Class VII

Like light and heat, radio waves can travel in
  1. water
  2. solids
  3. sand
  4. vacuum
When warm air rises over land,
  1. vacuum is created beneath it
  2. more warmer air replaces it
  3. temperature decreases
  4. cooler air from sea replaces it
Another use of thermal imaging cameras in firefighting is
  1. spotting sources of fire
  2. spotting people in the fire
  3. identifying flammable objects
  4. identifying woods and steel
Movement of cooler air from land to sea is known as
  1. Sea breeze
  2. Land breeze
  3. Forward breeze
  4. Reverse breeze
If a radiator is installed in a room, it warms air by process of
  1. Conduction
  2. Convection
  3. Radiation
  4. Warming
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