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Which of the following statement is not true regarding conduction of heat ?

  • A.Conduction is faster in solids than liquids.
  • B.Two objects should be in contact with each other for heat flow.
  • C.Conduction does not take place in gases.
  • D.All materials do not allow heat to flow through them in same way.

Answer: C

The statement that is not true is that conduction does not take place in gases.

Conduction transfers heat through collisions between particles, and it occurs in solids, liquids and gases. In gases the particles are far apart, so conduction is very slow (gases are poor conductors) and convection usually dominates, but it still occurs.

The other statements are true: conduction is faster in solids than in liquids, it requires contact between the objects, and different materials conduct heat differently (metals well, wood and plastic poorly).

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