7/31/2019 67044 SC QP

1/16

Page 1 of16

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.

7/31/2019 67044 SC QP

2/16

Page 2 of16

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

67044

7/31/2019 67044 SC QP

3/16

Page 3 of16

SECTION-A /

1. Mention the percentage of carbon in earths crust.

2. Name the part responsible for the power of accommodation of the human eye.

3. State two advantages of paper bags over plastic bags during shopping.

4. Which one of the following is always at the third trophic level in a food chain ?

Carnivores, herbivores, producers, decomposers

5. Given below is a list of elements along with their atomic numbers in parenthesis.

A(6), B(8), C(10), D(12), E(14), F(16)

Select the element which has :

(a) two shells both of which are completely filled with electrons.

(b) the electronic configuration 2, 8, 2

(c) a total of three shells, with four electrons in its valence shell.

(d) a total of two shells, with four electrons in its valence shell.

A(6), B(8), C(10), D(12), E(14), F(16)

(a)

(b) 2, 8, 2

(c)

(d)

6. X is an element with atomic number 20.

(i) Is it a metal or a non metal ?

(ii) Which of the two X or Mg with atomic number 12 is more reactive ?

(iii) What is the valency of X ?

(iv) What will be the formula of its chloride ?

X 20

(i)

(ii) X Mg 12

(iii) X(iv)

7/31/2019 67044 SC QP

4/16

Page 4 of16

7. (a) What is the fate of the ovules and the ovary in a flower after fertilization ?(b) How is the process of pollination different from fertilization ?

(a) {ZfoMZ Ho$ nMmV {H$gr nwn | ~rOmS> VWm AS>me H$m m hmoVm h?(b) {ZfoMZ H$s {H$m namJU go {H$g H$ma {^ hmoVr h?

8. Write two functions each of :(a) Testis(b) Ovaries

oH$ Ho$ Xmo-Xmo H$m {b{IE &(a) dfU(b) AS>me

9. A ray of light strikes the surface of water such that its speed in water is 2.25 x 108 m/s. Ifabsolute refractive index of water is 4/3, find the speed of light in air.

2.25108 ms1

4/3

10. What is meant by least distance of distinct vision ? How does this vary between the very youngand old people ?

11. Explain why the colour of the clear sky is blue.

12. Why should fossil fuels be used judiciously? Write any two reasons.

13. Name the three `R s to save environment. Explain any one with the help of one example.(Write in full form)

R

14. (a) Identify from the following the hydrocarbon that undergo addition reaction :C3H8, C2H6, CH4, C2H4 .Justify your answer.

(b) Write the name of the homologous series to which they belong to.

(a)

C3H8, C2H6, CH4, C2H4

(b)

15. The position of three elements A, B and C in the modern periodic table is shown

below :

7/31/2019 67044 SC QP

5/16

Page 5 of16

Giving reasons, explain the following :

(a) Element A is a metal.

(b) Atom of element C has a larger size than atom of element B.

(c) Element B has a valency of 3.

A, B C

(a) A

(b) B C

(c) B 3

16. (a) Mention two secondary sexual characters in human male.(b) Why testes in male body are extra-abdominal ?(c) Write the dual purpose served by urethra in males.

(a) _mZd Za Ho$ Xmo {VrH$ mZ bjUm| H$m CboI H$s{OE&(b) mZd ZaHo$ dfU CXa Jwhm Ho$ ~mha m| hmoVo h?(c) mZd ZaHo$y_mJmam {H$E OmZo dmbo Xmo H$m {b{IE&

17. Given below is the experiment carried out by Mendel to study inheritance of two traits ingarden pea.

7/31/2019 67044 SC QP

6/16

Page 6 of16

(a) What do A, B, C, D, E, F and G represent in these boxes ?(b) State the objective for which Mendel performed this experiment.

(a) A, B, C, D, E, F G

(b)

18. From the set of Figures given below, make a pair of (i) homologous and (ii) analogous organs.State the reason in each case to justify your answer.

7/31/2019 67044 SC QP

7/16

Page 7 of16

(i) (ii)

19. What are fossils ? How are they formed ? How is the age of a fossil determined ?

20. Give reasons for the following :(a) Concave mirror is used by dentists.(b) Convex mirrors are commonly used as rear view mirrors in vehicles.(c) Convex lens is used as a magnifier.

(a)

(b)

(c)

21. A convex lens of focal length 40 cm and a concave lens of focal length 50 cm are placed incontact with each other. Calculate the (a) power, and (b) focal length of this lens combination.

40 cm 50 cm

(a) (b)

22. State the cause of dispersion, when white light enters a glass prism. Explain with a diagram.

23. (a) Write the name of the following compound :

CH3CH2COOH, C6H6

7/31/2019 67044 SC QP

8/16

Page 8 of16

(b) What is a homologous series ? Write the formula of functional group of ketone and

aldehyde

(c) What will happen if methanol reacts with ethanoic acid in the presence of an acid ?

Name the reaction. Write the chemical equation for this reaction.

(a)

CH3CH2COOH, C6H6(b)

(c)

OR/

(i) How will you bring about following reactions ? Write the concerned chemical equation :(a) Ethanol to Ethane(b) Ethanol to Ethanoic acid.

(ii) Give one example with chemical equation for following reactions :(a) Substitution reaction.(b) Saponification reaction.(c) Combustion reaction.

(i)

(a)

(b)

(ii)

(a) (b) (c)

24. (a) List two advantages of sexual reproduction over asexual reproduction.

(b) Name the type of asexual reproduction seen in :(i) Plasmodium (ii) Planaria

(c) Draw a diagram of Rhizopus showing the location of :(i) Sporangium (ii) Rhizoidal hyphae.

(d) How will an organism be benefited if it reproduces through spores ?

(a) Ab{JH$ OZZ H$rVwbZm | b{JH$ OZZ Ho$ Xmo bm^ H$s gyMr ~ZmBE&(b) ZrMo {XE JE Ordm| | {XImB XoZo dmbo Ab{JH$ OZZ Ho$ H$ma H$m Zm {b{IE-

(i) bmo{S> (ii) bZo[am

(c)amBOmong H$m AmaoI IrMH$a {ZZ{b{IV H$s pW{V XemBE -(i) ew ~rOmUwYmZr (ii) amBOmong H$m H$dH$ Omb

(d)~rOmUw mam OZZ go Ord {H$g H$ma bm^mpdV hmoVm h?OR /

(a) Draw a diagram to show human male reproductive system and label the followingorgans : seminal vesicle, prostate gland, vas deferens, penis.

(b) List two contraceptive methods and state two benefits of adopting thesemethods.

(a) mZd Za OZZ V H$m AmaoI ItMH$a ZrMo {XE JE ^mJ Zmm{H$V H$s{OE - ewH$me`, moQ>oQ> J{W, ewH$dm{hZr{eZ$

(b) Xmo J^{ZamoYH$$ {d{Ym| H$s gyMr ~ZmBE VWm BZ {d{Ym| H$mo AnZmZo Ho$ Xmo bm^ {b{IE&

7/31/2019 67044 SC QP

9/16

Page 9 of16

25. (a) Define power of a lens.

(b) An object is kept at a distance of 18cm, 20cm, 22cm, and 30cm, from a lens of power

+5D.

(i) In which case or cases would you get a magnified image?

(ii) Which of the magnified image can be got on a screen?

(c) List two widely used applications of a convex lens.

(a)

(b) +5D 18cm 20cm, 22cm, 30cm

(i) / /

(ii)

(c)

OR/

(a) A very thin narrow beam of white light is made incident on three glass objects shownbelow. Comment on the nature of behaviour of the emergent beam in all the 3 cases.

(b) There is a similarity between two of the emergent beams. Identify the two.(c) When light enters from air to glass the angles of incidence and refraction in air and glass

are 45and 30 respectively. Find the refractive index of glass.

(Given that sin 45 =1

2; sin 30=1/2)

(a)

(b)

(c) 45 30

sin 45 =1

2

; sin 30=)

SECTION - B /

26. A thin plate of zinc metal is placed in a beaker containing aqueous ferrous sulphate solution.

The zinc plate is taken out after 15 mins. The colour of solution changes to:(a) deep yellow (b) deep green(c) light blue (d) colourless.

7/31/2019 67044 SC QP

10/16

Page 10 of16

15

(a) (b)

(c) (d)

27. When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution takenin a test tube, the change which is observed is:(a) the green solution slowly fades(b) the lower end of the test tube becomes slightly warm(c) a colourless gas with the smell of burning sulphur is observed(d) light green solution changes to blue.

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

28. Deepa was asked to identify bottles of acetic acid from a shelf where a number of other labelledbottles were placed. She reads the labels as :(i) Vinegar (ii) Formic acid (iii) Ethanoic acid (iv) EthanolCorrect identification would be-(a) i ,ii (b) i , iv (c) ii, iv (d) i, iii

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

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

29. Manoj was asked to list the properties of acetic acid after he had studied them in the laboratory.According to him acetic acid(i) is insoluble in water.(ii) turns blue litmus paper red.(iii) reacts with Na2CO3 to form NaOH and CO2.(iv) has sweet smell like perfume.

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

(i)

(ii)

(iii) Na2CO3 NaOH CO2

(iv)

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

7/31/2019 67044 SC QP

11/16

Page 11 of16

30. Ethanoic acid was added to Sodium bicarbonate solution and the gas evolved was tested withburning splinter. Which one of the following four observations is correct ?(a) The gas burns with pop sound and the flame gets extinguished.(b) The flame gets extinguished and gas does not burn.(c) The gas burns with a blue flame and the splinter burns brightly.(d) The gas is brown in colour.

?

(a)

(b)

(c)

(d)

31. A student suggested the following guidelines to his friend for doing the experiment on findingthe focal length of a convex lens.A : Select a distant tree or building as object.B : Use a thin white paper to act as a screen.C : Place the convex lens in front of screen and adjust it to get clear image on the screen.D : Measure the distance between the lens and the screen.When he showed these guidelines to his teacher, the teacher modified the guidelines labelled as(a) A (b) B (c) C (d) D

A :B :

C :

D :

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

32. While determining the focal length of a concave mirror by forming an image of a distant object,

the screen should be placed(a) at the back of mirror (b) in front of the mirror(c) at right angle with plane of mirror (d) any where near the mirror

(a) (b)

(c) (d)

33. To determine the focal length of given convex lens a student focussed the image of a distantobject on a screen using the lens. To get the correct value of focal length he should measure the

distance between(a) object and the screen (b) object and the lens(c) screen and the lens (d) object and the image

7/31/2019 67044 SC QP

12/16

Page 12 of16

(a) (b)

(c) (d)

34. While performing the experiment on tracing a ray of light passing through a rectangular glassslab, 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 ?

7/31/2019 67044 SC QP

13/16

Page 13 of16

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

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

7/31/2019 67044 SC QP

14/16

Page 14 of16

36. Which of the following represent binary fission in amoeba ?

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

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

37. A student is observing two permanent slides, one of binary fission in amoeba and other ofbudding in yeast. He would identify one difference in the nucleus of the two as(a) presence of a single nucleus each in amoeba, yeast cell and its attached bud.(b) presence of two distant nuclei in amoeba, one in yeast cell and two in bud.(c) presence of one nucleus in amoeba, two in yeast cell and one in bud.(d) presence of two nuclei in centrally constricted amoeba, one in yeast cell and one in its

bud.

(a)(b)

(c)

(d)

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)

7/31/2019 67044 SC QP

15/16

Page 15 of16

39. Following diagrams were drawn by four students A, B, C and D on having observed theprepared slides of budding in yeast. The correctly drawn diagram(s) is/are

(a) A, B and C (b) B, C and D (c) C, D and A (D) D, A and B

A, B, C D

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

40. While performing the experiment to find percentage of water absorbed by raisins, a teacherasked her students to put 5 raisins each in 3 solutions A, B, C. After 2 hrs it was seen that :-

* Size of the raisins did not change in solution A* Raisins swelled up in solution B* Raisins shrunk in solution CThe teacher asked them to identify the correct statement in reference to the 3 solutions:-(a) A is isotonic , B is hypotonic, C is hypertonic(b) A is isotonic, B is hypertonic , C is hypotonic(c) A is hypotonic, B is hypertonic, C is isotonic(d) A is hypertonic, B is isotonic , C is hypotonic

A, B, C

5 2

* A* B

* C

(a) A , B , C

(b) A , B , C

(c) A , B , C

(d) A , B , C

41. Group X raisins are kept in water at 5 degrees Celsius and group Y raisins are kept in water at30 degrees Celsius. It will be observed that

7/31/2019 67044 SC QP

16/16

Page 16 of16

(a) Raisins in Group X are swollen more than those in Group Y(b) Raisins in Group Y are swollen more than those in Group X(c) Raisins of both the Group are equally swollen(d) Raisins of Group X get contracted while that of Y are swollen

X 5C Y 30C

(a) X Y

(b) Y X

(c)

(d) X Y

- o O o -