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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 / ' '

570023

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1. Why are decomposition reactions called the opposite of combination reactions ?

2. In the formation of a compound XY, atom ‘X’ gives one electron to an atom of ‘Y’. What is the

nature of bond in XY ?

XY ‘X’ ‘Y’ XY

3. What is tidal energy ?

4. What is commercial unit of energy ?

5. Write the equations for the following metals which are obtained from their compounds by

reduction process.

(a) Metal X which is low in reactivity series.

(b) Metal Y which is in middle of series.

(a) X

(b) Y

6. Name the gas evolved when sodium hydrogen carbonate is made to react with

dilute hydrochloric acid. How will you test the gas ?

7. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white

substance is formed. Write the chemical reaction involved and also mention the type of the

chemical reaction.

8. A substance X, which is an oxide of a metal is used intensively in the cement industry. This

element is present in bones also. On treatment with water it forms a solution which turns red

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litmus blue. Identify X and also write the equation for its chemical reactions with water.

X

X

9. Give reasons for the following :

(a) Why is diffusion is not sufficient to meet the oxygen requirements of all the cells in

multicellular organisms ?

(b) How desert plants perform photosynthesis if their stomata remain closed during the day ?

(a)

(b)

10. What are renewable sources of energy? Give two example.

11. How many 40 W bulbs can be safely connected in a parallel circuit which is drawing current

through a 5A fuse from a 220 V supply ?

220V 5A 40 W

12. How does the strength of the Magnetic field at the centre of a circular coil of a wire depend on :

(a) radius of the coil (b) number of turns in the coil

(a) (b)

13. Calculate the resistance of a conductor when the current flowing through it is 0.2 A and the

potential difference is 0.8 V ?

0.2 A

0.8 V

14. (a) Give an example of a combination reaction which is also an exothermic reaction.

(b) Complete the following chemical equation and balance it.

C6H12O6O2

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(c) Which two gases are evolved on heating ferrous sulphate.

(a)

(b)

C6H12O6O2

(c)

15. (i) What change will you observe in the colour of red litmus paper when it is dipped

into a solution of sodium sulphate ? Give reason to explain your observation.

(ii) A bottle filled with concentrated sulphuric acid upto brim is left open in the

atmosphere by mistake. Will there be any change in the level of liquid ? Explain

your answer with reason.

(i)

(ii)

16. Write the chemical formula of washing soda and baking soda. Which of these two is an

ingredient of antacids ? How do antacids provide relief in stomach ache ?

17. (a) Why should we use iodised salt in our diet ?

(b) If iodine is insufficient in one’s diet, what might be the deficiency disease ?

(a)

(b)

18. (a) Explain how auxins help in bending of plant stem towards light.

(b) State the objective of the experiment for which experimental set up is shown in the given

diagram.

(a)

(b)

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19. List two practical uses of biogas in rural areas.

20. A wire of length l and area of cross-section A was drawn into a wire of double its length by

melting it. If its original resistivity and resistance were and R respectively, what will be its

new resistivity and resistance ?

l A

R

21. An electric lamp of resistance 20 and a resistor of 4 are connected to a 6V battery as shown

in the circuit diagram.

Calculate -

(a) total resistance of the circuit,

(b) current through the circuit, and

(c) potential difference across the electric lamp and the resistor.

20 4

6 V

(a)

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(b)

(c)

22. (a) What is the function of an earth wire ? Why is it necessary to earth metallic

appliances ?

(b) What is the difference between overloading and short circuiting ?

(a)

(b)

23. What are alloys ? How are they made ? Name the constituents and uses of Brass, Bronze and

Solder.

OR In what forms are the metals found in nature ? With the help of examples explain how metals

react with oxygen, water and dilute acids. Also write chemical equations for the reactions.

24. (a) Draw a sectional view of human heart and label, on it : (i) Aorta (ii) Right ventricle and (iii)

Pulmonary veins.

(b) State the role and functions of : (i) blood and (ii) lymph in human transport system.

(a)

(i) (ii) (iii)

(b) (i) (ii)

OR (a) Write two differences between autotrophic and heterotrophic nutrition.

(b) Draw a diagram showing cross - section of a leaf and label on it

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(i) Phloem (ii) Xylem (iii) Vascular bundle and (iv) Lamina.

(a)

(b)

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

25. (a) Explain an activity to show that a current carrying conductor experiences a force

when placed in a magnetic field.

(b) State the rule which gives the direction of force acting on the conductor.

(c) An electron moves perpendicular to a magnetic field as shown in the figure. What

would be the direction of force experienced on the electron ?

(a)

(b)

(c)

OR (a) With the help of a labelled diagram, explain the distribution of magnetic field due to

a current through a circular loop.

(b) What is a solenoid ?

(c) Draw the pattern of magnetic field formed around a current carrying solenoid.

Compare this field to that of a bar magnet.

(a)

(b)

(c)

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SECTION –B / ' '

26. A colourless sample was tested with a strip of pH paper. The colour of the strip changed

to green. The sample should be :

(a) tap water (b) distilled water

(c) sodium hydroxide (d) lemon juice

pH

(a) (b)

(c) (d)

27. Solid sodium bicarbonate was placed on a strip of pH paper. What change will happen to

the colour of the strip ?

(a) Turned blue (b) Did not change

(c) Turned green (d) Turned light pink

pH

(a) (b)

(c) (d)

28. Given below are certain chemical properties of substances

(I) It turns blue litmus red.

(II) It turns red litmus blue.

(III) It reacts with zinc and a gas evolves.

(IV) It reacts with solid sodium carbonate to give brisk effervescence.

Which out of these properties are shown by dilute hydrochloric acid

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

(c) I, III and IV only (d) II, III and IV only

(I)

(II)

(III)

(IV)

(a) I II (b) I III

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

29.

Iron filings were added to a solution of copper sulphate. After 10 minutes, it was

observed that the blue colour of the solution has changed and a layer has deposited

on iron filings. Which one of the following set of colours correspond to the colour of

the solution and the colour of the coating respectively ?

(a) Yellow and green.

(b) Brown and blue.

(c) Red and greenish blue.

(d) Light green and reddish brown.

10

(a) (b)

(c) (d)

30. A student took solid quicklime in a china dish and added a small amount of water to it. He

would hear a :

(a) pop sound (b) a crackling sound

(c) a hissing sound (d) no sound at all.

(a) (b)

(c) (d)

31. An ammeter has a range of (0-3) amperes and there are 30 divisions on its scale. What is its

least count?

(a) 1.0 A (b) 0.001 A (c) 0.1 A (d) 0.01 A

0-3 A 30

(a) 1.0 A (b) 0.001 A (c) 0.1 A (d) 0.01 A

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

per the readings on the ammeter and voltmeter below. The resistance of the conductor would

be :

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(a) 0.02 ohm (b) 15 ohm (c) 20 ohm (d) 24 ohm

(a) 0.02 (b) 15 (c) 20 (d) 24

33. 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

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 :

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

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(c) Z X (d)

35. In the experiment on finding equivalent resistance of two resistors, connected in series, four

students I, II, III and IV set up the circuit as shown below :

The correct connections have been made by student

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

I, II, III IV

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

36. In an experiment on photosynthesis, a student fixed a strip of black paper on the dorsal surface

of a destarched leaf in the morning. In the evening she tested the leaf for starch. Which of the

following she is likely to observe ?

(a) The dorsal surface of the leaf will appear white while the ventral surface would turn

blue.

(b) Both the surfaces of the leaf would appear white.

(c) The entire leaf would turn blue black.

(d) The dorsal surface would turn blue while ventral surface would appear white.

(a)

(b)

(c)

(d)

37. Figures A, B, C and D show leaves that has been boiled in alcohol, placed in four beakers

containing liquids as labelled.

(A) (B) (C) (D)

In which one of the above a positive test for presence of starch would be obtained ?

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

A, B, C D

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(A) (B) (C) (D)

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

38. A group of students prepared epidermal leaf peel and observed it under microscope. The

following sketches were drawn. Which of the following diagram is correct?

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

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

39. An epidermal peel of a leaf was observed by four students A, B, C and D under the high power

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of a microscope, the following sketches were made by them. Identify the correct sketch

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

A, B, C D

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

40. Before setting up an experiment to show that seeds release CO2 during respiration, the

seeds should be :

(a) dried completely. (b) boiled to make them soft.

(c) soaked in vinegar. (d) kept moist till they germinate.

CO2

(a) (b)

(c) (d)

41. In the experiment to show that CO2 is given out during respiration. It is observed that

water rises in the bent tube. This happens because of the low pressure created in the flask

due to which of the following ?

(a) Seeds use CO2 during respiration.

(b) Germinating seeds develop suction force

(c) Germinating seeds use up the O2 present in the conical flask and give out CO2

which is absorbed by KOH.

(d) Seeds give out oxygen during respiration.

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CO2

(a) CO2

(b)

(c) O2 CO2 KOH

(d)