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2.3 Transfer of thermal energy

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Question 111

An air conditioning unit is mounted high up on a wall near the ceiling of a room. Why is the air conditioning unit placed near the ceiling to cool the room?

A

Cold air sinks and warm air is displaced upwards.

B

Cold air is a bad conductor so heat is not conducted into the room.

C

Cold air is a good conductor so heat is conducted out of the room.

D

Cold air remains at the top and so prevents convection.

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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