Question

Air in a cylinder is suddenly compressed by a piston which is then maintained at the same position. As the time passes pressure of the gas

• A. increases
• B. decreases
• C. remains the same
• D. may increase or decrease depending on the nature of the gas

Answer 1

The correct option is B decreases

The Pressure of the gas on the cylinder will try to balance the weight of the piston.
If compressed and left, the pressure would relieve itself until it is balancing the pistons weight.
Hence pressure would decrease.