WAEC Physics 2015 Objective — Question 20
Question 20 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.
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In an experiment in which a molten substance is allowed to cool, the cooling curve shown above was obtained. The temperature 60°C is known as the
- A. vaporization point
- B. cooling temperature
- C. boiling point
- D. melting pointCorrect
Explanation
The flat (plateau) section of a cooling curve marks the temperature at which the substance changes from liquid to solid at a constant temperature - the melting (freezing) point.
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