Air in a cylinder is suddenly compressed by a piston which is

air-in-a-cylinder-is-suddenly-compressed-by-a-piston-which-is

Air in a cylinder is suddenly compressed by a piston which is then maintained at the same position. After sometime, the ___________

A. Pressure will increase

B. Pressure remains the same

C. Pressure will decrease

D. Pressure may increase or decrease

I got this question during an interview.

Question is from Isothermic and Adiabatic Process in division Kinetic Theory of Gases of Engineering Physics I

Right choice is C. Pressure will decrease

The explanation is: Sudden compression increases inside temperature. After sometime heat flows out. This decreases temperature of the air, As V is constant, so pressure inside decreases.