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2.3 Transfer of thermal energy

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Question 71

The table below gives some examples of convection and explanations of how the convection occurs.

Which row is correct?

ExampleExplanation
ARefrigeratorThe cooling element is placed at the top because cold air becomes less dense and rises, cooling the upper compartments first.
BBoiling water in a kettleWater at the bottom is heated, becomes less dense, and rises, transferring thermal energy upward.
CRoom heater (radiator)The radiator is placed near the floor because hot air becomes denser and sinks, spreading across the floor.
DDaytime sea breezeAir over the sea heats up faster than air over the land, causing the warm air over the sea to rise and cold air from the land to blow towards the sea.
A

Row A

B

Row B

C

Row C

D

Row D

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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