Class IX

When ice melts to water, heat is
  1. evolved.
  2. absorbed.
  3. no change
  4. evolved or absorbed depending upon the conditions.
Which of the following is most suitable for summer?
  1. cotton
  2. nylon
  3. polyster
  4. silk
Solids cannot be compressed because:
  1. constituent particles are very closely packed
  2. constituent particles are very closely packed
  3. movement of constituent particles is restricted
  4. movement of constituent particles is restricted
On increasing the temperature of a gas
  1. its K.E increases
  2. its K.E decreases
  3. its gets converted into liquid
  4. its particles come closer to each other
A change of state directly from solid to gas without changing into liquid state (or vice versa) is called
  1. Diffusion
  2. Sublimation
  3. Evalopartion
  4. Condensation
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