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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 to represent the following reaction. Aluminium reacts

570008

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with copper chloride to give aluminium chloride and copper.

2. Give an example of a metal which can be easily cut with a knife.

3. What type of reflector is usually used in box type solar cooker ?

4. What happens to the resistance of a conductor when the length is reduced to half ? Justify

your answer.

5. What are the products formed when magnesium metal reacts with water ? Why do the

pieces of metal start floating during the reaction ?

6. Write the balanced chemical equations for the following reactions :

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations

gives sodium chloride and sodium hydrogen carbonate.

(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride,

water and liberates carbon dioxide.

(a)

(b)

7.

When a solution of potassium iodide is added to a solution of lead nitrate in a test tube,

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a reaction takes place.

(a) What type of reaction is this ?

(b) Write a balanced chemical equation to represent the above reaction.

(a)

(b)

8. Define combination reaction. Give one example of a combination reaction which is also

exothermic.

9. Write two points of difference between aerobic and anaerobic respiration .

10. What is geothermal energy ? How can this energy be used to generate electricity ?

11. Calculate the number of electrons that will constitute a flow of charge of 4C.

(Charge of 1 electron1.61019 C)

4 C (

1.61019 C)

12. What is meant by the term magnetic field lines ? List any two properties of magnetic

field lines.

13. A wire is cut into three equal parts and then connected in parallel. How will this alteration

effect its :

(a) resistance (b) resistivity ?

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(a) (b)

14. (a) Classify the following reactions into different types

(i) AgNO3 (aq)NaCl(aq) AgCl(s)NaNO3(aq)

(ii) CaO(s)H2O Ca(OH)2

(iii) 2KClO3 (s)

2KCl3O2

(b) Which of the above reaction(s) is/are precipitation reaction(s) ? Why is a reaction called precipitation reaction ?

(i) AgNO3 (aq)NaCl(aq) AgCl(s)NaNO3(aq)

(ii) CaO(s)H2O Ca(OH)2

(iii) 2KClO3 (s)

2KCl3O2

/

15. A milkman adds a very small amount of baking soda to fresh milk.

(i) What is the effect of addition of baking soda to milk ?

(ii) Why does this milk take long time to set as curd ?

(i)

(ii)

16. (i) Name the compound which is obtained from baking soda and is used to remove

permanent hardness of water.

(ii) Write its chemical formula.

(iii) What happens when it is recrystallised from its aqueous solution ?

(i)

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(ii)

(iii)

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. (a) Define tropic movement.

(b) Why do multicellular organisms need another means of communication between cells

besides nervous co-ordination ?

(a)

(b)

19. State three advantages of using solar cells to produce electricity. Why is their use for

domestic purposes limited ?

20. (a) Calculate the current drawn by an electric bulb from a 220V source if the resistance of

bulb filament is 1200.

(b) Calculate the current drawn by electric heater from a 220V source if the resistance of

the heater is 100.

(a) 1200 220V

(b) 100 220V

21. Find out the following in the electric circuit given in Figure.

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(a) Potential difference across 4 resistance.

(b) Power dissipated in 4 resistor.

(c) Difference in ammeter readings, if any, of A1 and A2.

(a) 4

(b) 4

(c) A1 A2

22. What are the advantages of connecting different electrical appliances in parallel ?

Mention any three advantages.

23. (a) How is copper obtained from its ore ? Write equations.

(b) How is impure copper refined by electrolytic refining ? Draw diagram and write

reactions at cathode and anode.

(a)

(b)

OR

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Write balanced chemical equation for the reactions taking place when

(i) zinc carbonate is calcinated.

(ii) zinc sulphide is roasted.

(iii) zinc oxide is reduced to zinc.

(iv) cinnabar is heated in air.

(v) manganese dioxide is heated with aluminium powder.

(i)

(ii)

(iii)

(iv)

(v)

24. (a) Explain in brief the mechanism of circulation of blood in the human body.

(b) “Lymph is another type of fluid involved in transportation.” Justify this statement by

explaining the process.

(a)

(b)

OR (a) Explain the excretory system in Human beings.

(b) List any four strategies used by plants for excretion ?

(a)

(b)

25. (a) Two circular coils A and B are placed closed to each other. If the current in the

coil A is changed, will some current be induced in coil B? Give reason.

(b) State the rule to determine the direction of a :

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(i) magnetic field produced around a straight conductor carrying

current.

(ii) force experienced by a current carrying straight conductor placed in a

magnetic field, which is perpendicular to it.

(a) A B A

B

(b)

(i)

(ii)

OR (a) When is the force experienced by a current carrying conductor placed in a

magnetic field largest ?

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

appen 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. When a student dipped pH paper in the given solution, he found green colour. The given

solution may be

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(a) NaOH solution (b) NaCl solution

(c) dilute HCl (d) Na2 CO3 solution

pH

(a) NaOH (b) NaCl

(c) HCl (d) Na2 CO3

27. The correct method of finding the pH of a solution is to :

(a) heat the solution in a test tube and expose the pH paper to the vapours formed.

(b) pour the solution on the pH paper.

(c) dip the pH paper in the solution.

(d) put a drop of the solution on the pH paper using a dropper.

pH

(a) pH

(b) pH

(c) pH

(d) pH

28. Colourless and odourless gas is liberated when hydrochloric acid is added to a solution

of washing soda. The name of the gas is :

(a) Carbon dioxide.

(b) Nitrogen dioxide.

(c) Sulphur dioxide.

(d) Sulphur trioxide.

(a) (b)

(c) (d)

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29. When crystals of FeSO4 are strongly heated the residue obtained is

(a) red in colour. (b) blue in colour.

(c) green in colour. (d) colourless.

FeSO4

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

30. The colour of metal deposited when iron nails are dipped in aqueous solution of copper

sulphate is :

(a) reddish brown (b) green

(c) grey (d) silvery white

(a) (b)

(c) (d)

31. What is the least count of the following voltmeter ?

(a) 0.5V (b) 0.1V (c) 0.05V (d) 0.005V

(a) 0.5 V (b) 0.1 V (c) 0.05 V (d) 0.005 V

32. Four students measured the following readings by observing, the position of pointer of

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voltmeter as shown, the correct one is :

(a) 2.5 V (b) 2.0 V (c) 2.2 V (d) 2.4 A

(a) 2.5 V (b) 2.0 V (c) 2.2 V (d) 2.4 A

33. For the circuits shown in figure-1 and figure-2 the ammeter reading would be :

(a) 1.0A in figure 1 and 0.0A in figure 2 (b) 0.0A in both

(c) 1.0A in both (d) 1.0A in figure 1 and 1.0A in figure 2

1 2

(a) 1.0A 1 0.0A 2 (b) 0.0A

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(c) 1.0A (d) 0.0A 1 1.0A - 2

34. In the circuit below the voltmeter and ammeter readings would be respectively :

(a) 0V and 0A each (b) 3V and 1A

(c) 1V and 3A (d) 3V and 3A

(a) 0V 0A (b) 3V 1A

(c) 1V 3A (d) 3V 3A

35. Which one of the following precaution is NOT to be taken while conducting the experiment

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

(a) Get the circuit diagram checked by your teacher before passing current.

(b) Connect +ve terminal of the ammeter to the +ve terminal of the battery.

(c) Wait atleast for 30 seconds after closing the key.

(d) Take care that the battery is not short circuited.

(a)

(b)

(c) 30

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(d)

36. In an experiment on photosynthesis, we cover a portion of a leaf „A‟ of a destarched potted

plant with opaque paper strips of red colour, a portion of another leaf „B‟ with black opaque

strip and a portion of leaf „C‟ with a green opaque strip and then keep the plant in sunlight

so that photosynthesis may take place.

After four hours on performing starch test the result showed no starch formation in the :

(a) covered portion of leaf „A‟

(b) covered portion of leaf „B‟

(c) covered portion of leaf „C‟

(d) covered portion of any of the above

„A‟

„B‟

„C‟

(a) „A‟

(b) „B‟

(c) „C‟

(d)

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

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

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

38. A well stained leaf peel mount when observed under the high power of a

microscope shows nuclei in :

(a) only epidermal cells

(b) only guard cells

(c) guard cells and epidermal cells both

(d) guard cells, epidermal cells and stomata

(a)

(b)

(c)

(d)

39. While preparing a temporary stained mount of a leaf epidermal peel, the extra stain

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is removed by :

(a) washing with water (b) washing with CaCl2 solution

(c) soaking with filter paper (d) absorbing with cotton wool.

(a) (b) CaCl2

(c) (d)

40. In the experiment demonstrating respiration in germinating seeds, KOH is used to :

(a) abosorb CO2 produced by the seeds.

(b) absorb O2 present in the flask

(c) absorb water vapour released by the seeds

(d) liberate O2 to be used by the seeds.

KOH

(a) CO2

(b) O2

(c)

(d) O2

41. Out of the four experimental set ups shown below, which one will demonstrate the

evolution of CO2 during respiration of germinating seeds ?

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

CO2

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

(i) (i) (ii)