31. A teacher set up the stand carrying a convex lens of focal length 15 cm at 20.5 cm on the opticalbench. She asked four students A,B,C and D to suggest the position of the screen on the opticalbench so that a distinct image of a distant tree is obtained immediately on it. The positions ofscreen suggested by each of them were as-A ___at 35.5 cmB ___at 5.5 cmC ___at 50.5 cmD ___at 7.5 cm.

Correct position of the screen was suggested by(a) A (b) B (c) C (d) D

15 cm

20.5 cm A, B, C, D

A __ 35.5 cm

B __ 5.5 cm

C __ 50.5 cm

D __ 7.5 cm

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

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32. For determining focal length of a concave mirror, a teacher asks her students to Identify

concave mirror from a few mirrors lying on the table. The reason given by A,B,C and D for

picking up the right mirror is ___

A ___the mirror is depressed at the center and self image formed is enlarged and erect.

B ___the mirror is raised at the center and self image formed is smaller and erect

C ___the mirror is plane all over and self image is of same size

D ___the mirror is depressed at the center and self image formed is enlarged and inverted.

A, B, C, D

A __

B __

C __

D __

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

33. Students performed experiment to determine focal length of a convex lens. by obtaining imageof a distant tree on the screen. Their teacher asks four students A,B,C,D to describe nature andsize of image. Description given by them is ___

A ___Image is virtual, smaller and erectB ___Image is real, smaller and erect

C ___Image is virtual, enlarged and invertedD ___Image is real, smaller and inverted.

A, B, C, D

A __

B __

C __

D __

34. Four students traced the path of a ray of light through a glass slab as follows

correct path was traced by-(a) A (b) B (c) C (d) D

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

35. While tracing the path of a ray of light through a glass slab, Priya measured angle ofincidence(i), angle of refraction(r), and angle of emergence(e) in various sets of observationswhich were as -(i) = = (ii) > = (iii) = > (iv) < <

Correct relation is(a) i (b) ii (c) iii (d) iv

(i), (r),

(e)

(i) = = (ii) > = (iii) = > (iv) < <

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

36. The figures given below show the sequence of

(a) formation of bud in amoeba(b) formation of spores in amoeba(c) formation in daughter cells in amoeba(d) formation of protozoa in amoeba.

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

37. A slide showing several amoeba was given to a student and was asked to focus the amoebaundergoing binary fission. What will the student look for, to correctly focus on a livingamoeba?(a) An amoeba with many pseudopodia and a small nucleus.

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(b) A rounded amoeba with rounded nucleus.(c) An amoeba covered by a cyst and many nuclei.(d) An amoeba with elongated nucleus and a constriction in the middle.

Z

(a) (b)

(c)

(d)

38. The given figure shows asexual reproduction in yeast. What does A represent in it :-

(a) Daughter yeast cell (b) spore (c) nucleolus (d) nucleus

A

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

39. Which of the following statements best describes the phenomenon of Budding (a) a part of the parent body separates to form a new individual(b) bud derives nutrition from the parents body and separates when fully grown(c) it occurs during unfavourable conditions(d) in budding the organism formed is enclosed in a cyst

(a)

(b)

(c)

(d)

40. At the end of the experiment to determine the percentage of water absorbed by raisins, the

raisins are wiped just before weighing. This is to ensure that :

(a) hands do not get wet.

(b) the raisins lose water before weighing.

(c) the weighing scale does not get wet.

(d) only water absorbed by raisins is weighed.

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(a)

(b)

(c)

(d)

41. A student weighed 10 raisins and found their weight as A. She then soaked them in

50 mL of distilled water in a beaker. After 2 hours, she removed the raisins, wipe them dry

from outside and weighed again and found their weight to be B. For determining the

percentage of water absorbed by raisins she should calculate using the expression :

(a)B A

100A

(b)

B A100

B

(c)B A 1

A 100

(d) (BA)100

10 A

B

(a)B A

100A

(b)

B A100

B

(c)B A 1

A 100

(d) (BA)100

- o O o -