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2.3 Transfer of thermal energy

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Question 232

Which statement correctly explains why a convection current is created in a fluid when it is heated from below?

A

The heated fluid expands, becomes less dense, and rises.

B

The individual molecules in the heated fluid expand and float upwards.

C

The heated fluid contracts, increases in density, and rises.

D

The pressure at the top of the fluid increases, forcing the hot fluid upwards.

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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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