Unit 14: Kinetic Theory — Online MCQ Test
PHYSICS · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board
Practice Unit 14: Kinetic Theory with a free chapter-wise online MCQ test.
This chapter covers: The final chapter examines molecular nature of matter gas laws ideal gas kinetic theory postulates pressure expression degrees of freedom law of equipartition of energy and mean fr....
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Unit 14: Kinetic Theory — Important Questions & Answers
According to the kinetic theory of gases, the pressure of a gas is mainly due to the _____ of its molecules with the container walls.
- A. gravitational attraction
- B. collision
- C. diffusion
- D. rotation
Answer: B. collision
Gas pressure arises from repeated collisions of molecules with the walls of the container.
Gas pressure arises from repeated collisions of molecules with the walls of the container.
Which of the following is an assumption of the ideal gas model?
- A. Molecules have significant intermolecular attraction at all distances
- B. Molecules occupy negligible volume compared to the gas volume
- C. Molecules move only in circular paths
- D. Gas pressure is independent of temperature
Answer: B. Molecules occupy negligible volume compared to the gas volume
In an ideal gas, the volume of the molecules is assumed to be negligible compared to the container volume.
In an ideal gas, the volume of the molecules is assumed to be negligible compared to the container volume.
Which of the following is NOT a postulate of the kinetic theory of gases?
- A. Gas molecules are in continuous random motion
- B. Collisions between molecules are perfectly elastic
- C. Molecules exert strong long-range forces on each other
- D. The average kinetic energy depends on temperature
Answer: C. Molecules exert strong long-range forces on each other
Kinetic theory assumes intermolecular forces are negligible except during collisions, not strong long-range forces.
Kinetic theory assumes intermolecular forces are negligible except during collisions, not strong long-range forces.
Which expression represents the pressure of an ideal gas according to kinetic theory?
- A. P = \u22121/3 nm\u27e8v^2\u27e9
- B. P = 1/3 nm\u27e8v^2\u27e9
- C. P = nm\u27e8v\u27e9
- D. P = 3nm\u27e8v\u27e9
Answer: B. P = 1/3 nm\u27e8v^2\u27e9
The kinetic theory expression for gas pressure is P = (1/3)nm⟨v²⟩, where n is number density and m is molecular mass.
The kinetic theory expression for gas pressure is P = (1/3)nm⟨v²⟩, where n is number density and m is molecular mass.
Which of the following changes will increase the mean free path of a gas molecule most directly?
- A. Increasing the gas pressure at constant temperature
- B. Decreasing the molecular diameter at constant temperature and pressure
- C. Increasing the number density at constant temperature
- D. Reducing the container volume at constant number of molecules
Answer: B. Decreasing the molecular diameter at constant temperature and pressure
Mean free path is inversely related to molecular size and number density. Smaller molecular diameter means fewer effective collisions and hence larger mean free path.
Mean free path is inversely related to molecular size and number density. Smaller molecular diameter means fewer effective collisions and hence larger mean free path.