The materials which trap air inside them are

  • bad conductors of heat
  • good conductors of heat
  • moderately conducts heat
  • transfer heat by convection

When temperature of an object is higher than its surroundings then as compare to absorbing, it is radiating

  • more heat
  • less heat
  • equal heat
  • zero heat

A metal box having four faces of different nature is called

  • Leslie triangle
  • Leslie hexagon
  • Leslie pentagon
  • Leslie cube

The rising currents of hot air are called

  • air currents
  • thermals
  • radiation
  • layers

Poor conductors of heat are

  • liquids only
  • gases only
  • metals
  • liquids and gases

The mode of transfer of heat by vibrating atoms and free electrons in solids from hot to cold parts of a body is known as heat's

  • radiation
  • convection
  • conduction
  • fusion

The rate of heat flow is

  • directly proportional to length
  • inversely proportional to length
  • not related to length
  • none of above

Central heating systems in buildings work on the principle of

  • convection
  • radiation
  • conduction
  • all of above

The good conductors of heat is

  • water
  • wool
  • rubber
  • metal

The process in which heat is transferred in form of waves is called

  • Conduction
  • convection
  • thermal climbing
  • radiation

Central heating system in buildings work on the principle of

  • convection
  • fusion
  • radiation
  • conduction

As compared to non-metals, heat reaches from the hot part to the cold parts of the metal objects

  • slowly
  • quickly
  • equal time
  • none of above

If the temperature of an object is higher than its surroundings then it is

  • radiating more heat than absorbing
  • conducting more heat than absorbing
  • absorbing more heat than radiating
  • conducting less heat than radiating

Metals are good conductors due to

  • rapid vibration of atoms
  • small size molecules
  • big size molecules
  • free electrons

A small airplane without engine which ride over the terminals is known as

  • glider
  • moderator
  • parachute
  • spinner

Like light rays, heat radiations also obey

  • law of friction
  • law of reflection
  • law of motion
  • law of refraction

As compare to black surface, a white surface reflects

  • nothing
  • equal
  • less
  • more

When temperature of an object is lower than its surroundings then as compare to absorbing, it is radiating

  • more heat
  • less heat
  • equal heat
  • zero heat

Carbon dioxide in atmosphere traps the radiation and causes

  • decrease in temperature
  • greenhouse effect
  • depletion of ozone layer
  • formation of ozone layer

The mode of transfer of heat from one place to another in the form of electromagnetic waves is called

  • fusion
  • convection
  • radiation
  • conduction
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