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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, 2012SCIENCE /

Class X / XTime 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

SC 2044

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SECTION A /

1. What is common name of CH3CCOH ?

CH3CCOH

2. On which factor does the colour of the scattered white light depend ?

3. What is an Ecosystem ?

4. Among the given organisms identify the organism that has the maximum concentration ofharmful chemicals if we form a food chain. Give reason for your answer :-Rat , peacock, wheat grains, snake.

5. (a) State Modern periodic law.(b) Write the electronic configuration of the element which belongs to second period and

third group of the periodic table.

(a)

(b)

6. (a) Why does atomic size decrease as we move from left to right along a period in the

periodic table ?(b) How many groups and periods are there in the modern periodic table ?

(a)

(b)

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. (a) Define Refraction.(b) A ray of light incident an one face of a rectangular glass slab emerges from the

opposite face of the slab parallel to the direction of the incident ray. Why does ithappen so ?

(a)

(b)

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10. Why do stars twinkle ? Explain with the help of diagram.

11. (a) Define distance of distinct vision and give its range.

(b) What is the role of iris in a human eye ?(a)

(b)

12. Name four basic elements present in fossil fuels.

13. What important message is conveyed by Amrita Devi Bishnoi Award for wildlife

conservation ?

14. (a) Draw a diagram to illustrate formation of triple bond between two atoms of

Nitrogen. (Atomic number of Nitrogen is 7)

(b) Out of two compounds ethane and ethene, which is more reactive ? Give reason

for your answer.

(a) 7

(b)

15.

Group 13 Group 17

-- B

-- C

-- --

A D

Using the given part of the periodic table, answer the following questions

(a) Compare the electro negativities of A and D.

(b) What is the valency of element D ?

(c) Out of the element given above name the most non metallic element in group 17.

13 17

-- B

-- C

-- --

A D

(a) A D

(b) D

(c) 17

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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. 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.

(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. (2 points)

20. The refractive indices of alcohol and turpentine oil with respect to air are 1.36 and 1.47

respectively. Find the refractive index of turpentine oil with respect to alcohol. In which of

the two medii the speed of light will be more ?

1.36 1.47

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21. (a) Define power of a lens and give its units.

(b) A convex lens forms a real and inverted image of a needle at a distance of 50cm from

it. Where is the needle placed in front of this lens if the image is equal to the size of

the object ? Also find power of the lens.

(a)

(b) 50cm

22. What is hypermetropia ? Draw ray diagrams to show the image formation of an object by :

(i) Hypermetropic eye,

(ii) Correction made with a suitable lens for hypermetropic eye.

(i)

(ii)

23. (a) Complete the following equation

4Alkaline KMnO Heat3 2CH CH OH

What is the role of alkaline KMnO4 in the above chemical change ?

(b) Name the following compounds :

(a) CH3CH2CH2CH3

(b) CH3 COCH3(c) Name and define the property due to which carbon is able to form bonds with other

carbon atoms.(a)

4KMnO3 2CH CH OH

KMnO4

(b)

(a) CH3CH2CH2CH3

(b) CH3 COCH3

(c)

OR/

(a) What happens when a piece of sodium metal is dropped in ethanol ? Write the

chemical reaction involved.

(b) Some time bottoms of cooking vessels (get blackened) while cooking food When and

why does it so happen ?

(c) Differentiate between saturated and unsaturated hydrocarbons. (2 points)

(a)

(b)

(c)

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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 ? Also

name 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.

Also name the process involved.

(a)

(i)

(ii)

(iii) DNA

(b)

25. (a) For a concave mirror draw ray diagram to show reflected ray for a ray incident (i) at its pole(ii) at its centre of curvature

(b) Which type of mirror is used by a dentist to examine teeth and why ?(c) An object 5cm in length is held 25cm away from a converging lens of focal length

10cm. Find the position, size and nature of image.

(a)

(i)

(ii)

(b)

OR/

(a) A point object is placed at a distance of 12cm from a convex lens on its principal axis.Its image is formed on the other side of the lens at a distance of 18cm from the lens.Find the focal length of the lens. Is the Image magnified ?Justify your answer by drawing a diagram for the same. (Diagram maynot be drawnto scale)

(b) Draw ray diagrams to show image formation by a convex lens when object is at(i) between focus and optical centre(ii) between F and 2F

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(iii) beyond 2F

(a) 12 cm

18 cm

(b)

(i)(ii) F 2F

(iii) 2F

SECTION B /

26. Time taken for the colour of ferrous sulphate solution to turn colourless when Aluminium

metal is added to it is approximately.

(a) Few seconds (b) 2 hours

(c) 24 hours (d) 30 minutes

(a) (b) 2

(c) 24 (d) 30

27. A student added Aluminium, copper, Zinc and iron metals to copper sulphate solution in 4

different test tubes. In one of the test tubes he observed that no colour change of coppersulphate solution took place. Mark that test tube ?

(i) Test tube 1 Aluminium + copper sulphate

(ii) Test tube 2 Zinc + copper sulphate

(iii) Test tube 3 Copper + copper sulphate

(iv) Test tube 4 Iron + copper sulphate

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

(i) 1 +

(ii) 2 +

(iii) 3 +

(iv) 4 +

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

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(a) 41cm (b) 40cm (c) 20cm (d) 60cm

32. A student mounts a spherical mirror on a mirror stand and places the stand along a metre

scale at 22cm mark. In front of spherical mirror he mounts a white screen and moves it back

and forth along the metre scale, till a highly sharp, well defined image of a distance building

is formed on the screen, now at 45.5cm mark of the metre scale. What is the focal length of

the mirror ?

(a) 10cm (b) 23.5cm (c) 17.25cm (d) 15.5cm

22 cm

45.5cm

(a) 10cm (b) 23.5cm (c) 17.25cm (d) 15.5cm

33. Three students measured the focal length of a convex lens using parallel rays from distant

object. All of them measured the distance between the lens and the inverted image on

screen. Student A saw a sharp image on the screen and labelled the distance as f1

Student B saw a slightly larger blurred image on the screen and labelled the distance as f2

Student C saw a smaller blurred image on the screen and labelled the distance as f3.

The likely relationship between f1 , f2 and f3 would be ___________(a) f1 f2 f3 (b) f1 < f2 and f3

(c) f3 < f1 < f2 (d) f1 < f2 and f1 f3

A f1

B f2

C f3

F1, f2, f3(a) f1 f2 f3 (b) f1 < f2 f3

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(c) f3 < f1 < f2 (d) f1 < f2 f1 f3

34. 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

35. A student has to perform an experiment on tracing the path of a ray of light passing through

a rectangular glass slab for different angles of incidence. Which of the following figures

shows correct labelling so that he can get a correct measure of the angles of incidence and

the angles of emergence ?

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

(a) A (b) B (c) C (d) D36. During the process of binary fission of amoeba

(a) cytoplasm first divides followed by the division of nucleus.

(b) nucleus first divides followed by the division of cytoplasm.(c) both nucleus and cytoplasm divide simultaneously.(d) only nucleus divides while cytoplasm remains as it is.

(a)

(b)

(c)

(d)37. Daughter cells produced as a result of asexual reproduction in amoeba are :

(a) exact copies of parent cell.

(b) totally dissimilar to parent cell.(c) partially similar to parent cell.

(d) one is like and the other is unlike the parent cell.

(a)

(b)

(c)(d)

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38. Which of the following figures shows budding in yeast :-

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

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

39. A pinch of yeast was added to a glucose solution and left overnight in a warm place. Nextday a drop of the suspension was observed on a slide under a microscope. The expectedresult would be :-

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

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

40. A 60% sugar solution was found to be isotonic for raisins. When equal number of raisinswere dropped by Ashok in solution A with 4g sugar in 10ml water, in solution B with8g sugar in 10ml water, in solution C with 6g sugar in 10 ml; it will be observed that raisinsare (a) swollen in A and B and remain unchanged in C

(b) swollen in A, shrink in B and remain unchanged in C(c) shrink in A, swollen in B and remain unchanged in C(d) shrink in A, remain unchanged in B and shrink in C.

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60%

A 4g 10 ml B 8g 10 ml C

6g 10 ml

(a) A B C

(b) A B C

(c) A B C

(d) A B C

41. 2g of dry raisins are soaked in water for 2 hours and the swollen raisins now weigh 3.5g.

The percentage of water absorbed by raisins is :

(a) 75% (b) 40% (c) 35% (d) 60%

2g 2

3.5g

(a) 75% (b) 40% (c) 35% (d) 60%

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