Class VII

When heating element of food cooker is turned out, at first it emits
  1. heat energy
  2. gamma rays
  3. infrared waves
  4. radio waves
At night, convection current of land and sea
  1. remains same
  2. stops
  3. is reversed
  4. is converted to radiation current
Heat is not allowed to pass through by a
  1. metalloids
  2. transition metals
  3. non-metals
  4. metals
In a thermograph, heat is identified by
  1. different sizes of lines on the photograph
  2. different shapes on the photographs
  3. different colors on the photographs
  4. different densities on the thermograph
Air is
  1. thermal conductor
  2. thermal insulator
  3. electrical conductor
  4. an electrolyte
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