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Thursday, 09 April 2026
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Which of the following statements is true?

Which of the following statements is true?
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A An increase in the temperature of a given mass of gas increases the number of gas molecules
  • B An increase in the temperature of the gas does not affect the kinetic energy
  • C An increase in the pressure of the gas is proportional to the increase in volume
  • D A increase in the pressure of a gas is proportional to the decrease in volume at constant temperature
  • E A decrease in the pressure of the gas decreases the number of gas molecules present
Correct Answer: Option D
Explanation:
The correct answer is D: an increase in the pressure of a gas is proportional to the decrease in volume at constant temperature.

This statement is based on Boyle's Law, which states that for a given amount of gas at constant temperature, the pressure and volume are inversely proportional. In other words, if the pressure of a gas increases, its volume decreases, and if the pressure decreases, the volume increases, as long as the temperature is held constant.

Mathematically, this is expressed as:

\[ P \times V = \text{constant} \]

where P is the pressure and V is the volume of the gas.

So, an increase in pressure leads to a decrease in volume when the temperature remains constant, making option D the correct statement.

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