heat and kinetic theory of gases

Heat and kinetic theory of gases

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Question 1. A pressure cooker works on the principle of

elevation of boiling point of water by application of pressure (NA)

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Question 2. Pressure of a gas increases due to increase of its temperature because at higher temperature

gas molecules repel each other more (NA)

potential energy of the gas molecules is higher (NA)

kinetic energies of the gas molecules are higher (NA)

gas molecules attract each other more (NA)

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Question 3. A balloon filled up with gas would only go up on air it is filled up with

a gas whose density is lower than air (NA)

a gas whose density is higher than air (NA)

cold air (NA)

water vapour (NA)

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Question 4. The temperature of water at the bottom of a lake whose upper surface has frozen to ice would be around

_10°C (NA)

0°C (NA)

4°C (NA)

_4°C (NA)

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Question 5.

a (a)

b (b)

c (c)

d (d)

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Question 6.

A (A)

B (B)

C (C)

D (D)

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Question 7.

A (A)

B (B)

C (C)

D (D)

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Question 8.

A (A)

B (B)

C (C)

D (D)

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Question 9. When a solid is heated, it turns directly into a gas. This process is called

condensation (NA)

evaporation (evaporation)

sublimation (sublimation)

diffusion (NA)

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Question 10. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point. The melting point of a solid is an indication of

strength of the intermolecular forces of attraction (NA)

strength of the intermolecular forces of repulsion (NA)

molecular mass (NA)

molecular size (NA)