SUMMATIVE ASSESSMENT - I (2011)

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SUMMATIVE ASSESSMENT - I (2011)

Lakdfyr ijh{kk&I (2011)

SCIENCE / foKku

Class – X / & X

Time allowed : 3 hours Maximum Marks : 80 fu/kkZfjr le; % 3 ?k.Vs vf/kdre vad % 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 three questions

of five marks category. Only one option in such questions is to be attempted. iv). All questions to section A and all questions of section B are to be attempted separately. v). Questions 1 to 4 in section A are one mark questions. These are to be answered in one word or

one sentence. vi). Questions 5 to 13 in section A are two marks questions. These are to be answered in about 30

words each. vii). Questions 14 to 22 in section A are three marks questions. These are to be answered in about 50

words each. viii). Questions 23 to 25 in section A are five marks questions. These are to be answered in about 70

words each. ix). Questions 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.

lkekU; funsZ”k %

(i) bl iz”u i= dks nks Hkkxksa, Hkkx v vkSj Hkkx c esa ckaVk x;k gSA vkidks nksuksa Hkkxksa ds iz”uksa ds mRrj fy[kus gSaA

(ii) lHkh iz”u vfuok;Z gSaA

(iii) iwjs iz”u i= ij dksbZ p;u izkIr ugha gS ijUrq ikap&ikap vadks ds rhu iz”uksa esa Hkhrjh p;u fn;k x;k gSA bu iz”uksa esa vki

dsoy ,d Hkhrjh p;u dks mRrj fy[kus ds fy, pqu ldrs gSaA

(iv) vkidks Hkkx v vkSj Hkkx c ds lHkh iz”uksa ds mRrj i`Fkd&iFkd fy[kus gksaxsA

(v) Hkkx v ds iz”u la[;k 1 ls 4 ds iz”u ,d&,d vad ds gSaaA buds mRrj ,d “kCn vFkok ,d okD; esa nsaA

(vi) Hkkx v ds iz”u la[;k 5 ls 13 ds iz”u nks&nks vadksa ds gSaA buds mRrj yxHkx 30&30 “kCnksa esa nsus gSaA

(vii) Hkkx v ds iz”u la[;k 14 ls 22 ds iz”u rhu&rhu vadksa ds gSaA buds mRrj yxHkx 50&50 “kCnksa esa nsus gSaA

(viii) Hkkx v ds iz”u la[;k 23 ls 25 ds iz”u ikap&ikap vadksa ds gSaA buds mRrj yxHkx 70 “kCnksa esa nsus gSaA (ix) Hkkx c ds iz”u la[;k 26 ls 41 ds iz”u iz;ksxkRed dkS”ky ij vk/kkfjr cgqfodYih iz”u gSaA izR;sd iz”u ,d vad dk gSA

fn, x;s pkj fodYiksa esa ls vkidks dsoy ,d lcls mi;qDr fodYi pquuk gSA

SECTION-A / ' '

1. Write balanced equation for a chemical reaction that can be characterized as precipitation

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reaction as well as double displacement reaction.

2. Which gas is usually liberated when an acid reacts with a metal ?

3. Why is the box of a solar cooker covered with a glass plate ?

4. State the change in the ammeter reading observed when a resistance wire in a circuit is

replaced by a wire of same material and same length but comparatively double cross-

sectional area keeping the source of potential difference constant.

5.

Write chemical equations for the reactions taking place when

(i) zinc sulphide is heated in air

(ii) calcination of zinc carbonate is done.

(i)

(ii)

6. (a) Why does blue vitriol change to white on heating ?

(b) Write its formula.

(a)

(b)

7. Write an equation each for decomposition reaction when energy is supplied in the form of :

(i) heat and (ii) light.

(i) (ii)

8. What would you observe when zinc is added to a solution of iron sulphate ? Name the type




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of reaction and write the chemical equation.

9. State the function of the guard cells. What will happen to the guard cells and

stomatal pore when water flows to guard cells ?

10. There is an urgent need to harness non–conventional sources of energy. Explain.

11. A lamp rated 100 W at 220 V is connected to the mains electric supply. (i) What amount of

current is drawn from the supply line if the voltage is 220 V ? (ii) What is its resistance?

100 W; 220 V

(a) 220 V

(b)

12. A student performs an experiment to study the magnetic effect of current around a current

carrying straight conductor with the help of a magnetic compass. He reports that

(i) the degree of deflection of the magnetic compass increases when the compass is

moved away from the conductor.

(ii) the degree of deflection of the magnetic compass increases when the current

through the conductor is increased.

Which of the above observations of the student appears to be wrong and why ?

(i)

(ii)

13. What is an electric circuit ? Distinguish between an open and a closed circuit.




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14. Name the type of chemical reaction represented by the following equations :

(i) CaCO3 (s) CaO (s) + CO2 (g)

(ii) CaO (s) + H2O (l) Ca (OH)2 (aq)

(iii) Zn (s) + H2SO4 Zn SO4 (aq) + H2 (g)

(i) CaCO3 (s) CaO (s) + CO2 (g)

(ii) CaO (s) + H2O (l) Ca (OH)2 (aq)

(iii) Zn (s) + H2SO4 Zn SO4 (aq) + H2 (g)

15. What is Bleaching powder chemically called ? Give reaction involved in its preparation.

Give one of its uses.

16. (a) What is an alkali ? Give an example.

(b) Why do HCl, HNO3 etc show acidic characters in aqueous solutions while

solutions of compounds like alcohol and glucose do not show acidic character.

(a)

(b) HCl, HNO3

17. Which organ secrets a hormone when blood sugar rises in our body ? Name the hormone

and name one enzyme released by this organ.

18. What is chemotropism ? Give one example. Name any two plant hormones and

mention their functions.

19.

Name two types of energy obtained from oceans. Also write one limitation of harnessing

heat




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each of these.

20. What would be the reading of ammeter and voltmeter in the given circuit ?

21. Two conducting wires of same material, equal length and equal diameter are first connected

in series and then in parallel. Compare the equivalent resistance in two cases.

22. (a) State the law that helps to determine the direction of magnetic field around a straight

current carrying conductor. (b) Draw the magnetic field lines of the field produced due to a current carrying

circular loop.

(a)

(b)

23. (a) Name the main ore of mercury. How is mercury obtained from its ore ? Give balanced

chemical equations.

(b) What is thermit reaction ? How is it used to join the railway tracks or cracked machine parts ?

(c) Name the method used to extract metals of high reactivity.

(a)




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(b)

(c)

OR

(a) How is copper obtained from its sulphide ore ? Write balanced chemical equations.

(b) Give the electrolytic refining of impure copper with labelled diagram.

(a)

(b)

24. (a) How is separation of right side and left side of the heart useful in mammals and birds ?

(b) Some finger like projections are present in the inner wall of small intestine. Write their

name ? Why are they important ?

(a)

(b)

OR (a) What are the constituents of gastric juice ? Write any one function of each.

(b) What is the use of residual volume of air in lungs ?

(c) How are carbohydrates stored in the body of plants and animals ?

(a)

(b)

(c)

25. (a) When do we say that an electrical appliance is earthed ? Mention the function of earth

wire in electric lines. Why is it necessary to earth the electric appliances having

metallic body ?

(b) Explain what is short circuiting and overloading in an electric supply.

(a)

(b)

OR




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(a) State Flemings left hand rule with a labelled diagram.

(b) A coil of insulated copper wire is connected to a galvanometer. What happens if a bar

magnet is

(i) pushed into the coil ,

(ii) withdrawn from inside the coil ,

(iii) held stationary inside the coil ?

(a)

(b)

(i)

(ii)

(iii)

SECTION –B / ' '

26. Four solutions I, II III and IV were given to a student to test their acidic or basic nature by

using pH papers. He observed that the colour of pH paper turned to red, blue, green and

orange respectively when dipped in four solutions. The correct conclusion made by the

statement would be

(a) I, II and III are acidic.

(b) I and IV are acidic.

(c) II, III, and IV are acidic.

(d) II and IV are acidic.

I, II III IV pH

pH

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

(c) II, III IV (d) II IV

27. Two solutions A and B were found to have pH value of 6 and 8 respectively. The

inference which can be drawn is :




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(a) The stength of solution B is higher than that of A.

(b) A is an acid while B is base.

(c) both are acidic solutions.

(d) both are basic solutions.

A B pH 6 8

(a) B A

(b) A B

(c)

(d)

28. When a student added zinc granules to dilute HCl a colourless and odourless gas evolved.

On testing with a burning match stick it was observed that the match stick :

(a) continued to burn brilliantly.

(b) burnt slowly with a blue flame.

(c) extinguished and the gas burnt with pop sound.

(d) continued to burn brilliantly and the gas burnt with a pop sound.

HCl

(a)

(b)

(c)

(d)

29. Reddish brown deposit observed on iron nails, when these are kept in aqueous solution of

CuSO4 , is that of

(a) Cu2O (b) CuO (c) Cu (d) CuS

CuSO4




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(a) Cu2O (b) CuO (c) Cu (d) CuS

30. Rahul adds aqueous solution of barium chloride to an aqueous solution of sodium sulphate.

He would observe that

(a) a pungent smelling gas is evolved.

(b) the colour of the solution turns red.

(c) a yellow precipitate is formed after sometime.

(d) a white precipitate is formed almost immediately.

(a)

(b)

(c)

(d)

31. For the circuits shown in figure I and II the ammeter readings would be :

(a) 1A in circuit I and 0A in circuit II

(b) 0A in both circuits

(c) 1A in both circuits

(d) 0A in circuit I and 1A in circuit II

I II




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(a) I 1A II 0A (b) 0A

(c) IA (d) I 0A II IA

32. Which of the following experimental set up is correct for verification of Ohm’s

law ?

(a) A (b) B

(c) both A and B (d) Neither A nor B

(a) A (b) B




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(c) A B (d) A B

33. The current flowing through a conductor and the potential difference across its two ends are

as per readings of the ammeter and the voltmeter shown below.

The resistance of the conductor would be :

(a) 0.15 (b) 1.5 (c) 15.0 (d) 150.0

(a) 0.15 (b) 1.5 (c) 15.0 (d) 150.0

34. To determine the equivalent resistance of three resistors arranged in parallel four students

connected the resistors as shown in figures A, B, C and D.




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The correct set up is that of student :

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

A, B, C D

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

35. The following instruments are available in a laboratory :

Milliammeter A1 : range 0-300 mA and least count 10 mA

Milliammeter A2 : range 0-200 mA and least count 20 mA

Voltmeter V1 : range 0-5 V and least count 0.2 V

Voltmeter V2 : range 0-3 V and least count 0.3 V

Out of the above instruments, which pair of milliammeter and voltmeter would be the

best choice to determine the equivalent resistance of two resistors connected in series ?

(a) Milliammeter A1 and Voltmeter V1

(b) Milliammeter A2 and Voltmeter V2

(c) Milliammeter A1 and Voltmeter V2

(d) Milliammeter A2 and Voltmeter V1




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A1 : 0-300 mA 10 mA

A2 : 0-200 mA 20 mA

V1 : 0-5 V 0.2 V

V2 0-3 V 0.3 V

(a) A1 V1

(b) A2 V2

(c) A1 V2

(d) A2 V1

36. In an experiment on photosynthesis students were instructed to cover a portion of a leaf of a

destarched potted plant with opaque paper as shown :

“A” covered one of the leaves with red strip, “B” with green, “C” with blue, “D” with black.

When the starch test was done on the leaves after 4 hours, the result showed no starch in :

(a) the portion covered with red, green & blue strips

(b) the portion covered with green strips

(c) the portion covered with black and blue strips

(d) any of the covered portions




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“A” “B” “C” “D”

(a)

(b)

(c)

(d)

37. The figure that correctly depicts the removal of chlorophyll is :

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

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

38. When an epidermal of a leaf is observed through a high powered microscope, it shows that

each stomata is surrounded by

(a) many guard cells. (b) a pair of guard cells.

(c) a single guard cell. (d) a pair of epidermal cells.




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(a)

(b)

(c)

(d)

39.

In the following diagram of the stomatal apparatus, which parts are correctly labelled ?

(a) (i) and (v) (b) (ii) and (v) (c) (iv) and (ii) (d) (v) and (iv)

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

40. Observe the following set up and choose the right reason as to why water has not risen in the

delivery tube.

(a) The set up is airtight.

(b) Beaker has coloured water.

(c) CO2 is not being absorbed

(d) O2 is not available to seeds for respiration




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(a)

(b)

(c) CO2

(d) O2

41. The correct set of three precautions for setting up the experiment to demonstrate that

CO2 is evolved during respiration is :

(a) Thread holding KOH test tube, Airtight flask, delivery tube above water surface

in the beaker

(b) Flask has just germinated seeds, Airtight set up, delivery tube dip in water in

beaker.

(c) Flask has seeds covered with water, Airtight set up, KOH test tube held by a thick

wire.

(d) Just germinated seeds under water in the flask, delivery tube above water level, Thread

holding KOH test tube.

CO2

(a) KOH

(b)

(c) KOH

(d) KOH




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SUMMATIVE ASSESSMENT - I (2011)