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2.3 Transfer of thermal energy

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Question 239

A room is heated by a heater installed near the floor. Why is the heater placed near the floor to warm the room most efficiently?

A

Warm air is less dense and rises, while cooler, denser air sinks.

B

Warm air is a poor conductor, so heat is not conducted out through the floor.

C

Warm air is a good conductor, so heat is easily conducted to the top of the room.

D

Warm air remains near the floor and 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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