Class IX

A gas that shields living things on surface of earth from harmful UV radiation is
  1. N2
  2. SO2
  3. O2
  4. O3
Pressure that vapors apply on surface of liquid at equilibrium is called
  1. vapor pressure
  2. liquid pressure
  3. liquid pressure
  4. condensation
If liquid is heated to increase kinetic energy then liquid will
  1. evaporate slowly
  2. evaporate faster
  3. will not evaporate
  4. boil
Solids whose atoms arrange themselves in different forms are
  1. isotopes
  2. crystals
  3. allotropes
  4. amorphous
Movement of molecules from higher concentration to lower concentration is called
  1. diffusion
  2. concentration
  3. effusion
  4. mobility
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