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Important Instructions for theSchool Principal

(Not to be printed with the question paper)

1) This question paper is strictly meant for the use in School Based SummativeAssessment-II, March-2012 only. This question paper is not to be used for any otherpurpose 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 isallowed to publish, print or convey (by any means) to any person not authorised bythe Board in this regard.

3) The School Principal is responsible for the safe custody of the question paper or anyother material sent by the Central Board of Secondary Education in connection withSchool based SA-II, March-2012, in any form including the print-outs, compact-discor 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, 2012II, 2012

SCIENCE /

Class X / X

Time allowed : 3 hours Maximum Marks: 80

380

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 fivequestions 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 appropriateresponse 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

SC - 2017

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SECTION-A /

1. What is the difference between two consecutive members in a homologous series inalkanes terms of(i) molecular mass(ii) number of atoms of elements.

(i)(ii)

2. Name the two phenomenon involved in the formation of rainbow.

3. What are biodegradable substances ? Give two examples.

4. What is meant by biological magnification ?

5. How does the metallic character of the elements vary (i) in a group (ii) in a period ofthe modern periodic table ?

(i) (ii)

6. Na, Mg, Al and P belong to 3 rd period but are placed in first, second, thirteenth andfifteenth group. Number of shells occupied in Mg is three. What is the number ofoccupied shells in Na, Al and P. Give reason for your answer.Na, Mg, Al P

Mg Na. Al P

7. What is the significance of vegetative propagation ? List any two advantages of thismethod of propagation.

8. How does the embryo get nourishment inside the mothers body ?

9. Draw the ray diagram for the formation of image by a concave mirror when theobject is placed between the principal focus and pole of the mirror. State the natureof the image formed.

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10. (a) What is meant by dispersion of light ?(b) Mention the colours which bend least and most respectively after white light

emerges from a prism.(a)(b) i ii

11. (a) List the factors on which scattering of light depends.(b) What is Tyndals, effect ?(a)(b)

12. Although coal and petroleum are produced by degradation of bio mass, yet we needto conserve them. Why ? Mention two reasons

13. The advantages of water stored in the ground are many. State two of them.

14. An organic compound A of molecular formula C 2H 6O on oxidation with dilutealkaline KMnO 4 solution gives an acid B with the same number of carbon atoms .Compound A is often used for sterilization of skin by doctors.(i) Name the compounds A and B. (ii) Write the chemical equation involved in the formation of B from A

A C2H 6O KMnO 4

B A

(i) A B

(ii) A B

15. What is the number of elements in first , second and third period of the periodictable? Give reason for your answer.

16. (a) What happens when a pollen grain falls on the stigma ?(b) Draw a well labeled diagram showing germination of pollen grain on stigma .

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(a)(b)

17. Define Homologous and Analogous organs giving one example of each.

18. In Mendels monohybrid cross between tall and short pea plants, all offsprings weretall. What does this tell us about the trait ? What is the ratio of tall and short plantsin the F 2 generation ?

F2 ?

19. How is sex determined in human beings ? Give an example where sex determinationis regulated by environmental factors.

20. Name the spherical mirror used as :(a) 1. Shaving mirror

2. Rear view mirror in vehicles.3. Reflector in search lights.

(b) Write any three differences between a real and virtual image.

(a) 1.

2.

3.

(b)

21. 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 10cm from the lens ? Also find themagnifiction produced by the lens.

15 cm

10 cm

22. A student sitting on the last bench in a class room cannot read the black boardclearly.(i) Name the kind of defect of vision the student is suffering from.(ii) Name the type of spherical lens he has to use to correct this defect.(iii) State two possible reasons for this defect of vision.

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(i)(ii)

(iii)

23. (a) Explain with the help of chemical equation the following properties ofcarbon compounds.(i) Addition Reaction(ii) Substitution Reaction

(b) Differentiate between vegetable oils and animal fats.(c) What is meant by hydrogenation ?(a)

(i)(ii)

(b)(c) ?OR /

(a) Explain with the help of chemical equation the following properties of carboncompounds-(i) Combustion (ii) Oxidation

(b) How do saturated and unsaturated hydrocarbons can be differentiated on thebasis of their combustion?

(c) What are oxidising agents ?(a)

(i) (ii)(b)(c)

24. (a) What is meant by DNA copying ?(b) What is the importance of DNA copying in reproduction ?(c) Why is variation beneficial to species ? Illustrate with the help of an example.(a) DNA(b) DNA(c)

OR / (a) Explain the process of regeneration with the help of an example and suitable

diagram.(b) Differentiate between regeneration and reproduction(c) How does a hydra reproduce.(a)

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(b)(c)

25. (a) Define power of a lens. Write its SI units.(b) You are provided with two convex lenses of focal length 15 cm and 25cm

respectively. Which of the two is of larger power ? Give reason for youranswer.

(c) A 20cm tall object is placed perpendicular to the principal axis of a convexlens of focal length 10cm. The distance of the object from the lens is 15 cm.Find the nature, position and size of the image. Also find its magnification.

(a) SI(b) 15 cm 25 cm

(c) 20 cm 10 cm15 cm

OR / (a) Given below are refractive indices of a few material media

Ice 1.31dense flint glass 1.65Crown glass 1.52Rock salt 1.54Arrange the media in the ascending order of optical density

(b) A ray of light enters from air into water which has a refractive index 1.33. Ifthe velocity of light in air is taken 3x10 8ms -1 , find the velocity of light in

water.(c) A ray of light is incident from air to a medium at an angle of 45 . Its angle of

refraction is 30 . Find the refractive index of the medium with respect to air

(sin 30 =1

2 Sin 45 =1

2)

(a)1.311.651.521.54

(b) 1.333x108ms -1 ,

(c) 45

30

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(sin 30 =1

2 Sin 45 =1

2)

SECTION - B / 26. An iron nail was suspended in copper sulphate solution and kept for a while. The

solution(a) remained blue and a coating was formed on the nail.(b) turned green and a coating was formed on the nail.(c) remained blue and no coating was formed on the nail.(d) turned green and no coating was formed on the nail.

(a)

(b)

(c)

(d)

27. A strip of copper was placed in a beaker containing zinc sulphate solution. Onobserving the strip next day, it was noticed that(a) the copper strip remained as it was (b) the copper strip became thinner(c) the copper strip became thicker (d) the colour of the strip changed.

(a) (b)

(c) (d)

28. When the acetic acid is added to a solution of a substance X, a colourless andodourless gas Yis formed. The gas turns lime water milky. What is the substanceX ?(a) Sodium carbonate (b) Sodium hydroxide(c) Sodium acetate (d) Lime water

XY X

(a) (b)

(c) (d)

29. Acetic acid is taken in two test tubes. Blue and red litmus paper is put in each of thetest tube. It should be observed that

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(a) red litmus changes blue and blue litmus is unaffected.(b) blue litmus changes to red and red litmus remains unaffected(c) red litmus turns colourless and blue turns red(d) red and blue litmus turns colourless

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

30. Red litmus paper is dipped in 10 ml acetic acid in a test tube. Then a colourlesssolution X is added to the acetic acid in the test tube so that the litmus turns blue.The solution X could be :(a) dilute HC l (b) water(c) formic acid (d) sodium hydroxide

10 mlX X

(a) HC l (b)(c) (d)

31. In finding the image of a distant object of a tree by concave mirror, you are requiredto hold a vertical plane white board at :(a) Centre of curvature (b) pole(c) focus (d) behind mirror

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

32. Three students measured the focal length of a convex lens using parallel rays from adistant object. All of them measured the distance between the lens and the invertedimage on the screen.- Student A saw a sharp image on the screen and labeled the distance as f 1 - Student B saw a slightly larger blurred image on the screen and labeled the

distance as f 2 - Student C saw a slightly smaller blurred image on the screen and labeled the

distance as f 3 - The relation between the three measurements would most likely be :(a) f1 f2 f3 (b) f1< f2 and f 3 (c) f3< f1< f2 (d) f3> f2> f1

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- A f1- B f2

- C f3

-(a) f1 f2 f3 (b) f1< f2 f3 (c) f3< f1< f2 (d) f3> f2> f1

33. A teacher gave Manoj a convex lens of focal length 15.5 cm and asked it to verify byobtaining image of a distant object. Manoj placed the stand holding lens on opticalbench at 40.8 cm as shown below ?

For obtaining sharp image, he should keep the screen at -(a) 25.3 cm (b) 9.8cm (c) 56.3 cm (d) 71.8 cm

15.5 cm

40.8 cm

(a) 25.3 cm (b) 9.8cm (c) 58.3 cm (d) 71.8 cm

34. While performing the experiment to trace the path of ray of light passing through arectangular glass slab, four students labeled their ray diagrams in the mannersshown below. The correct labeling has been done by student

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

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

35. Four students A,B,C,D were asked to take three sets of observations for tracing thepath of a ray of light through a glass slab. The choices of different angle of incidencemade by them were as A - 10 , 15 , 20 B - 15 , 20 , 25 C - 30 , 45 , 60 D - 70 , 75 , 80 The student who is likely to get best result is _ (a) A (b) B (c) C (d) D

A,B,C,D

A - 10 , 15 , 20 B - 15 , 20 , 25 C - 30 , 45 , 60 D - 70 , 75 , 80

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

36. A student is given a permanent slide showing binary fission in Amoeba. Thefollowing are the steps in focusing the object under microscope.(i) Place the slide on the stage; look through the eye piece and adjust the mirror

and diaphram to get even illumination.(ii) Look through the eye piece and raise the objective using coarse adjustment

until the object is focused.(iii) Make the focus sharp with the help of fine adjustment.(iv) Look through the eye piece and move the slide until it is visible.

The proper sequence of steps is(a) (i), (iii), (iv) (ii) (b) (ii), (iii), (iv), (i)(c) (iv), (iii), (ii),(i) (d) (i), (iv), (ii), (iii)

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(i)

(ii)

(iii)(iv)

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

37. In the binary fission of amoeba (a) division of cytoplasm takes place first followed by division of nucleus.(b) Division of cytoplasm and nucleus takes place at the same time(c) division of cytoplasm and nucleus takes place in random manner(d) division of nucleus takes place first and then the equal distribution of

cytoplasm to daughter cells takes place.

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

38. Which of the following diagrams shows budding in Yeast ?

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

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

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39. The minimum number of parent cells required for budding in yeast is _ (a) One (b) Two (c) Three (d) Four

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

40. A student soaked 10g of raisins in 50mL of distilled water in two beakers A and Beach. She maintained beaker A at 25 degree C and beaker B at 50 degree C. After anhour, the percentage of water absorbed will be(a) the same in both A and B.(b) more in A than B.(c) more in B than in A.(d) exactly twice as much in B as in A

A B 50mL 10gA 25 C B 50 C(a) A B

(b) A B(c) B A(d) B A

41. Reena soaked 4g of raisins in 50ml of water overnight and next day weighed themafter drying them with blotting paper and found them to weigh 5g. The percentageof water absorbed by them is(a) 25% (b) 10% (c) 50% (d) 20%

4g 50ml5g

(a) 25% (b) 10% (c) 50% (d) 20%

- o 0 o -