CBSE Class 11 Physics Kinetic Theory MCQs

Question: Kinetic theory of gases provide a base for

a) Both Charle’s law and Boyle’s law

b) None of these

c) Boyle’s law

d) Charle’s law

Answer: Both Charle’s law and Boyle’s law

Question: When do real gases approach the ideal gas behaviour ?

a) At low pressure and high temperature

b) At high pressure and high temperature

c) At high pressure and low temperature

d) At low pressure and low temperature

Answer: At low pressure and high temperature

Question: According to the kinetic theory of gases, the pressure exerted by a gas on the wall of the container is measured as

a) rate of change of momentum imparted to the walls per second per unit area

b) momentum imparted to the walls per unit area

c) change of momentum imparted to the walls per unit area

d) change in momentum per unit volume

Answer: rate of change of momentum imparted to the walls per second per unit area

Question: When a gas is in thermal equilibrium, its molecules

a) have the same average kinetic energy of molecules

b) have different energies which remain constant

c) have a certain constant energy

d) do not collide with one another

Answer: have the same average kinetic energy of molecules

Question: Molecules of a ideal gas behave like

a) perfectly elastic rigid sphere

b) inelastic non-rigid sphere

c) perfectly elastic non-rigid sphere

d) inelastic rigid sphere

Answer: perfectly elastic rigid sphere

Question: In kinetic theory of gases, it is assumed that molecules

a) have same mass but negligible volume

b) have different mass as well as volume

c) have same volume but mass can be different

d) have same mass but can have different volume

Answer: have same mass but negligible volume

Question: The internal energy of a gram-molecule of an ideal gas depends on

a) pressure alone

b) volume alone

c) temperature alone

d) both on pressure as well as temperature

Answer: pressure alone

Question: The phenomenon of Browninan movement may be taken as evidence of

a) kinetic theory of matter

b) electromagnetic theory of radiation

c) corpuscular theory of light

d) photoelectric phenomenon

Answer: kinetic theory of matter

Question: According to kinetic theory of gases, at absolute zero temperature

a) molecular motion stops

b) liquid hydrogen freezes

c) liquid helium freezes

d) water freezes

Answer: molecular motion stops

Question: At a given temperature the force between molecules of a gas as a function of intermolecular distance is

a) first decreases and then increases

b) always increases

c) always decreases

d) always constant

Answer: first decreases and then increases 

Question: For Boyle’s law to hold, the gas should be

a) perfect and of constant mass and temperature

b) real and of constant mass and temperature

c) perfect and constant temperature but variable mass

d) real and constant temperature but variable mass

Answer: perfect and of constant mass and temperature

Question: Boyle' law is applicable for an

a) isothermal process

b) isochoric process

c) adiabatic process

d) isobaric process

Answer: isothermal process

Question: The deviation of gases from the behaviour of ideal gas is due to

a) attraction of molecules

b) absolute scale of temp

c) covalent bonding of molecules

d) colourless molecules

Answer: attraction of molecules

Question: In a mixture of gases at a fixed temperature

a) heavier molecule has lower average speed

b) lighter molecule has lower average speed

c) heavier molecule has higher average speed

d) None of these

Answer: heavier molecule has lower average speed

Question: The average kinetic energy of gas molecules depends upon which of the following factor?

a) Temperature of the gas

b) Nature of the gas

c) Volume of the gas

d) None of these

Answer: Temperature of the gas

Question: The temperature of a gas is a measure of

a) the average kinetic energy of the gaseous molecules

b) the average potential energy of the gaseous molecules

c) the average distance between the molecules of the gas

d) the size of the molecules of the gas

Answer: the average kinetic energy of the gaseous molecules

Question: In the isothermal expansion of 10g of gas from volume V to 2V the work done by the gas is 575J. What is the root mean square speed of the molecules of the gas at that temperature?

a) 499m/s

b) 532m/s

c) 520m/s

d) 398m/s

Answer: 499m/s

Question: In a diatomic molecules, the rotational energy at a given temperature

a) obeys Maxwell’s distribution

b) have the same volue for all molecules

c) equals the translational kinetic energy for each molecule

d) None of these

Answer: obeys Maxwell’s distribution

Question: Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will.

a) remains the same

b) decrease for some and increase for others

c) decrease

d) increase

Answer: remains the same

Question: Pressure exerted by a gas is

a) directly proportional to the density of the gas

b) directly proportional to the square of the density of the gas

c) inversely proportional to the density of the gas

d) independent of density of the gas

Answer: directly proportional to the density of the gas