# CBSE Class 11 Physics Kinetic Theory MCQs

## Kinetic Theory Class 11 Physics MCQ

Class 11 Physics students should refer to the following multiple-choice questions with answers for Kinetic Theory in standard 11. These MCQ questions with answers for Grade 11 Physics will come in exams and help you to score good marks

### Kinetic Theory MCQ Questions Class 11 Physics with Answers

#### 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

#### 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

#### 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

#### 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

#### 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
• d) isobaric 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

#### 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

#### 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

• a) 499m/s
• b) 532m/s
• c) 520m/s
• d) 398m/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

#### 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

#### 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

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