Class IX

The quantity of heat required to change unit mass of a solid into liquid at atmospheric pressure at its melting point is called
  1. Latent heat of vaporisation.
  2. latent heat of fusion.
  3. latent heat of sublimation
  4. latent heat of evaporation.
. Evaporation of a liquid occurs at
  1. its boiling point.
  2. room temperature.
  3. all temperatures.
  4. a temperature higher than its boiling point.
Liquefaction of all gases can be achieved by
  1. increasing the pressure
  2. decreasing the temperature
  3. decreasing the temperature and increasing the pressure
  4. increasing the temperature and decreasing the pressure
The boiling points of the liquids decrease in the following order: B.P of water > B.P of kerosene > B.P of alcohol > B.P of petrol. Which of the following order is correct for decreasing rate of evaporation?
  1. water > alcohol = kerosene > petrol
  2. petrol > alcohol > kerosene > water
  3. remains same in all liquids
  4. water > kerosene > alcohol > petrol
Under which of the following conditions we can boil water at room temperature?
  1. At low pressure
  2. At high pressure
  3. At very high pressure
  4. At atmospheric pressure
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