Class IX

Average kinetic energy of gas molecules is directly proportional to
  1. T2
  2. √T
  3. T
  4. 2T
Movement of molecules from higher concentration to lower concentration is called
  1. diffusion
  2. concentration
  3. effusion
  4. mobility
Position of liquid molecules are
  1. fixed
  2. not fixed
  3. not sliding
  4. none of above
Process in which vapor molecules are recaptured by molecules at liquid surface is called
  1. evaporation
  2. sublimation
  3. condensation
  4. boiling
. In graphite carbon atoms are arranged in layers of
  1. pentagonal arrays
  2. heptagonal arrays
  3. octagonal arrays
  4. hexagonal arrays
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