Class IX

Which of the following is most suitable for summer?
  1. cotton
  2. nylon
  3. polyster
  4. silk
Which of the following does not affect rate of evaporation?
  1. Wind speed
  2. surface area
  3. temperature
  4. Insoluble heavy impurities
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
A solid has
  1. Definite shape and volume
  2. No definite volume no definite shape
  3. Definite volume and no definite shape
  4. Definite shape but no definite volume
Which of the following statements is incorrect?
  1. Matter is made up of particles
  2. Matter is continuous in nature
  3. from both surface and bulk
  4. neither from surface nor from bulk
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