# Kinetic Theory - Multiple Choice Questions

Q1. A diving bell of internal volume 6.0 m3 is lowered into a fresh water lake until the volume of the contained air is 4.0 m3.

The height of the water barometer at the surface is 10 m.

Assuming the temperature of the air in the bell does not change, the depth in metres below the surface of the lake of the surface of the water in the bell is:

 A 5 B 20/3 C 15 D 50/3 E 25

Q2. A gas molecule of mass m moving at velocity u collides at right angles with the side of a container and rebounds elastically.

Which one of the following statements concerning the motion of the molecule is incorrect?

 A The magnitude of the change in momentum of the molecule is zero. B The magnitude of the change in momentum of the molecule is 2mu. C The force exerted by the molecule on the side of the container is equal to the force exerted by the container on the molecule. D The change in kinetic energy of the molecule is zero.

Q3. The composition of a carbon dioxide (CO2) molecule is one atom of and two atoms of .

What is the number of molecules of CO2 in 2.2 kg of the gas?

 A 1.0 × 1022 B 3.0 × 1022 C 3.0 × 1025 D 4.7 × 1025

Q4. What is the total internal energy of 2.4 mol of an ideal gas which has a temperature of 15 °C?

 A 6.0 × 10−21 J B 1.4 × 10−20 J C 4.5 × 102 J D 8.6 × 103 J