CAPE Physics Unit 1 · 2011 · Paper 1 · Question Q36

Gas in an enclosed system is allowed to expand with no thermal energy entering or leaving the system. Which of the following statements is true?

1. (A)The temperature of the gas decreases as work is done by the gas.
2. (B)Work is done by the gas so the kinetic energy of the gas molecules increases.
3. (C)The internal energy of the gas increases as work is done on the gas.
4. (D)No heat enters the system so the temperature of the gas remains constant.