The following statements are given:
(1) The average kinetic energy of a gas molecule decreases when the temperature is reduced.
(2) The average kinetic energy of a gas molecule increases with increase in pressure at constant temperature.
(3) The average kinetic energy of a gas molecule decreases with increase in volume.
(4) Pressure of a gas increases with increase in temperature at constant volume.
(5) The volume of gas decreases with increase in temperature.
Choose the correct answer from the options given below:
Answer: (A) (1) and (4) only
Average kinetic energy per molecule $= \dfrac32kT$ depends only on temperature, so (1) is true while (2) and (3) are false.
At constant volume $P\propto T$, so (4) is true. At constant pressure the volume increases with temperature, so (5) is false.
Solution by Sreeraj P, M.Sc Physics