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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 five 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 ikWap 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. Balance the following chemical equation :

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FeSO4 (s) heat

Fe2O3 (s) SO2 (g)SO3 (g)

FeSO4 (s) Fe2O3 (s) SO2 (g)SO3 (g)

2. Give an example of a metal which is the best conductor of heat.

3. Name the agent which decomposes animal dung into biogas.

4. Name the physical quantity whose unit is volt/ampere.

5. “All ores are minerals but all mineral are not ores”. Justify the statement with examples.

6. A white powder is added while baking breads and cakes to make them soft and fluffy.

What is the name of the powder ? What are the main ingredients in it ? What are the

functions of each ingredient ?

7. A light sensitive compound „X‟ of silver is used in black and white photography. On exposure

to sunlight its colour changes to gray :

(a) Identify „X‟

(b) Write a chemical equation to express the above change

(c) Identify the type of chemical reaction.

„X‟

(a) „X‟

(b)

(c)

8. A white compound on heating decomposes to give brown fumes and a yellow residue is left

behind. Name the compound. Write the chemical equation of the reaction stating its type.




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9. Name the material transported by the following :-

(i) Xylem (ii) pulmonary artery

(iii) pulmonary Vein (iv) phloem

(i) (ii)

(iii) (iv)

10. Mention the main use of the slurry left behind in the bio-gas of plant. State the characteristics of

the slurry on which this use is based.

11. Define 1 kWh. How is this unit of energy related to 1 joule ?

1 kWh 1

12. An electron enters a magnetic field at right angles to it, as shown

What will be the direction of force acting on the electron ? State the rule used to find the

direction of this force.

13. Calculate the resistance of a wire, when a potential difference of 2 V is maintained for 1A




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current to flow through it.

1A 2V

14. A brown substance „X‟ on heating in air forms a substance „Y‟. When hydrogen gas is

passed over heated „Y‟, it again changes back into „X‟.

(i) Name the substance X and Y.

(ii) Name the type of chemical reactions occurring during both the changes.

(iii) Write the chemical equations of the reactions.

„X‟ „Y‟ „Y‟

„X‟

(i) X Y

(ii)

(iii)

15. The products obtained on electrolysis of concentrated aqueous solution of a substance „X‟ are

NaOH, Cl2 and H2.

(a) Name the substance „X‟.

(b) What is the special name of this process and why ?

(c) Which gas is liberated at anode ?

(d) List one commercial use of NaOH.

„X‟ NaOH, Cl2 H2

(a) „X‟

(b)

(c)

(d) NaOH

16. (a) Equal lengths of Mg ribbon are taken in test tubes A and B. Hydrochloric acid is added to

test tube A. While acetic acid is added to test tube B. In which case the reaction would

occur more vigorously and why ? Write the chemical equations for reactions in test tube

A and B.

(b) Fresh milk has a pH of 6. How will the pH change as it turns into curd ? Give reason for




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your answer.

(a) A B A

B

A B

(b) pH 6 pH

17. Define hormones. Name the hormone secreted by thyroid. Write its function.

18. What is reflex arc ? Draw diagram of reflex arc. Label on it the following :

(i) Sensory neuron (ii) Motor neuron

(i) (ii)

19. List any three limitations in harnessing wind energy.

20. The following circuit diagram shows the combination of three resistors R1, R2 and R3. Find

(i) total resistance of the circuit,

(ii) total current (I) flowing in the circuit and the

(iii) potential difference across R1.

R1, R2 R3

(i)

(ii) (I)




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(iii) R1

21. Two identical immersion heaters are to be used to heat water, in a large container. Which one of

the following arrangement would heat the water faster :

(i) connecting the heaters in series with the main supply,

(ii) connecting the heaters in parallel with the main supply ?

Give reasons for your answer.

(i)

(ii)

22. With the help of a diagram describe an experiment to show that a change in current flowing

through a coil induces an electric current in a neighbouring coil.

23. (a) The reaction of metal X with ferric oxide is highly exothermic. Metal X is obtained from

its oxides by electrolytic reduction. Identify X and write its reaction with ferric oxide.

(b) Give reason to justify that aluminium oxide is an amphoteric oxide. Also give another

example of amphoteric oxide.

(c) Mention constituent metals present in bronze.

(a) X X

X

(b)




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(c)

OR (a) Explain with an example how the metal X which is low in reactivity series and metal Y

which is high in the reactivity series are obtained from their compounds by reduction

process.

(b) Write the electronic configurations of sodium and chlorine. Show the formation of sodium

chloride from sodium and chlorine by the transfer of electrons.

(c) List any two observations when a highly reactive metal is dropped in water.

(a) X Y

(b)

(c)

24. (a) Draw a labelled diagram of sectional view of human heart.

(b) Describe double circulation in human beings. Why is it necessary ?

(a)

(b)

OR

(a) Draw a diagram of excretory system in human beings and label the following

(i) left kidney (ii) vena cava

(iii) urinary bladder (iv) urethra

(b) Write two major components of human urine.

(a)

(i) (ii)

(iii) (iv)

(b)

25. (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 ,




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(ii) withdrawn from inside the coil ,

(iii) held stationary inside the coil ?

(a)

(b)

(i)

(ii)

(iii)

OR (a) When do we state 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)

SECTION –B / ' '

26. Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip :

(a) turned blue (b) did not change

(c) turned green and suddenly yellow (d) turned light pink

pH

(a) (b)

(c) (d)

27. Four solutions A,B,C and D were given to a student to test their acidic or basic nature by using

a pH paper. 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 student would

be that :

(a) A, B and C are acidic (b) A and D are acidic

(c) B, C and D are basic (d) B and D are basic




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A, B, C, D pH

pH

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

(c) B,C D (d) B D

28. Four students performed the reactions of dil hydrochloric acid and a solution of sodium

hydroxide with zinc metal and solid sodium carbonate separately. They reported the possible

reaction by () and no reaction by (X). In which of the following sets all observations are

correct ?

()

()

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

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

30. (i) Parallel combination of resistors R1 and R2 and that of R3, R4 and R5 are connected to a

battery of 12 V, an ammeter and plug key as shown in the circuit diagram. If R110 ,

Set HCl + Zn HCl + Na2CO3 NaOH + Zn NaOH + Na2 CO3

(a)

(b)

(c)

(d)

Set HCl + Zn HCl + Na2CO3 NaOH + Zn NaOH + Na2 CO3

(a)

(b)

(c)

(d)




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R240 , R330 , R420 , and R560 calculate :

(a) The total resistance in the circuit.

(b) The total current flowing in the circuit.

(i) R1 R2 R3, R4 R5 12 V

R110 , R240 , R330 , R420 , R560

(a)

(b)

31. Using the following measuring instruments, the best pair made for carrying out

experiment to determine resistance of a resistor of nearly 30 is :

Milliammeter (A1) : Range 0 - 100 mA, Least count 20 mA.

Milliammeter (A2) : Range 0 - 500 mA, Least count 5 mA.

Voltmeter (V1) : Range 0 - 3 V and Least count 0.05 V.




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Voltmeter (V2) : Range 0 - 2 V, and Least count 0.04 V.

(a) A1 and V1 (b) A1 and V2 (c) A2 and V2 (d) A2 and V1

30

(A1) : 0 – 100 mA 20 mA.

(A2) : 0 – 500 mA 5 mA.

(V1) : 0 – 3 V 0.05 V.

(V2) : 0 – 2 V 0.04 V.

(a) A1 V1 (b) A1 V2 (c) A2 V2 (d) A2 V1

32. In a milliammeter, there are 20 divisions between 400 mA mark and 500 mA mark. The

least count of the milliammeter is.

(a) 0.5 mA (b) 5 mA (c) 10 mA (d) 50 mA.

400 mA 500 mA 20

(a) 0.5 mA (b) 5 mA (c) 10 mA (d) 50 mA

33. Which of the following devices would you use to maintain potential difference between

two points of a conductor ?

(a) A rheostat (b) A cell

(c) A voltmeter (d) An ammeter

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

34. In the experiment on finding the equivalent resistance of two resistors connected in

parallel three students connected the voltmeter in their circuits in three different ways X, Y

and Z shown here :




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The voltmeter has been correctly connected in

(a) cases X and Y only (b) cases Y and Z only

(c) cases Z and X only (d) all the three cases

X, Y, Z

(a) X Y (b) Y Z

(c) Z X (d)

35. The only correct statement for the two circuits (X) and (Y) shown below is :

( X ) ( Y )

(a) The resistors R1 and R2 have been connected in series in both the circuits.




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(b) The resistors R1 and R2 have been connected in parallels in both the circuits.

(c) In the circuit (X) the resistors R1 and R2 are connected in parallel whereas these are

connected in series in circuit (Y)

(d) In the circuit (X) the resistors R1 and R2 are connected in series whereas these are connected

in parallel in circuit (Y).

(X) (Y)

( X ) ( Y )

(a) R1 R2

(b) R1 R2

(c) R1 R2 X Y

(d) R1 R2 X Y

36. Given below is a sketch of a leaf of a potted plant which is partially covered with black paper

and is to be used in the experiment to show that light is necessary for the process of

photosynthesis. At the end of the experiment which one of the leaf parts labelled I, II and III will

become blue black when dipped in iodine solution ?

(a) I and II (b) II only (c) I and III (d) II and III

I,




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II III

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

37. A black strip of paper was clipped on to a destarched leaf in a potted plant to cover a part of

the leaf. The plant was then exposed to sunlight for four hours, the paper strip was removed

and the leaf tested for starch. When iodine solution was added :

(a) the entire leaf turned blue - black

(b) the covered part of the leaf became blue - black

(c) the uncovered part of the leaf became blue - black.

(d) the colour of iodine solution remained unchanged

(a)

(b)

(c)

(d)

38. Temporary mount of a peel is made in :

(a) Alcohol (b) Water

(c) Glycerine (d) Acetone

(a) (b)

(c) (d)




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39. When a student observed a stomatal epidermal peel under the microscope, it appeared pinkish

red. The stain used was :

(a) Iodine (b) Methyl orange

(c) Safranin (d) Methylene blue

(a) (b)

(c) (d)

40. A student has drawn the figure to show the observed condition at the end of performing the

experiment to show that germinating seeds give out CO2 during respiration. Choose the correct

diagram.

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

CO2




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

41. Using the same number of given germinating seeds, two students A and B set up the experiment

separately. Student A used a cotton plug to hold the bent tube to the mouth of the flask.

Student B used air tight rubber cork.

Which one of the following is to be observed after a few hours ?

(a) Water level would rise in the bent tube of A.

(b) Water level would rise in the bent tube of B.

(c) The cotton plug would become wet.

(d) The water in the beaker of B would turn milky.

A B A

B




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(a) A

(b) B

(c)

(d)




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