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2.3 Transfer of thermal energy

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Question 89

An engineer measures the air temperature at different heights from the floor in a large, unventilated hall. The results are recorded in the table:

Height from floor (m\text{m}m)Temperature (∘C^\circ\text{C}∘C)
0.017.0
2.018.1
4.019.5
6.020.6
8.022.0

Which statement explains why the temperature of the air increases with height?

A

The average kinetic energy of molecules is lower in warm air than in cool air.

B

The molecules in warm air are packed more closely together than in cool air.

C

Cool air is less dense than warm air, so it rises.

D

Warm air is less dense than cool air, causing it to rise.

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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