summative assessment – ii, 2012 - anil tutorials

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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

67027

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SECTION-A /

1. Identify saturated hydrocarbons from the following compounds :-

C2H4 , CH4, C3H6, C2H2 , C4H10

C2H4 , CH4, C3H6, C2H2 , C4H10

2. Define the near point and far point of a normal eye ?

3. Which chemical is used in fire extinguishers ? How is it harmful?

4. Pick the non-biodgradable substances from the following :

Animal bones, wool, paper, glass.

5. How can we calculate valency of an element from its position in the periodic

table ? How does the valency vary on moving from : (i) left to right in a period, (ii) top to bottom in a group ?

(i)

(ii)

6. An element X belongs to 13th group of periodic table. Find its valency. What will be the

formula of its sulphate ?

„X‟ 13

7. Explain the role of cotyledon and plumule in germination.

8. “In Human male reproductive system, testes is located outside the abdominal cavity” – Give

reason for its such location. State the role of testes in male reproductive system.

9. What happens to the speed of light when it undergoes :

(i) reflection from a surface and (ii) refraction in a medium ? Hence define absolute refractive index of a medium.

(i)

(ii)


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10. “The time difference between actual sunset and the apparent sunset is about 2 minutes”.

Explain this fact with the help of diagram.

11. A person suffering from defect in vision can see nearby objects clearly but cannot see distant

objects distinctly.

(i) Name the defect of vision he is suffering from. State one cause of this defect.

(ii) With the help of diagram, show how this defect can be corrected with the help of a suitable lens.

(i)

(ii)

12. Write any two environmental friendly practices that should be adopted at school level so that

consumption of fossil fuels is minimised.

13. Mention two reasons to explain why forests and wild-life should be conserved.

14. (a) Write a test to distinguish between Ethyl alcohol and Ethanoic acid.

(b) Write structural formula of the functional group present in Propanal.

(c) Explain why soaps are not effective cleansing agents in hard water ?

(a)

(b)

(c)

15. The positions of five elements in the periodic table are shown below :

Group - 1 Group - 2 Group - 15 Group - 16

Period II A B

Period III C D E

(a) What are the number of valence electrons in B ? Identify the element (s) which : (b) will have the smallest atomic radius ? (c) will be the most metallic ?


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(d) will form basic oxide ? (e) will show valency three ? (f) will show greatest tendency to gain electron ?

- 1 - 2 - 15 - 16

II A B

III C D E

(a) B

(b)

(c)

(d)

(e)

(f)

16. (a) Name the thread like structure found in the bread mould. Draw a diagram to show

spore formation in (Rhizopus). (b) Write features of its reproductive cells.

(a)

(b)

17. “Only variations that confer advantage to an individual organism will survive in a population.”

Do you agree with this statement ? Why or why not ? Explain with an example in a population of red beetle.

18. (a) Explain how is sex determination controlled by environmental factors in some animals ?

(b) Sex is genetically determined in human beings. Justify this statement.

(a)

(b)

19. Explain various factors which could lead to the formation of new species.

20. (i) Define (a) Focal length, (b) optical center of a concave lens with the help of ray iagrams.

(ii) A point sized image of an distant object is formed at the principal focus of a concave lens. If the object starts moving towards the lens, how will the position of the image change ? Illustrate it with a suitable ray diagram.

(i) (a) (b)

(ii)


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21. (i) What is meant by lateral displacement of light when it passes through a glass slab ?

Draw a clear labelled diagram to illustrate it. (ii) What will be the lateral displacement of a ray of light incident normally on the face of glass slab ? Draw a clear diagram to show it.

(i)

(ii)

22. (a) Draw a diagram to illustrate dispersion of light by a prism.

(b) Mention the colours for which each letter in the word VIBGYOR stands for. (c) Write the colours which get deviated most and least respectively after passing through

prism.

(a)

(b) VIBGYOR

(c)

23. (i) Complete the following equation and answer the questions given below :

2 43 2CH CH OH

Hot conc. H SO

(a) Name the products of the reaction. (b) What is the role of hot conc. H2SO4 in the above chemical change ? (ii) Draw electron dot structure for a molecule of methane. (iii) Name the following compounds (a) CH3-CH2-Cl (b) HCOOH

(i)

2 4 H SO3 2CH CH OH

(a)

(b) H2SO4

(ii)

(iii)

(a) CH3-CH2-Cl (b) HCOOH OR (i) What happens when a piece of sodium metal is dropped in ethanol ? Write the

chemical reaction involved. (ii) When do the bottoms of cooking vessels get blackened ? (iii) Write the structure of Cyclohexane and benzene.

(i)

(ii)

(iii)

24. Give reasons for the following :

(a) Placenta has villi on embryo‟s side. (b) Oral pills are hormonal preparations. (c) Uterine linings are thick and spongy. (d) Sperms have a long tail.


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(e) Prenatal sex determination has been prohibited by laws.

(a)

(b)

(c)

(d)

(e)

OR (i) Draw a neat diagram of human male reproductive system and label the parts :

(a) the glands from which the secretion of fluid occurs for nourishment of sperms. (b) the tube which delivers the sperms formed. (c) the tube which forms common passage for both sperms and urine. (d) the cavity where testes are located. (ii) Name the organ that secretes testosterone hormone. Write its two functions.

(i)

(a)

(b)

(c)

(d)

(ii)

25. (i) Identify the type of spherical mirror in each of the following case :

(a) Object is placed between infinity and mirror and image formed is virtual, erect, diminished and on the other side of the mirror. (b) Object is placed between the focus and mirror, image formed is virtual, erect enlarged and on the other side of the mirror. Draw ray diagram for each case. (ii) The radius of curvature of a convex mirror used on a bus is 2.0 m. A car coming behind

it is at a constant distance of 3.0 m from it. Calculate : (a) the position and (b) the relative size of image of the car. What will be the nature of image ?

(i)

(a)

(b)

(ii) 2.0 m

3.0 m

(a)

(b)

OR (i) Draw ray diagrams to represent the nature, position and relative size of the image

formed by a convex lens for the object placed : (a) at 2 F1 (b) between F1 and 2F1 of lens.


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(ii) The image of a needle formed by a convex lens is obtained on the other side of the lens. If the image is three times the size of the needle and the distance between lens and image is 60 cm, at what distance should the needle be placed from the lens ? What is the nature of image ? Also calculate the focal length of the lens.

(i)

(a) 2F1 (b) F1 2F1

(b)

60 cm

SECTION - B /

26. The colour of a freshly prepared solution filled in a test tube is pale green. The solution could be of : (a) Zinc sulphate (b) Ferrous sulphate (c) Copper sulphate (d) Aluminium sulphate

(a) (b)

(c) (d)

27. A student put a strip of Zn, Fe and Cu in three test tubes containing freshly prepared solution

of aluminium sulphate. After about one hour he observed that : (a) each test tube becomes hot (b) a brown mass is deposited on the surface of each metal (c) the solution changes from colourless to light green (d) no change occurs

Zn, Fe Cu

(a)

(b)

(c)

(d)

28. A student adds a pinch of sodium hydrogen carbonate to acetic acid taken in a test tube and

makes the following observations. (A) A brisk effervescence is produced with the liberation of a colourless and odourless gas. (B) The gas extinguishes the burning splinter. (C) The gas burns with explosion when a burning candle is brought near it. (D) The gas turns the lime water milky. The observation which needs correction is. (a) A (b) B (c) C (d) D

(A)

(B)


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(C)

(D)

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

29. Four students observed the colour and odour of acetic acid and its reaction with sodium hydrogen carbonate. They tabulated their observation as given below.

Student Colour of acetic acid

Odour of acetic acid Action with sodium hydrogen carbonate

A B C D

colourless colourless colourles colourless

Fruity Smell of Vinegar

Odourless Smell of rotten egg

Gas evolves without bubbles Brisk effervescence

gas evolves without bubbles Brisk effervescence

The correct set of observation is that of student : (a) A (b) B (c) C (d) D

A

B

C

D

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

30. 5 mL of ethanoic acid was taken in two test tubes I and II each. Blue and red litmus paper were dipped into test tube I and solid sodium hydrogen carbonate was added to test tube II. The following observations were reported : (A) Red litmus turned blue in I and no change was observed in II. (B) Blue litmus turned red in I and brisk effervescence was observed in II. (C) Red litmus turned blue in I and a gas of odour like vinegar evolved in II. (D) Blue litmus turned red in I and a gas which supports combustion evolved in II. The observation which correctly represents the characteristics of ethanoic acid is : (a) A (b) B (c) C (d) D

I II 5 mL I

II

(A) I II

(B) I II

(C) I II

(D) I II

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


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31. The focal length of the concave mirror in the following experiment set up, shown below, is –

(a) 3.2 cm (b) 3.0 cm (c) 3.4 cm (d) 3.6 cm

(a) 3.2 cm (b) 3.0 cm (c) 3.4 cm (d) 3.6 cm

32. Ramesh obtained a sharp image of the grill of a window on a screen, using a convex lens. He

then thought of focusing a distant building instead of the grill. What should he do to obtain

clear image on screen ?

(a) keep lens behind the screen

(b) move lens towards the screen

(c) move lens away from the screen

(d) keep distance between lens and screen unchanged

(a)

(b)

(c)

(d)


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33. After performing the experiment to determine focal length of a concave mirror by focusing

distant object teacher asked four students A, B, C, D to describe the nature and size of the

image. The description given by them about the image

was –

(A) Virtual, inverted, smaller in size

(B) Real, inverted, smaller in size

(C) Virtual, erect, smaller in size

(D) Real, erect, larger in size

Correct description was given by –

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

A, B, C D

(A)

(B)

(C)

(D)

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

34. Four students, while doing experiment, on tracing the path of a ray of light passing through a

rectangular glass slab, measured the three angles marked as i, r and e in the figure. Which one

of the four conclusions is correct ?

(a) i > e (b) i > r (c) i < e (d) i r

i, r e


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(a) i > e (b) i > r (c) i < e (d) i r

35. In an experiment on tracing the path of a ray of light through a rectangular glass slab, four

students, A , B , C and D did the following to find emergent ray –

A : looked at heads of P1 and P2 while placing P3 and P4 and kept the eyes close to the glass

slab.

B : looked at heads of P1 and P2 while placing P3 and P4 and kept the eyes far from the glass

slab.

C : looked at feet of P1 and P2 while placing P3 and P4 and kept the eyes close to the glass

slab.

D : looked at feet of P1 and P2 while placing P3 and P4 and kept the eyes far from the glass

slab.

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

A, B, C, D

A : P3 P4 P1, P2


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B : P3 P4 P1, P2

C : P3 P4 P1, P2

D : P3 P4 P1, P2

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

36. From the following diagrams, select the correct sequence showing stages of binary fission in

amoeba.

(a) 3, 4, 2, 1 (b) 2, 4, 3, 1 (c) 2, 3, 4, 1 (d) 1, 3, 2, 4

(a) 3, 4, 2, 1 (b) 2, 4, 3, 1 (c) 2, 3, 4, 1 (d) 1, 3, 2, 4

37. The given slides „A‟ and „B‟ were identified by four students I, II, III, IV as stated

below :

Slide „A‟ Slide „B‟

(I) Binary fission in Amoeba Daughter cells of Amoeba

(II) Budding in yeast Buds of yeast

(III) Binary fission in Amoeba Buds of yeast

(IV) Budding in yeast Daughter cells in Amoeba

The correct identification has been made by the student :

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

„A‟ „B‟ I, II, III, IV

Slide „A‟ Slide „B‟

(I)


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(II)

(III)

(IV)

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

38. A pinch of yeast was added to a glucose solution and left overnight in a warm place. The next

day a drop of the suspension was observed on a slide under a microscope. The expected result would be shown by which of the following diagrams ?

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

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

39. The following sequence shows the stages in budding in yeast but this sequence is not correct

Correct sequence would be – (a) (i), (ii), (iii), (iv) (b) (iv), (iii), (ii), (i) (c) (iii), (ii), (iv), (i) (d) (i), (iii), (iv), (ii)


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

40. Different steps in the experiment, “to determine the percentage of water absorbed by raisins”,

are given below which may not be in proper sequence.

(1) Soak raisins for about an hour

(2) Weigh dry raisins

(3) Weigh soaked raisins

(4) Gently dry the raisins with the help of filter paper

The correct sequence of the steps is :

(a) 1, 2, 4, 3 (b) 2, 1, 4, 3 (c) 4, 3, 1, 2 (d) 4, 2, 1, 3

(1) 1

(2)

(3)

(4)

(a) 1, 2, 4, 3 (b) 2, 1, 4, 3 (c) 4, 3, 1, 2 (d) 4, 2, 1, 3

41. While performing an experiment with raisins, a student recorded the following data.

Mass of water taken in the beaker 50 g

Mass of raisins before soaking 20 g

Mass of raisins after soaking 30 g

Mass of water left in the beaker after soaking 40 g

The percentage of water absorbed by the raisins is :

(a) 50 30 g

10050 g

(b) 50 40 g

10050 g

(c) 30 20 g

10030 g

(d) 30 20 g

10020 g


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50 g

20 g

30 g

40 g

(a) 50 30 g

10050 g

(b) 50 40 g

10050 g

(c) 30 20 g

10030 g

(d) 30 20 g

10020 g

- o O o -


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