MCAT Physics Question 20: Answer and Explanation
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Question: 20
5. 5 m3 of a gas are brought from an initial pressure of 1 kPa to a pressure of 3 kPa through an isochoric process. During this process, the work performed by the gas is:
- A. –10 kJ
- B. –10 J
- C. 0 J
- D. +10 kJ
Correct Answer: C
Explanation:
An isochoric process, by definition, is one in which the gas system undergoes no change in volume. If the gas neither expands nor is compressed, then no work is performed. Remember that work in a thermodynamic system is the area under a P–V curve; if the change in volume is 0, then the area under the curve is also 0.