Class IX

Molecules of liquid which escape first have
  1. highest kinetic energy
  2. lowest kinetic energy
  3. moderate kinetic energy
  4. infinite kinetic energy
Force exerted by a gas on unit area of container is called
  1. effusion
  2. diffusion
  3. mobility
  4. pressure
At mount Everest water boils at
  1. 100°C
  2. 90°C
  3. 80°C
  4. 70°C
As molecular mass of gasses increases their density
  1. decreases
  2. increases
  3. remains unchanged
  4. none of above
Barometer is invented by
  1. Galileo
  2. Robert Boyle
  3. Charles
  4. Torricelli
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