question_answer 18)

                  A cylinder containing an ideal gas is in vertical position and has a piston of mass M that is able to move up or down without friction (Fig.). If the temperature is increased,                 (a) both  p and V of the gas will change.                 (b) only  p will increase according to Charle's law.                 (c) V will change but not p.                 (d) p will change but not V.

Answer:

                  (c) When temperature is increased, volume will change but pressure remains the same                 \[\left( \because \,P=\,\frac{Mg}{A} \right)\,\]