IGCSE · 2 · multiple choice
Thermal physics · Question 4
Thermal physics · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 1
- Topics
- 1
- Answer
- Complete
Which statement about evaporation is correct?
- A
It happens throughout the liquid, at one fixed temperature.
- B
It happens only at the surface, at any temperature below the boiling point.
- C
It raises the temperature of the liquid that is left behind.
- D
It happens faster when the air above the liquid is still and humid.
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Answer and reasoning
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is B: It happens only at the surface, at any temperature below the boiling point.
- 2
A describes boiling, which is the distinction the item is set on. C reverses the cooling effect — the fastest molecules leave, so the mean energy of those remaining falls. D reverses the effect of a draught.
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