Melting and Boiling Multiple Choice Questions (MCQs) PDF Download - 1

Statement related to the process of evaporation that is incorrect is

1. Evaporation occurs at any temperature
2. Evaporation takes place within the liquid
3. Temperature may change during evaporation
4. No bubbles are formed in the liquid during evaporation

As pressure is lowered,

1. the melting point of the ice decreases
2. the melting point of the ice increases
3. the boiling point of the water increases
4. no change is observed the melting point of ice or boiling point of water

Latent heat of vaporization is

1. the amount of heat required to raise the temperature of a 1 kg of a substance by 1 K
2. the amount of heat required to raise the temperature of a substance by 1 K
3. the amount of heat required to change the phase of a substance from solid to liquid without any change in temperature
4. the amount of heat required to change the phase of a substance from liquid to gas without any change in temperature

Specific latent heat of fusion is

1. the amount of heat required to raise the temperature of a 1 kg of a substance by 1 K
2. the amount of heat required to change the phase of a substance from solid to liquid without any change in temperature
3. the amount of heat required to change the phase of a 1 kg of substance from solid to liquid without any change in temperature
4. the amount of heat required to change the phase of a 1 kg of substance from liquid to gas without any change in temperature

Provided that the latent heat of fusion of a 5.4 kg block of ice has been provided by a heater of 1 kW for 1800 s, the specific latent heat of fusion of ice would then be equal to

1. 333 kJ ⁄ kg
2. 340 kJ ⁄ kg
3. 350 kJ ⁄ kg
4. 360 kJ ⁄ kg