PHYSICS-Kinetic Theory of Gases Questions and Answers
Practice ModeShowing 10 of 20 questions
Q11
What is the effect on pressure if number of molecules is doubled at constant volume and temperature?
Answer: Option B
Explanation: According to ideal gas law, pressure is directly proportional to number of molecules.
Q12
The constant in Charles' law is:
Answer: Option C
Explanation: Charles' law: V/T = constant at constant pressure.
Q13
What is the dimensional formula for universal gas constant R?
Answer: Option B
Explanation: From PV = nRT, R = PV/nT. Dimensions: [ML²T⁻²K⁻¹mol⁻¹].
Q14
Which gas deviates most from ideal behavior at high pressure?
Answer: Option C
Explanation: CO₂ deviates significantly due to intermolecular forces and molecular size.
Q15
The mean free path of gas molecules:
Answer: Option B
Explanation: Mean free path is inversely proportional to pressure and collision cross-section.
Q16
According to kinetic theory, pressure exerted by gas is due to:
Answer: Option B
Explanation: Pressure results from molecular collisions with container walls.
Q17
What is the ratio of most probable speed to RMS speed?
Answer: Option A
Explanation: Most probable speed = √(2RT/M), RMS speed = √(3RT/M). Ratio = √(2/3).
Q18
At same temperature, which gas has highest average speed?
Answer: Option C
Explanation: Lighter molecules have higher average speed at same temperature.
Q19
The law of equipartition of energy states that:
Answer: Option C
Explanation: Equipartition theorem: energy is equally distributed among all degrees of freedom.
Q20
What happens to the density of gas when pressure is doubled at constant temperature?
Answer: Option B
Explanation: From ideal gas law, density is proportional to pressure at constant temperature.