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ICSE Class 10 Physics Solved Question Paper 2015

Short Answer Type

31.
A cell of emf 2 V and internal resistance 1.2 is connected with an ammeter of resistance 0.8 and two resistors of 4.5 and 9 is shown as in the diagram below:

i) What would be the reading on the ammeter?
ii) What is the potential difference across the terminals of the cell?

Given,

E = 2 V, r = 1.2 , R = external resistance

Let 4.5 $straight capital omega$ and 9 $straight capital omega$ are connected in parallel, then equivalent resistance becomes,

$1 divided by straight R subscript straight P space end subscript space equals space 1 divided by 4.5 plus space space 1 divided by 9 space$

$1 over R subscript P equals space fraction numerator 2 plus 1 over denominator 9 end fraction equals space 3 over 9 equals space 1 third$

R_P = 3 $straight capital omega$

Now, 0.8 $straight capital omega$ , and R_P resistance in series, then total resistance is,

$straight R space equals space 3 space plus space 0.8 space equals space 3.8 space straight capital omega$

i) Current in 0.8 $straight capital omega$ resistance, I = $Error converting from MathML to accessible text.$
ii) Terminal voltage, V = E – I r = 2 – 0.4 × 1.2 = 2 – 0.48 = 1.52 Volt

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32.

i) Name the device used to increase the voltage at a generating station.

ii) At what frequency is A.C. supplied to residential houses?

iii) Name the wire in a household electrical circuit to which the switch is connected.

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33.

i) Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals.

ii) State an additional use of the waves mentioned in part (e) (i)?

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34.

i) Why does a current carrying, freely suspended solenoid rest along a particular direction? [2]

ii) State the direction in which it rests.

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35.

Give two similarities between A.C. generator and a D.C. motor.

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36.

Rishi is surprised when he sees water boiling at 115^o C in a container. Give reasons as to why water can boil at the above temperature.

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37.

i) Name a gas caused by the Greenhouse effect.

ii) Which property of water makes it an effective coolant?

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38.

i) Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support for your answer.

ii) What is the principle of calorimetry?

iii) Name the law on which the principle is based.

iv) State the effect of an increase of impurities on the melting point of ice.

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39.

A refrigerator converts 100 g of water at 20^o C to ice at -10^o C in 35 minutes. Calculate the average rate of heat extraction in terms of watts.

Given: Specific heat capacity of ice = 2.1 J g^-10o C^-1Specific heat capacity of water = 4.2 J g^-10o C^-1Specific Latent Heat of Fusion of ice = 336 J g^-1

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