Question

A perfect gas is contained in a cylinder kept in vacuum. If the cylinder suddenly bursts, then the temperature of the gas ___________

(a) Becomes zero K

(b) Is decreased

(c) In increased

(d) Remains unchanged

This question was addressed to me at a job interview.

The origin of the question is Thermodynamics topic in division Kinetic Theory of Gases of Engineering Physics I

Answer 1

Correct option is (d) Remains unchanged

Easiest explanation: No work is done during the free expansion of a gas. There is no change in internal energy or temperature of the gas.