Class VII

Electricity companies use thermal imaging camera to identify
  1. the resistivity of a wire
  2. the resistivity of a resistor
  3. overheating of wires and power lines
  4. the heat released by each electrical appliance
Heat cannot flow by these means because there is no
  1. wind
  2. air
  3. vacuum
  4. energy
In hot countries, most buildings are painted
  1. white
  2. black
  3. blue
  4. brown
Loss of heat in winter is a lot of waste of
  1. fuel
  2. electricity
  3. power
  4. energy
At night, convection current of land and sea
  1. remains same
  2. stops
  3. is reversed
  4. is converted to radiation current
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