O-LevelPhysicsThermal Physics5054/11 · May/June 2013 · Q131 Mark
A glass beaker contains water. When the centre of the base of the beaker is heated, a convection current is set up. 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 evaporation of water causes water molecules to rise to the surface.
BThe expansion of water molecules causes them to rise to the surface.
CThe water above the heat source rises because it becomes less dense.
DThe water at the sides sinks because it becomes less dense.
✓ Correct answer
C: The water above the heat source rises because it becomes less dense.
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