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5HUDO5N

I, 2013

SUMMATIVE ASSESSMENT – I, 2013

/ SCIENCE

X / Class – X

3 90

Time allowed : 3 hours Maximum Marks : 90

The question paper comprises of two Sections, A and B. You are to attempt both the sections.

All questions are compulsory.

All questions of Section-A and all questions of Section-B are to be attempted separately.

1 3

Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence.

4 7 30-30

Question numbers 4 to 7 in Sections-A are two marks questions. These are to be answered in about 30 words each.

8 19 50-50

Question numbers 8 to 19 in Section-A are three marks questions. These are to be answered in about 50 words each.

20 24 70-70

Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each.

25 42

Question numbers 25 to 42 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.

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SECTION-A

1

How does the resistivity of alloys compare with those of pure metals from which they may have been formed ?

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2

In animals muscular movement is caused due to change in position of proteins. How do you

think movement will be brought about in ‘touch me not’ plant which lacks such proteins?

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3

What is acid rain ?

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4

Rohan and his friends were playing in the garden of their society. Suddenly Rohan was bitten by wasp

and soon her mother took him to home and applied solution of baking soda on affected area. Explain

how it would relieve Rohan of pain ?

2

5 MnO2 4HCl → MnCl22H2OCl2

(i) (ii)

(iii) (iv)

MnO2 4HCl → MnCl22H2OCl2

Identify the substance in the above reaction :

(i) Oxidised (ii) Reduced

(iii) Oxidising agent (iv) Reducing agent

2

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6 1m 200 0.5m 50

A 1m solenoid has 200 turns of wire, while a 0.5m solenoid has 50 turns of wire. Find out which solenoid has more number of turns per unit cm.

2

7 300C 10

An electric charge of 300C flows through a circuit for 10 minutes. Find the current that flows in the circuit.

2

8 ZnCO3

Zinc is a metal found in the middle of the activity series of metals. In nature, it is found as a carbonate ore, ZnCO3. Mention the steps carried out for its extraction from the ore. Support with equations.

3

9

(a) H₂O

(b) O₂ (c) HCl Write chemical equations for the reaction of aluminum with the following: (a) H₂O(Steam) (b) O₂ (c) HCl

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10

What is meant by a skeletal gap chemical equation? What does it represent? Using the equation for electrolytic decomposition of water differentiate between a skeletal chemical equation and a balanced chemical equation.

3

11 A B A B CO2

A CO2

(i) A B

(ii)

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A and B are the two components present in soda fire extinguisher. A and B react to release

CO2 which extinguisher fire. A on heating forms soda ash and releases CO2

(i) Identify A and B.

(ii) Write the chemical reaction involved.

12

Find the current flowing through the following electric circuit.

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13

What is ‘overloading’ of an electric circuit ? State two conditions that can lead to overloading of a circuit. How can it to be prevented ?

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14

Name two electrical appliances of daily use in which electric motor is used. Name and state the principle on which an electric motor works.

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15

The inner lining of the small intestine has numerous finger like projections. What are the they called ? List their functions.

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16

(a)

(b)

(c)

Give reasons for the following. (a) Arteries are thick walled. (b) Blood goes only once through the heart in fishes (c) Plants have low energy needs.

3

17

How do auxins promote the growth of a tendril around a support ?

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18

Write three points which should be considered while selecting a fuel or a source of energy.

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19

(a)

(b)

Aditya suggests his family to install a solar water heater at their residence. But some of the

family members were in a favour of installing an electric geyser.

(a) Who according to you is taking a correct decision ? Mention the value exhibited by

Aditya.

(b) Also give reasons (at least 2) for your answer.

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20

(a) Na, Ca Mg

(b)

(c)

(d)

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(e)

Explain the following : - (a) Metals like Na, Ca and Mg are never found in free state in nature. (b) Solder is used for welding electrical circuit. (c) Silver ornaments turn blackish after some time. (d) Gold is used for making jewellery. (e) Gallium will melt if you kept it on your palm.

21 HCl, HNO3, ZnCl2, AgNO3 H2O

You are provided with container made up of aluminium. You are also provided with

solutions of dil Hcl, dil HNO3, ZnCl2 and H2O. Out of these solutions which solutions, can be

kept in aluminium container. Name the type of reaction taking place.

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22 (a)

(i)

(ii)

(iii)

(b)

(a) A circular coil whose ends are connected to a galvanometer is (i)

moved with a uniform velocity towards a magnet, (ii) kept in front of magnet (iii)

taken away from magnet. Explain with reason the observations that would be made

in each case.

(b) What is an earth wire ? Explain the purpose of using it in domestic electric circuit .

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23 2V

0.4A

(i)

(ii)

(iii) V I

When a high resistance voltmeter is connected directly across an electric bulb it’s reading is 2V. An electric cell is sending the current of 0.4 ampere (measured by an ammeter) in the electric circuit.

5

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(i) Draw the circuit (ii) Find the resistance of the electric bulb. (iii) State the law that is applied for making these calculation. If a graph is plotted between V and I, show the nature of graph obtained.

24 (a)

(i)

(ii)

(iii)

(iv)

(b)

(c)

(a) Draw human excretory system and label the following parts: - (i) left kidney (ii) Urethra (iii) Urinary Bladder (iv) Vena cava (b) State the purpose of making urine. (c) Name any two substances which are selectively reabsorbed from the tubules of a

nephron.

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/ SECTION - B

25

(a)

(b)

(c)

(d)

The products of reaction between zinc and sodium hydroxide solution are :

(a) sodium carbonate and water

(b) sodium zincate and hydrogen

(c) zinc hydroxide and hydrogen

(d) zinc carbonate and hydrogen

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26 pH pH

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

A student living in an industrial area dipped pH paper in rain water. The colour of pH paper

will turn to :

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

27 CuSO4

(a)

(b)

(c)

(d)

Which one is not observed when aluminium strip is added to a solution of CuSO4 ? (a) The solution is blue initially (b) After some time the solution becomes colourless (c) After some time the solution becomes warm (d) A brown flaky substance is deposited on aluminium strip

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28

(a) (b)

(c) (d)

On passing carbon-dioxide gas through the product formed by the reaction between quick

lime and water, solution becomes : (a) yellow (b) white (c) green (d) pink

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29 5 ml

(a)

(b)

(c)

(d)

Mani took a test tube and added some quick lime and about 5 ml of water to it. The correct observation regarding reaction is : (a) A black powder is formed with a hissing sound (b) A brown solution is formed and a gas is evolved (c) A white powder is formed and the test tube becomes cold (d) A white substance is formed and a lot of heat is evolved

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30 X, Y, Z

X YA → XA Y Z XA → ZA X

(a) Z, Y Y, X

(b) Z, X X, Y

(c) Y, X X, Z

(D) X, Z Z, Y

Anindita took three metals labelled X, Y and Z. She carried out displacement reactions with their salt solutions. She observed that : X YA → XA Y Z XA → ZA X The correct conclusion is : (a) Z is more reactive than Y and Y is more reactive than X (b) Z is more reactive than X, and X is more reactive than Y (c) Y is more reactive than X, and X is more reactive than Z (D) X is more reactive than Z, and Z is more reactive than Y

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31

(a)

(b)

(c)

(d)

Which is the correct method to show that zinc is more reactive than copper ? (a) Dip copper metal in a solution of zinc sulphate and wait for an hour (b) Heat zinc and copper metals together (c) Dip zinc metal in a solution of copper sulphate and wait for an hour (d) Pour dilute sulphuric acid on both the metals

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32 0 1.0 20

(a) 0.02A (b) 0.01 A (c) 0.2 A (d) 0.05A An ammeter has 20 divisions between mark 0 and mark 1.0 on its scale. The least count of the ammeter is : (a) 0.02A (b) 0.01 A (c) 0.2 A (d) 0.05A

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33

(a)

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(b)

(c)

(d)

If in a circuit the voltage remains same and the resistance is one fourth of its original value.

The effect on the current will be:-

(a) Current will increase 3 times

(b) Current will decrease 3 times

(c) Current will increase 4 times

(d) Current will decrease 3 times

34

(a)

(b)

(c)

(d)

A student arranged an electric circuit as shown for studying the dependence ofcurrent on the potential difference across a resistor:

He would observe— (a) no reading in either the ammeter or the voltmeter (b) no reading in the voltmeter but a finite reading in the ammeter (c) no reading in the ammeter but a finite reading in the voltmeter. (d) a finite reading in both the ammeter and the voltmeter.

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35

(a) 6.0V (b) 0.6V (c) 1.2V (d) 3V In the circuit given below the voltmeter reading will be :

(a) 6.0V (b) 0.6 V (c) 1.2V (d) 3V

1

36 1 Ω, 2Ω 3Ω

(a) 3/11Ω

(b) 4/11Ω

(c) 5/11Ω

(d) 6/11Ω

The resultant resistance in a parallel combination of there resistances 1Ω,2Ω and 3Ω, is

(a) 3/11Ω

(b) 4/11Ω

(c) 5/11Ω

(d) 6/11Ω

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37

(a) (1)

(2)

(3)

(b) (1)

(2)

(3)

(c) (1)

(2)

(3)

(d) (1)

(2)

(3)

Select the correct labelling for the following diagram.

(a) (1) Epidermal cells

(2) guard cells

(3) stoma

(b) (1) epidermal cells

(2) stoma

(3) guard cells

(c) (1) guard cells

(2) stoma

1

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(3) epidermal cells

(d) (1) stoma

(2) epidermal cells

(3) guard cells

38

(a)

(b)

(c)

(d)

While preparing a temporary stained mount of a leaf epidermal peel, the extra stain is removed by: (a) Washing with water (b) Washing with sodium chloride solution (c) Soaking with filter paper (d) Absorbing with cotton wool

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39

?

(a)

(b)

(c)

(d)

Which one of the following is the combination of relevant materials required for setting up an

experiment to show that light is necessary for photosynthesis ?

(a) De-starched leaves, strips of black paper, starch solution and iodine crystals

(b) A potted plant, strips of colored paper, starch solution, iodine and potassium iodide

(c) De-starched leaves, strips of black paper, starch solution and potassium iodide

(d) De-starched leaves, strips of black paper and iodine solution

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40

5

1

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?

(a)

(b)

(c)

(d)

A portion of each of four de-starched leaves of plant was covered with paper strips of various

colors. The plant was exposed to sunlight for 5 hours. Thereafter the strips were removed and

the leaves tested for starch in the covered portion. Which one out of the four leaves gave the

positive starch test in the covered portion?

(a) That covered with black paper strip

(b) That covered with green paper strip

(c) That covered with white paper strip

(d) That covered with a transparent paper strip

41 CO2

(a)

(b)

(c)

(d) CO2

In the experiment to show that CO2 is given out during respiration, the initial level of water in

the delivery tube at the end which is immersed in the water of the beaker is:

(a) Same as the final level

(b) More than the final level

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(c) Less than the final level

(d) Dependent on the amount of CO2 in the atmosphere

42 CO2

(a)

(b)

(c)

(d)

Seema used totally dry seeds in the experimental set – up to show that CO2 is released during respiration. After about 2 hours she observed that :

(a) Water level in the bent tube remains at the initial level

(b) Water level in the bent tube rises above the initial level

(c) Water level in the bent tube first rises, then decreases from the initial level

(d) Water level in the bent tube decreases than the initial level

1

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