Class VII

An example of good insulator of heat is
  1. iron
  2. wood
  3. gold
  4. zinc
Birds trap air between spaces of their feathers, because is
  1. thermal conductor
  2. thermal insulator
  3. electrical conductor
  4. an electrolyte
At night, convection current of land and sea
  1. remains same
  2. stops
  3. is reversed
  4. is converted to radiation current
In cold climates, building gets cold because of excess escape of
  1. heat
  2. radiations
  3. waves
  4. rays
Heat cannot flow by these means because there is no
  1. wind
  2. air
  3. vacuum
  4. energy
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