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2.3 Transfer of thermal energy

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Question 206

Air above a heater is warmed and expands. How does this thermal expansion lead to the formation of a convection current in the room?

A

The density of the warmed air decreases, causing it to rise.

B

The density of the warmed air increases, causing it to rise.

C

The mass of the individual air molecules decreases, causing them to rise.

D

The individual air molecules expand, causing them to rise.

Markscheme

2.3 Transfer of thermal energy Questions

  1. IGCSE
  2. /Physics
  3. /2.3 Transfer of thermal energy

301 exam-style questions on CIE IGCSE Physics 2.3 Transfer of thermal energy, covering 2.3.1a Thermal conductors and thermal insulators, 2.3.1b Explaining thermal conduction, 2.3.2 Convection, 2.3.3a Thermal radiation, 2.3.3b Surface colour and texture, 2.3.3c Rate of emission and absorption of radiation, and 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.

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