CBSE Class 10 Science Question Paper SA 1 2011 (3)

8/12/2019 CBSE Class 10 Science Question Paper SA 1 2011 (3)

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SUMMATIVE ASSESSMENT -I (2011)Lakdfyr ijh{kk&I(2011)SCIENCE /foKku

Class

X/ &X

Time allowed : 3 hours Maximum Marks : 80fu/kkfjr le; 3 ?k.V vf/kdre vd 80General 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 offive 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 fourprovided to you.

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dsoy ,d Hkhrjh p;u dksmRrj fy[kusds fy, pqu ldrsgSaA

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fn, x;spkj fodYiksaesalsvkidksdsoy ,d lclsmi;qDr fodYi pquuk gSA

SECTION-A / ' '

1. Name the type of following reaction :

570018

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N23H2 2NH3

N23H2 2NH3

2. Name one metal which has very low melting point.

3. Name the residue obtained when wood is burnt in a limited supply of air.

4. A wire of resistivity is pulled to double its length. What will be its new resistivity ?

5. (a) What are the ionic compounds ?

(b) Give the formation of MgCl2from Mg and Cl2.

(a)

(b) Mg Cl2 MgCl2

6. Write observation with reaction for the following :

Water is added to plaster of Paris.

7. Define oxidation and reduction. In the reaction

MnO24 HClMnCl22H2OCl2

identify which one is reduced and which one is oxidized.

MnO24 HClMnCl22H2OCl2

8. What happens when iron nails are kept into a copper sulphate solution ? Write the balanced

chemical equation for the reaction.




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9. Name the enzyme found in saliva. State the role of saliva in the digestion of food.

10. (a) What is solar cell panel ?

(b) Name any two elements that are used for making solar cell panels.

(a)

(b)

11. When do you say that the resistance of a wire is 1 ?

1

12. What precautions should be taken to avoid overloading of domestic electric circuits ?

13. Two electric lamps rated 100 W, 220V and 25W, 220V are connected in parallel to a 220V

supply. Calculate the total electrical current in the circuit.

100 W, 220V 25W, 220V 220V

14. Give one equation each for decomposition reactions where energy is supplied in theform of :

(i) heat (ii) light (iii) electricity

(i) (ii) (iii)

15. When electricity is passed through a common salt solution, sodium hydroxide is produced

along with the liberation of two gases X and Y. X burns with a pop sound whereas Y is

used for disinfecting drinking water.

(i) Identify X and Y.

(ii) Give the chemical equation for the reaction stated above.

(iii) State the reaction of Y with dry slaked lime.

X Y

X Y




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(i) X Y

(ii)

(iii) Y

16. Name the gas that liberates when an acid reacts with a metal. Illustrate your answer with an

example giving the balanced equation for the reaction involved. How would you test the gasevolved ?

17. Ram has met with an accident after that he lost the capacity to

(i) walk in straight line,

(ii) smell anything,

(iii) does not feel full after eating.

Which part of brain is damaged in each case.

(i) ,

(ii)

(iii)

18. Draw the labelled structure of a neuron and explain the function of any two of its parts.

19. Why is it not possible to make use of solar cells to meet all our energy needs? State at

least three reasons to support your answer.

20. Draw a schematic diagram of a circuit consisting of 24 V battery, a 10 ohm resistor, a 5 ohmresistors, a 1 ohm resistors, an ammeter and a plug key all connected in series. Find theammeter reading and potential difference at the ends of 10 resistor.

24 V 10 5

1

10




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21. (a) Why are the heating elements of electric toaster and electric iron made of an alloyrather than pure metal ?

(b) An electric iron of resistance 20 takes a current of 5 A. Calculate the heat developedin 30 seconds.

(a)

(b) 20 5 A 30 s

22. A coil made of insulated copper wire is connected to a galvanometer. What will

happen to the deflection of the galvanometer if this coil is moved towards a stationary

bar magnet and then moved away from it? Give reason for your answer and name the

phenomenon involved.

23. (a) What is corrosion? Name the compound formed when :

(i) silver corrodes (ii) copper corrodes :

(b) Describe with an experiment the conditions essential for rusting of iron.

(a)

(i) (ii)

(b)

OR

(a) Define an Alloy.

(b) Write four important purposes of making alloy.

(c) Write the constituents of following alloys :

(i) Brass (ii) Bronze

(iii) Solder (iv) Stainless Steel.

(a)

(b)

(c)




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

24. (a) Draw neat diagram of human respiratary system and label its following parts :

Rings of cartilage, lung, bronchii , alveolar sac

(b) Write two differences between Aerobic and Anaerobic Respiration.

(a)

(b)

OR(a) Draw a neat diagram depicting human alimentary canal and label its following

parts.

stomach, liver, pancreas, small Intestine

(b) State in brief the function of digestive enzymes ?

(a)

(b)

25. (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)

OR

(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.




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What would be the direction of force experienced on the electron ?

(a)(b)(c)

SECTION B / ' '

26. Two colours seen at the extreme ends of pH chart are

(a) red and blue (b) red and green

(c) green and blue (d) orange and black

pH

(a) (b)

(c) (d)

27. A blue litmus paper was first dipped in dilute HCl and then in dilute NaOH solution.

It was observed that the colour of litmus paper :

(a) changed first to red then to colourless

(b) changed first to red then to blue

(c) changed blue to colourless

(d) remained blue in both solutions.

NaOH




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(a)

(b)

(c)

(d)

28. A 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)

29. When iron nail is kept in copper sulphate solution for about 3-4 hours, it is observed that

(a) only the tip of nail get the coating of copper

(b) only the bottom of the nail get the coating of copper

(c) whole nail get the coating of copper

(d) no coating is formed on the nail

3 - 4

(a)

(b)

(c)

(d)

30. When aqueous solutions of sodium sulphate and barium chloride are mixed together we find

that the reaction mixture :

(a) turns red (b) forms a white precipitate




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(c) forms a yellow precipitate (d) remains colourless

(a) (b)

(c) (d)

31. Which of the following experimental set up is correct for verification of Ohms

law ?

(a) A (b) B

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

(a) A (b) B

(c) A B (d) A B

32. 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




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

33. A voltmeter has a least count of 0.05 volt. While doing Ohms law experiment, a student

observed that the pointer of the voltmeter coincides with 15th division. The observed

reading is :

(a) 0.75V (b) 0.075V (c) 7.5V (d) 75V

0.05 V

15

(a) 0.75 V (b) 0.075 V (c) 7.5 V (d) 75 V

34. To determine the equivalent resistance of two resistors in parallel combination a circuit

is shown below. The component of the circuit whose terminals are wrongly connected

is :

(a) rheostat (b) cell (c) voltmeter (d) ammeter

(a) (b)

(c) (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 :




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The correct connections have been made by student

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

I, II, III IV

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




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36. A student covered a leaf from a destarched potted plant with a black paper strip and kept

the plant in the garden in morning hours. In the evening he tested the covered portion of the

leaf to test the presence of starch. In this case the student was trying to show that :

(a) CO2is given out during respiration

(b) CO2is essential for photosynthesis

(c) Chlorophyll is essential for photosynthesis.

(d) Light is necessary for photosynthesis.

(a) CO2

(b) CO2

(c)

(d)

37. A destarched leaf of a potted plant is partially covered with black strip of paper on the upper

and lower surfaces as shown in the figure and kept in sunlight. The starch test was

performed after this. What will be the colour of the regions marked as A and B in the leaf ?

(a) A-blue black, B-pale (b) A-green, B-pale

(c) A-pale, B-blue black (d) A-blue black, B-green

A B




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(a) A - B - (b) A - B -

(c) A - B - (d) A - B -

38. The stomatal apparatus comprises

(a) guard cells

(b) stomata and guard cell

(c) stomata, guard cells and accessory cells

(d) guard cells and chloroplast

(a)

(b)

(c)

(d)

39. While preparing a temporary mount of leaf epidermis, it is suggested that a brush

instead of a sharp needle should be used to transfer the peel from petridish to slide.

This is because the :

(a) sharp needle does not allow mounting of the peel.

(b) needles can be used to prevent the entry of bubbles on the mount.

(c) sharp needle may damage the cells.

(d) needle does not help in the proper transfer of peel from petridish to slide.

(a)

(b)




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(c)

(d)

40. In the following set up which shows that carbon dioxide is given out during respiration,

the KOH kept in the flask :

(a) makes the air in the flask alkaline

(b) creates partial vacuum in the flask by absorbing CO2gas

(c) absorbs moisture present in the flask

(d) provides oxygen for respiration to the germinating seeds

KOH

(a)

(b)

(c)

(d)

41. Given below are four different setups to show that CO2is released during respiration :

The set up will give the desired result with

(a) Dry gram seeds (b) Boiled gram seeds

(c) Germinating seeds (d) Wet and germinated gram seeds

CO2




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(a) (b)

(c) (d)


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CBSE Class 10 Science Question Paper SA 1 2011 (3)