O-LevelPhysicsThermal Physics5054/11 · Oct/Nov 2013 · Q131 Mark
On a cold afternoon, a house loses 54 MJ of thermal energy (heat) to its surroundings as shown. The heating system must supply more than 54 MJ of thermal energy to keep the temperature of the house constant. Which statement explains this?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThe extra thermal energy is lost from the house to the surroundings by other means.
BThe extra thermal energy keeps the house warmer than the surroundings.
CThe temperature of the surroundings decreases continuously during this period.
DThe thermal insulation of the roof is extremely ineffective.
✓ Correct answer
A: The extra thermal energy is lost from the house to the surroundings by other means.
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