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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. Write a balanced chemical equation for a chemical combination reaction.

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2. Why is carbon not used for reducing aluminium from aluminium oxide ?

3. Suggest any two reasons which make the large scale usage of nuclear energy prohibitive.

4. The voltage - current (V-I) graph of a metallic conductor at two different temperature T1 and

T2 is shown below. At which temperature is the resistance higher ?

T1 T2 (V–I)

5. Give observation and write chemical equation for reaction of sodium with water.

6. A knife, which is used to cut a fruit, was immediately dipped into water containing drops of

blue litmus solution. If the colour of the solution is changed to red, what inference can be

drawn about the nature of the fruit and why ?

7. What happens in a displacement reaction. Justify your answer giving one example.

8. What would you observe when.




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(i) calcium oxide is added to water ?

(ii) barium chloride solution is added to sodium sulphate solution ?

Write the reaction involved in each case.

(i)

(ii)

9. What is excretion ? How do unicellular organisms remove their wastes ?

10. Name the major constituent of biogas. List three characteristics to prove it as an excellent

fuel.

11. In the circuit diagram shown, the two resistance wires A and B are of same area of cross

section and same material, but A is longer than B. Which ammeter A1 or A2 will indicate

higher reading for current? Give reason.

A B

A B A1 A2




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12. A student while studying the force experienced by a current carrying conductor in a magnetic field records the following observations (i) The force experienced by the conductor increases as the current is increased (ii) The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observations is correct and why ?

(i)

(ii)

13. How would the reading of voltmeter (V) change if it is connected between B and C ? Justify

your answer.

(V) B C

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)

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

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

heat




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

15. (a) Give the chemical names of acids present in

(i) ants (ii) lemon

(iii) milk (iv) tomato

(b) Write the chemical names of two salts belonging to sodium family.

(a)

(i) (ii)

(iii) (iv)

(b)

16. (a) How is common salt prepared from sea water?

(b) What will be the approximate pH of the aqueous solutions of the following salts :

(i) Sodium chloride

(ii) Ammonium Chloride

(a)

(b) pH

(i)

(ii)

17.

Draw the diagram shown here and label on it the position of motor neuron, relay neuron and




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spinal cord. With which name is the connection between these three known ?

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)

19. Biomass has been used as fuel since ancient times, how has it been modified to function as a more efficient fuel in the recent past ?

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




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

22. What change in the deflection of the compass needle placed at a point near current carrying

straight conductor shall be observed If the -

(a) current through the conductor is increased,

(b) direction of current in the conductor is reversed?

(c) compass is moved away from the conductor?

(a)

(b)

(c)

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)

(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. (i) Leaves of a healthy potted plant were coated with vaseline to block the stomata. Will

this plant remain healthy for long ? State three reasons for your answer.




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(ii) State any two differences between autotrophic nutrition and hetrotrophic nutrition.

(i)

(ii)

OR (A) Draw a sectional view of the human heart and label on it the following parts :

(i) Aorta (ii) Pulmonary arteries

(iii) Vena cava from upper body (iv) Left ventricle

(B) Why is double circulation of blood necessary in human beings ?

(A)

(i) (ii)

(iii) (iv)

(B)

25. What are magnetic field lines ? List any two characteristics of field lines. Draw the pattern

of magnetic field of lines due to a current carrying circular loop.

OR (a) Draw a schematic diagram showing common domestic circuit.

(b) State the function of an earth wire ? Why is it necessary to earth metallic appliances

such as an electric iron?

(a)

(b)

SECTION –B / ' '

26. The pH value of a solution is 6. What is the colour developed when a student adds 3

drops of universal indicator in the solution

(a) Red (b) Blue (c) Green (d) Orange

pH 6




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

27. A few drops of liquid ‘X’ were added to distilled water. It was observed that pH of the water

is increased. The liquid ‘X’ could be

(a) lemon juice. (b) NaCl solution.

(c) Na2CO3 solution. (d) dilute HCl.

‘X’ pH

‘X’

(a) (b) NaCl

(c) Na2CO3 (d) HCl

28. Prachi added dil. HCl to a test tube containing zinc granules and noted the following

observations :

(i) The zinc surface became dull and black.

(ii) A gas evolved which burnt with a pop sound.

(iii) The solution remained colourless.

The observations found correct are

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

HCl

(i)

(ii)

(iii)

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

29. To show that iron is more reactive than copper, the correct procedure is to :

(a) prepare ferrous sulphate solution and dip copper strip in it.

(b) prepare copper sulphate solution and dip iron strip in it.

(c) add dil. nitric–acid on both strips.

(d) heat iron and copper strips both.




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(a)

(b)

(c)

(d)

30. The colour of ferrous sulphate crystals is :

(a) Blue (b) Yellow (c) Green (d) Brown

(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. The readings of current flowing through a conductor and the potential difference across its

two ends are shown in the ammeter and voltmeter given below.

The resistance of the conductor would be

(a) 20 (b) 5.0 (c) 2.0 (d) 0.2

(a) 20 (b) 5.0 (c) 2.0 (d) 0.2

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

law ?




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(a) A (b) B

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

(a) A (b) B

(c) A B (d) A B

34. Two students are using the circuits shown here. They are doing the experiment to find the

equivalent resistance of a :

(a) series combination and a parallel combination respectively of the two given

resistors.

(b) parallel combination and a series combination respectively of the two given

resistors.




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(c) series combination of the two given resistors in both the cases.

(d) parallel combination of the two given resistors in both the cases.

(a)

(b)

(c)

(d)

35. The resistors R1 and R2 are connected in

( I ) ( II )

(a) parallel in both circuits.

(b) series in both circuits.

(c) parallel in circuit I and in series in circuit II.

(d) series in circuit I and in parallel in circuit II.

R1 R2




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( I ) ( II )

(a)

(b)

(c) I II

(d) I II

36. A leaf is boiled in alcohol before using iodine for a starch test in order to

(a) dissolve starch

(b) dissolve chlorophyll

(c) soften the leaf

(d) make it react with iodine

(a) (b)

(c) (d)

37. A student performed starch test on a leaf. Four steps involved in the test are shown below :

The correct sequence of steps should be

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




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

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

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

38. The stain used in the preparation of temporary mount of a leaf peel to observe stomata is :

(a) safranin (b) methylene blue

(c) glycerin (d) iodine solution

(a) (b)

(c) (d)

39. Diagram showing a microscopic view of epidermal tissue

(a) is correct in all aspects.

(b) is wrong because stoma is not shown.

(c) is wrong because the guard cells are directed backwards.




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(d) is correct because two guard cells and stomata are present.

(a)

(b)

(c)

(d)

40. 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

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




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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

(a)

(b)

(c) CO2

(d) O2




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