SAT Subject Physics Practice Question 484: Answer and Explanation
15. Which of the following best describes the condition of an enclosed gas during an adiabatic compression?
A. The internal energy of the gas increases.
B. Work is done by the gas.
C. Work is done on the gas.
D. The gas remains at a constant temperature.
E. The temperature of the gas decreases
Correct Answer: C
The correct answer is (C). An adiabatic process is one during which no heat enters or leaves the system. Work is done on the system (the compression of the gas) that keeps the heat content of the system constant.