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SUMMATIVE ASSESSMENT II, 2012

II, 2012SCIENCE /

Class X / XTime 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 answeredin 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 2040

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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. What is meant by dispersion of light ?

3. Select the biotic components of the environment from the following :-Fungi , soil , mango tree, temperature.

4. Why is the Government stressing upon the use of jute / cloth carry bags ?

/

5. (a) An element has electronic configuration 2, 8, 6. Explain its position in the periodic

table.

(b) Size of sodium atom is bigger than that of hydrogen atom. Why ?

(a) 2, 8, 6

(b)

6. (a) State modern periodic law.

(b) What is the similarity in the valency of all the elements of group 1 in the modern

periodic table ?

(a)

(b)

7. Which parts/organs of the human reproductive systems perform the following functions :-

(a) Site of fertilization

(b) Production of ova

(a)

(b)

8. List two suitable differences between pollen grain and ovule.

9. An object is placed at 25 cm in front of a concave mirror of focal length 15 cm. At what

distance from the mirror a screen be placed in order to obtain a sharp image ?

15 cm 25 cm

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10. A person can see distant sign boards clearly but cannot read clearly a book which is at 25 cmfrom his eye. Identify the defect. Draw a labelled ray diagram to illustrate how this defectcan be corrected.

25 cm

11. A person needs a lens of power 2.5 dioptres for correcting his vision. Name the defect ofvision he is suffering from. Which lens will he be using for the correction ? Also find the focallength of the lens.

2.5 D

12. Local people around forests are referred to as stakeholders for conservation of forests. Givereasons.

13. Name four basic elements present in fossil fuels.

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. Group 15 Group 16

A C

- D

- -

B E

Giving reasons, explain the following :(a) Element A is a non metal.(b) Element D is more electronegative than E.(c) Which type of ion, cation or anion will be formed by element C ?

15 16

A C

- D

- -

B E

(a) A(b) D E

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(c) C

16. (a) Name an organism that reproduces by Regeneration.(b) How does the developing embryo get nourishment in the mothers body ?

(a)

(b)

17. Genetic composition of the father plays a deciding role in determining the gender of the new-born child. Comment and support your answer with a suitable illustration.

18. (a) Giving reasons state whether the following are Homologous or Analogous organs :-(i) Wing of a bat and wing of a bird(ii) Forelimbs of humans and bird

(b) Define Variation.

(a)

(i)

(ii)

(b)

19. Look at the given picture and give a suitable caption to it. List its any two significance inrelation to evolution of life.

20. A 2 cm tall object is placed at a distance of 25 cm from a convex lens of focal length 10 cm.

Find the nature, size and position of the image so formed.

2 cm 10 cm 25 cm

21. (a) State Snells law of refraction.

(b) With respect to air the refractive index of kerosene is 1.44 and that of diamond is 2.42.

Calculate the refractive index of diamond with respect to kerosene.

(a)

(b) 1.44 2.42

22. Describe the formation of rainbow in the sky with the help of a labelled diagram.

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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 COOC2H5 NaOH

(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) Explain what is Menstruation. List two methods of contraception and explain how

they work.

(b) Draw a germinated seed and label the future root, future shoot and structure that

stores food.

(a)

(b)

OR/

(a) Give reasons :-

(i) Wind acts as a pollinating agent.

(ii) Variation is essential and beneficial to a species.

(iii) Use of condoms prevents pregnancy.

(b) Draw a neat diagram of human male reproductive system and label its four important

parts.

(a)

(i)

(ii)

(iii)

(b)

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25. (a) Define principal focus, focal length and principal axis of a lens.

(b) Draw ray diagrams to show the principal focus of a

(i) convex lens

(ii) concave lens

(a)

(b) (i) (ii)

OR/

(a) A ray of light AM is incident on a spherical mirror as shown in the diagram.

Redraw the diagram and show the path of reflected ray.

(b) Name the type of mirror which always forms a virtual and diminished image of the

object in front of it. Draw the diagram for the same for an object in front of it at a finite

distance. State any one use of it.

(a) AM

(b)

SECTION B /

26. A student added aluminium, copper, zinc and iron pieces to copper sulphate solution taken infour different test tubes. A, B, C and D as shown in the following table

Test tube A Aluminium + Copper sulphate solution

Test tube B Zinc + copper sulphate solution

Test tube C Copper + copper sulphate solution

Test tube D Iron + copper sulphate solution

The test tube in which no change in colour was observed is

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

A, B, C D

A +

B +C +

D +

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

27. The correct observation of the experiment conducted by a student in which he reacted iron

with copper sulphate solution is reported at the serial number.

S.No. Initial colour of the solution Final colour of the solution

A Blue Colourless

B Blue Pale green

C Pale green Blue

D Blue Blue

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

A

B

C

D

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

28. A brisk effervescence was observed by a student when he added acetic acid in the test tubes-

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

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

29. For recording the odour of acetic acid(A) It should be taken in a test tube and heated(B) It should be rubbed in fingers and then smelled(C) The test tube containing Ethanoic acid should be taken as close as possible to the nostrils

and then smelled.(D) The vapour of Ethanoic acid should be waved with one hand slowly towards the nostrils

and then smelled.(a) A (b) B (c) C (d) D

(A)

(B)

(C)(D)

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

30. Study the following sets of properties of acetic acid

S. No Colour Odour Reaction with Na2CO3

A blue fruity Effervescence

B colourless like vinegar Effervescence

C light green like vinegar gas evolves

D colourless odourless EffervescenceThe correct set of properties is

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

Na2CO3

A

B

C

D

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

31. Parallel rays, from the top of a distant tree, incident on a concave mirror, form an image on thescreen. The correct diagram showing the image is

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

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

32. Three students A , B and C followed the procedure listed to find the focal length of a convex

lens

A : Kept the lens as well as screen on a stands to get a sharp image of a distant object on the

screen.

B : Kept the lens on a stand and held the screen in hand for a sharp image.C : Kept the lens in hand and moved it to get a sharp focus.

Who is correct ?

(a) A (b) B (c) C (d) All of them

A, B C

A :

B :

C :

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

33. A student performs an experiment to find the focal length of a convex lens. The image formedin this case would be :(a) real and enlarged (b) virtual and enlarged(c) virtual and diminished (d) real and diminished

(a) (b)

(c) (d)

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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 itsbud.

(a)

(b)

(c)

(d)

38. Which one of the following does not represent budding in yeast

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

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

39. Out of the given diagrams, the correctly labelled diagram showing budding in yeast is :

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

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

40. The necessary step(s) for determining the percentage of water absorbed by raisins is / are :

(a) The raisins should be free from dust before immersing in water.(b) The raisins should be soaked in water for sufficient time.(c) The soaked raisins should be wiped dry before final weighing.

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(d) All the above steps.

/

(a)

(b)

(c)

(d)

41. While performing an experiment with raisins, a student recorded the following data : -Mass of water taken in beaker = 100 gMass of raisins before soaking = 20 gMass of raisins after soaking = 24 gThe percentage of water absorbed by the raisins is(a) 10% (b) 20% (c) 45% (d) 50%

= 100 g

= 20 g= 24 g

(a) 10% (b) 20% (c) 45% (d) 50%

- o O o -