WAEC Physics 2015 Objective — Question 15

Question 15 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.

The diagrams below illustrate four test-tubes containing the same volume of a liquid at different pressures. In which of the test-tubes does the liquid boil last if they are supplied with the same quantity of heat?

A. the tube at 2 atmospheresCorrect
B. the tube at 1½ atmosphere
C. the tube at 1 atmosphere
D. the tube at less than 1 atmosphere

Explanation

An increase in pressure raises the boiling point of a liquid, so the test-tube under the highest pressure (2 atmospheres) requires the highest temperature and therefore boils last.

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