WAEC Physics 2022 Objective — Question 9
Question 9 of 50 from the West African Examinations Council (WAEC) Physics 2022 Objective paper, with the correct answer and a full explanation.
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Which of the following statement(s) is/are correct about a fixed mass of an inexpansible gas compressed in an inexpansible container? I. The average speed of the molecules increases. II. The temperature of the gas increases. III. The molecules hit the walls of the container more often than before the compression.
- A. I only
- B. I and II only
- C. I, II and III
- D. I, II and IIICorrect
Explanation
Compressing a gas at constant volume causes molecular collisions to become more frequent and more energetic (raising temperature and average speed) — all three statements (I, II, III) are correct.
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