Class IX

. If liquid is heated to increase kinetic energy then liquid will
  1. evaporate slowly
  2. evaporate faster
  3. will not evaporate
  4. boil
An ordered, repeating three dimensional arrangement of particles makes up a
  1. crystalline solid
  2. amorphous solid
  3. can be both A and B
  4. none of above
Process in which solid changes directly in to vapors without changing in liquid state is called
  1. condensation
  2. evaporation
  3. boiling
  4. sublimation
A gas that shields living things on surface of earth from harmful UV radiation is
  1. N2
  2. SO2
  3. O2
  4. O3
. 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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