Class IX

Movement of molecules from higher concentration to lower concentration is called
  1. diffusion
  2. concentration
  3. effusion
  4. mobility
Pressure that vapors apply on surface of liquid at equilibrium is called
  1. vapor pressure
  2. liquid pressure
  3. liquid pressure
  4. condensation
Average kinetic energy of gas molecules is directly proportional to
  1. T2
  2. √T
  3. T
  4. 2T
Boiling point is temperature at which
  1. vapor pressure is more than external pressure
  2. Vapor pressure is less than external pressure
  3. Vapor pressure is not related to external pressure
  4. Vapor pressure is equal to external pressure
In pressure cooker pressure applied is
  1. 1 atm
  2. 2 atm
  3. 3 atm
  4. 4 atm
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