Class IX

Escape of gas molecules from a small hole one after other is called
  1. diffusion
  2. effusion
  3. concentration
  4. mobility
Process in which vapor molecules are recaptured by molecules at liquid surface is called
  1. evaporation
  2. sublimation
  3. condensation
  4. boiling
At mount Everest water boils at
  1. 100°C
  2. 90°C
  3. 80°C
  4. 70°C
On increasing temperature of amorphous solid they
  1. melt at specific temperature
  2. soften gradually
  3. break at specific temperature
  4. boil at specific temperature
Average kinetic energy of gas molecules is directly proportional to
  1. T2
  2. √T
  3. T
  4. 2T
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