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2.3 Transfer of thermal energy

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Question 51

Air above a radiator is heated and expands.

How does this thermal expansion lead to the formation of a convection current?

A

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

B

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

C

The mass of the air molecules decreases, making them lighter.

D

The molecules themselves expand, increasing their individual volumes.

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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