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Engineering Exams RRB-JE CMA (Chemical and Metallurgical Assistant) Technical Abilities 2025 22.04.25 Paper-2 Shift-2 Medium +1 -0.33
If the pressure of a gas is doubled while keeping the temperature constant, what happens to its volume?
Correct Answer: C. It becomes half
Explanation: According to Boyle's Law, the pressure and volume of a given mass of gas are inversely proportional when the temperature is held constant ($P \propto 1/V$ or $PV = k$). This relationship implies that if the pressure is increased, the volume must decrease by the same factor to maintain a constant product. Specifically, doubling the pressure ($2P$) results in the volume being reduced to exactly one-half ($V/2$) of its original state. Therefore, when pressure is doubled at a constant temperature, the volume becomes half.
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