WAEC Physics 2021 Objective — Question 21

Question 21 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.

21. Which of the following statements is an effect of compressing gas molecules at constant temperature?

A. The pressure on the molecules decreases
B. The molecules gain more kinetic energy
C. The molecules make more impact per second on the walls of the containerCorrect
D. The molecules increase in size

Explanation

Compressing the gas reduces its volume, so molecules collide with the container walls more frequently, increasing pressure.

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