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2.3 Transfer of thermal energy

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Question 183

A gas is heated, causing it to expand. How does this expansion lead to the formation of a convection current?

A

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

B

The density of the heated gas increases, causing it to sink.

C

The mass of the individual gas molecules decreases, making them lighter.

D

The thermal energy increases the mass of the gas molecules, forcing them upwards.

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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