Page 1 of 13

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.

Page 2 of 13

SUMMATIVE ASSESSMENT – II, 2012

II, 2012

SCIENCE /

Class – X / X

Time allowed : 3 hours Maximum Marks : 80

3 80

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 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 - 2022

Page 3 of 13

SECTION-A /

1. The molecular formula of „A‟ is C10H18 and „B‟ is C18H36. Name the homologous series to which they belong.

A B C10 H18 C18H36

2. We can see the sun for few minutes even after it has actually set. Why ?

3. What is Ozone ?

4. List two main components of our environment.

5. (a) Element „Y‟ with atomic number 3 combines with element „A‟ with atomic number

17, what would be the formula of the compound ? (b) What is electronic configuration of element with atomic number 10 ? What will be its valency ?

(a) 3 Y 17 A

(b) 10

6. How would the tendency to lose electrons change as you go

(a) from left to right across a period ? (b) down a group ?

(a)

(b)

7. List any two differences between pollination and fertilisation.

8. Name one sexually transmitted disease each caused due to (i) bacterial infection and (ii)

viral infection. How can these be prevented ?

(i) (ii)

9. For the same angle of incidence in media P, Q and R, the angles of refraction are 45,

35and15 respectively. In which medium will the velocity of light be minimum ? Give

reason for your answer.

P, Q R 45, 35 15

10. How will you use identical glass prisms so that a narrow beam of white light incident on

Page 4 of 13

one prism emerges out of the second prism as a beam of white light. Draw a labeled diagram to illustrate it.

11. A student has difficulty in reading the blackboard while sitting in the last row. What could

be the defect of vision the student is suffering from ? What are the causes for this disorder ?

12. (a) What is Chipko movement ?

(b) Why should we conserve forests ?

(a)

(b)

13. List four advantages of water stored in the ground.

14. Two compounds „A‟ and „B‟ have the molecular formula C3H8 and C3H6 respectively. Which

one of the two is most likely to show addition reaction ? Justify your answer. Explain with the help of a chemical equation, how an addition reaction is useful in vegetable ghee industry.

A B C3H8 C3H6

15. (a) How does the electronic configuration of an atom relates to its position (period and group) in the modern periodic table ? (b) Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because there chemical properties are the same ? Justify your answer.

(a)

(b) Cl-35 Cl-37

16. (a) Explain the terms (i) Implantation (ii) Placenta.

(b) What is the average duration of human pregnancy ?

(a) (i) (ii)

(b)

17. The genotype of green stemmed tomato plants is denoted by GG and that of purple

stemmed tomato plants as gg. When these two plants are crossed : (a) What colour of stem would you expect in their F1 progeny ?

Page 5 of 13

(b) Give the percentage of purple-stemmed plants if F1 plants are self-pollinated.

(c) In what ratio would you find the green and purple colour in the F2 progeny ?

GG gg

(a) F1

(b) F1

(c) F2

18. “It is a matter of chance whether a couple will give birth to a boy or a girl.” Justify the

statement.

19. Define the terms homologous and analogous organs by giving example.

20. What is the minimum number of rays required for locating the image formed by a convex

mirror for an object ? Draw a ray diagram to show the formation of a virtual image by a convex mirror.

21. A 4.0cm tall object is placed perpendicular to the principal axis of a convex lens of focal

length 20cm. If the distance of the object from the lens is 30cm, find the position, nature and size of the image. Also, find its magnification.

20cm 4 cm

30 cm

22. What is meant by power of accommodation of eye ? The minimum power of eye lens is 40D.

If the far point of normal eye is infinity find the size of eye ball.

40D

23. (a) What is a homologous series ? (b) What will happens if ethanoic acid reacts with ethanol in the presence of an acid as a catalyst ? Write the chemical equation for this reaction. (c) Why are soaps ineffective in hard water ? (d) Write the names of the functional groups in : (i) O

CH3C CH3

(ii) O

CH3CH2COH

(a)

(b)

Page 6 of 13

(c)

(d)

(i) O

CH3C CH3

(ii) O

CH3CH2COH

OR/

(a) Complete the following equations :

(i) 2 4conc. H SO

heat3 2CH CH OH

(ii) 3 3sunlight

CH COOH KHCO

(iii) CH4 Cl2

(b) Write the name of the following : (i) CH3CH2COOH (ii) CH3CH2CH2Br (c) Draw the electron dot structure of ethene (C2H4)

(a)

(i) 3 2

H SO2 4CH CH OH

(ii) CH3COOH KHCO3 →

(iii) 4 2CH C l

(b)

(i) CH3CH2COOH (ii) CH3CH2CH2Br

(c) (C2H4)

24. (a) Draw labelled diagram of the human female reproductive system.

(b) What is menstruation in females ?

(a)

(b)

OR/

(a) What is puberty ? Name the hormones responsible for production of secondary sexual characters in human beings. (b) Explain why the scrotum remains outside the body of human males ? (c) Name two methods used for the regulation of childbirth. (d) Which contraceptive method prevents the spreading of STD‟s ?

(a)

(b)

(c)

(d)

25. (a) 4.5cm needle is placed 12cm away from a convex mirror of focal length 15cm. Give

the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.

Page 7 of 13

(b) What kind of mirror is used in a solar furnace ? Give reason for using this mirror. (c) One half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object ? Justify your answer.

(a) 4.5 cm 15 cm 12 cm

(b)

(c)

OR/

(a) When an object is placed at a distance of 60 cm from a convex mirror the magnification produced is 1/2 . Where should the object be placed to get a magnification of 1/3 ? (b) A small electric lamp is placed at the focus of a convex lens. What is the nature of beam of light produced by the lens. Draw a diagram to show this.

(a) 60 cm 1/2

1/3

(b)

SECTION - B /

26. What is the colour of freshly prepared aqueous ferrous sulphate solution ?

(a) Light blue (b) Blue (c) dark green (d) Pale green

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

27. A Student takes Cu, Al, Fe and Zn strips, separately in four test tubes labeled as I, II, III and

IV respectively. He adds 10 mL of freshly prepared ferrous sulphate solutions to each of the test tube and observes the color of the metal residue in each case.

He would observe a black residue in the test tubes : (a) I and II (b) I and III (c) II and III (d) II and IV

I, II, III IV Cu, Al, Fe Zn

10 mL

Page 8 of 13

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

28. When the stopper of a bottle containing colourless liquid was removed, the bottle gave out a

smell like that of vinegar. The liquid in the bottle could be : (a) HCl solution (b) NaOH solution (c) Acetic acid (d) Saturated NaHCO3 solution

(a) HCl (b) NaOH

(c) (d) NaHCO3

29. 5 mL of ethanoic acid was taken in two test tubes I and II each as shown in figure. Blue and Red litmus paper were dipped in test tube I and solid NaHCO3 was added to II.

The following observations were reported. Select the correct report. (a) Red litmus turned blue in I and no change in II. (b) Blue litmus turned red in I and brisk effervescence in II. (c) Red litmus turned blue in I and gas with odour like vinegar in II. (d) Blue litmus turned red in I and gas which supports combustion evolved in II.

I II 5 mL I

II NaHCO3

(a) I II

(b) I II

(c) I II

(d) I II

Page 9 of 13

30. Acetic acid was added to a solid „X‟ kept in a test tube. A colourless, odourless gas „Y‟ was evolved. The gas was passed through lime water which turned milky. It was concluded that : (a) Solid X is NaOH, „Y‟ is CO2 (b) X is NaHCO3, „Y‟ is CO2

(c) X is CH3COONa, „Y‟ is CO2 (d) X is NaHCO3, „Y‟ is SO2

„X‟

„Y‟

„X‟ „Y‟

(a) Solid X is NaOH, „Y‟ is CO2 (b) X is NaHCO3, „Y‟ is CO2

(c) X is CH3COONa, „Y‟ is CO2 (d) X is NaHCO3, „Y‟ is SO2

31. To determine the focal length of a concave mirror four students P,Q,R and S obtained the image of an electric pole an a wall. They measured the distance as given below between : P electric pole and the wall only Q electric pole and the mirror only R mirror and the wall only S electric pole and the wall and also between the electric pole and the mirror. The correct focal length will be directly obtained by : (a) P (b) Q (c) R (d) S

P, Q, R S

P

Q

R

S

(a) P (b) Q (c) R (d) S

32. To determine the focal length of a convex lens by obtaining the sharp image of a distant object the following steps were suggested which are not in proper sequence : I Hold the lens between the object and the screen II Adjust the position of the lens to form a sharp image on the screen III Select a well illuminated distant object IV Measure the distance between the lens and the screen The correct sequence of these steps is : (a) III, I, II, IV (b) III, I, IV, II (c) III, II, I, IV (d) III, IV, I, II

I

II

III

IV

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

Page 10 of 13

33. By using a concave mirror a student obtained a sharp image of his laboratory window on a screen. His teacher suggested to focus some distant object such as a distant tree to get better results. In which direction should he move the lens for this purpose ? (a) Slightly away from the screen (b) Slightly towards the screen (c) Slightly toward the distant tree (d) Very far away from the screen

(a) (b)

(c) (d)

34. For a ray of light passing through a rectangular glass slab the lateral displacement is

correctly represented by :

(a) BC (b) BF (c) CF (d) DE

(a) BC (b) BF (c) CF (d) DE

35. In the diagram the correctly marked angles are :

(a) i and r (b) i and e

(c) r and e (d) i, r and e

Page 11 of 13

(a) i r (b) i e

(c) r e (d) i, r e

36. Four stages of binary fission in amoeba are shown below. The stage at which nuclear fission and cytokinesis are observed is, stage :

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

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

37. The two diagrams, given below, aim to show the sequence of events the binary fission in amoeba and budding in yeast. Binary fission in Amoeba

The correct sequence of events in the two diagrams respectively are : (a) (I, II, III, IV) and (V, VI, VII) (b) (IV, III, II, I) and (VII, VI, V) (c) (II, III, I, IV) and (VI, V, VII) (d) (III, I, II, IV) and (VI, VII, V)

Page 12 of 13

(a) (I, II, III, IV) (V, VI, VII) (b) (IV, III, II, I) (VII, VI, V)

(c) (II, III, I, IV) (VI, V, VII) (d) (III, I, II, IV) (VI, VII, V)

38. A student has to observe a slide of budding in yeast. The steps involved in observing a slide

under a microscope are given below. However these steps are not in a proper sequence. (I) Focus the object under high power of the microscope (II) Place the slide on the stage of the microscope. (III) Adjust the mirror to reflect maximum light on the slide (IV) Focus the object under low power of the microscope. The proper sequence of these steps is (a) II, III, I, IV (b) III, II, IV, I (c) II, I, III, IV (d) II, III, IV, I

(I)

(II)

(III)

(IV)

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

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

(a) Bud, nucleus of bud, yeast, nucleus of yeast (b) Dividing nucleus of bud, yeast, nucleus of yeast (c) Nucleus of bud, bud, yeast, diving nucleus of yeast (d) Dividing nucleus of yeast, yeast, bud, nucleus of bud.

Page 13 of 13

A, B, C D

(a)

(b)

(c)

(d)

40. A student soaked 5g of raisins in beaker (A) containing 25 mL of ice chilled water and

another 5g raisins in beaker (B) containing 25 mL of tap water at room temperature. After one hour the student observed that : (a) water absorbed by raisins in beaker (A) was more than that absorbed by raisins of beaker (B) (b) water absorbed by raisins in beaker (B) was more than that absorbed by raisins of beaker (A) (c) The amount of water absorbed by the raisins of both beakers (A) and (B) was equal. (d) No water absorbed by raisins in either of the beakers (A) and (B)

5g A 25 mL 5g

B 25 mL

(a) A B

(b) B A

(c) A B

(d) A B

41. Raisins are soaked in water for determining the percentage of water absorbed by raisins.

The formula, used by a student, for calculating the percentage of water absorbed, is :

(a) Final weight Initial weight

100Initial weight

(b)

Initial weight Final weight100

Initial weight

(c) Final weight Initial weight

100Final weight

(d)

Initial weight Final weight100

Final weight

(a) 100

(b) 100

(c) 100

(d) 100

- o O o -