Class VII

Color and texture that is poor absorber of radiant heat is
  1. shiny and black
  2. dull and black
  3. shiny and white
  4. dull and white
Best insulating windows use
  1. single glazed windows
  2. double glazed windows
  3. double painted windows
  4. single painted windows
If a radiator is installed in a room, it warms air by process of
  1. Conduction
  2. Convection
  3. Radiation
  4. Warming
Extra warming of earth due to greenhouses stimulators is called
  1. earth warming
  2. CFC warming
  3. Greenhouse warming
  4. Global warming
Number of walls of a thermos are
  1. 1
  2. 2
  3. 3
  4. 4
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