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2.3 Transfer of thermal energy

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Question 20

Which of the following explains why a convection current is formed in a gas when it is heated from below?

A

The heated gas expands and its density decreases, causing it to rise.

B

The individual molecules in the heated gas expand, causing them to float upwards.

C

The heated gas contracts and its density increases, causing it to sink.

D

The molecules in the gas gain mass as they absorb thermal energy, causing them to fall.

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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