Class VIII

In appliances like electric irons, heaters, air-conditioners and refrigerators temperatures are kept constant by
  1. stabilizer
  2. extension
  3. thermostat
  4. thermometer
Hot air balloons rises due to occurrence of expansion of
  1. gases
  2. balloon
  3. fuel
  4. flame
Gain or loss of heat affect state of
  1. matter
  2. conduction
  3. convection
  4. radiation
Concrete roads on hot days do
  1. expand
  2. contracts
  3. both a and b
  4. break
In laboratory thermometer which is used to measure temperatures is
  1. ordinary thermometer
  2. laboratory thermometer
  3. both a and b
  4. none
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