Class IX

Movement of molecules from higher concentration to lower concentration is called
  1. diffusion
  2. concentration
  3. effusion
  4. mobility
Barometer is invented by
  1. Galileo
  2. Robert Boyle
  3. Charles
  4. Torricelli
Molecules of liquid which escape first have
  1. highest kinetic energy
  2. lowest kinetic energy
  3. moderate kinetic energy
  4. infinite kinetic energy
Melting and freezing of a substance occurs as
  1. same temperature
  2. more than melting point
  3. more than freezing point
  4. less than boiling point
Process in which vapor molecules are recaptured by molecules at liquid surface is called
  1. evaporation
  2. sublimation
  3. condensation
  4. boiling
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