Kinetic Theory Practice Questions
Class 11 · Physics · 1769 free MCQs with instant results and detailed explanations.
1769
Total
589
Easy
873
Medium
307
Hard
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Topics in Kinetic Theory
Kinetic Theory of Gases
534
Law of Equipartition
361
Molecular Theory
503
Mean Free Path
371
Sample Questions from Kinetic Theory
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What does the Kinetic Molecular Theory primarily explain?
A.
The behavior of solids
B.
The behavior of liquids
C.
The behavior of gases
D.
The behavior of plasma
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Correct Answer: C
Kinetic Molecular Theory is focused on explaining the properties and behaviors of gases in terms of molecular motion.
Q2
Easy
Which of the following postulates is NOT part of the Kinetic Molecular Theory?
A.
Gas particles are in constant random motion
B.
Gas particles collide elastically
C.
Gas particles have significant volume
D.
There are no attractive forces between gas particles
Show Answer & Explanation
Correct Answer: C
The Kinetic Molecular Theory assumes that gas particles have negligible volume compared to the volume of the container.
Q3
Easy
According to the Kinetic Molecular Theory, what happens to gas particle speed as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show Answer & Explanation
Correct Answer: A
As temperature increases, the kinetic energy of gas particles increases, resulting in higher speeds.
Q4
Medium
Which of the following statements about the kinetic theory of gases is TRUE?
A.
Gas molecules have significant intermolecular forces.
B.
Gas molecules are in constant random motion.
C.
Gas volume is always significantly smaller than the container volume.
D.
Gas density increases with increase in temperature.
Show Answer & Explanation
Correct Answer: B
According to the kinetic theory, gas molecules are always in constant random motion, which is a fundamental principle of the theory.
Q5
Medium
If the temperature of a gas increases while the volume remains constant, what happens to the pressure?
A.
Pressure decreases.
B.
Pressure remains constant.
C.
Pressure increases.
D.
Pressure fluctuates.
Show Answer & Explanation
Correct Answer: C
According to Gay-Lussac's law, if the volume is constant, an increase in temperature leads to an increase in pressure.
Q6
Medium
The average speed of gas molecules is inversely proportional to which of the following?
A.
Temperature
B.
Molar mass
C.
Pressure
D.
Volume
Show Answer & Explanation
Correct Answer: B
According to the kinetic theory, the average speed is inversely related to the square root of the molar mass of the gas.
Q7
Medium
What happens to the pressure of a gas if its volume is halved at constant temperature?
A.
Pressure is halved.
B.
Pressure doubles.
C.
Pressure remains constant.
D.
Pressure increases by a factor of three.
Show Answer & Explanation
Correct Answer: B
According to Boyle's Law, if volume decreases, pressure increases inversely; halving the volume doubles the pressure.
Q8
Hard
What is the average kinetic energy of a gas molecule at absolute zero temperature?
A.
Zero
B.
1.5 kT
C.
3 kT
D.
Infinity
Show Answer & Explanation
Correct Answer: A
At absolute zero, the temperature is 0 K, which means the kinetic energy of the molecules comes to a halt, resulting in zero average kinetic energy.
Q9
Hard
According to the Kinetic Theory of Gases, which of the following statements is FALSE?
A.
Gas molecules are in constant random motion.
B.
Gas particles occupy a definite volume.
C.
Collisions between gas molecules are perfectly elastic.
D.
The average distance between gas molecules is large.
Show Answer & Explanation
Correct Answer: B
Gas particles do not occupy a definite volume; instead, they fill the entire container they are in, as they are compressible.
Q10
Hard
If the temperature of an ideal gas is doubled, what happens to the average kinetic energy of its molecules?
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
Show Answer & Explanation
Correct Answer: B
The average kinetic energy of gas molecules is directly proportional to the temperature in Kelvin. Doubling the temperature results in doubling the kinetic energy.
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Kinetic Theory — Class 11 Physics Practice Questions Online
This page contains 1769 practice MCQs for the chapter Kinetic Theory in Class 11 Physics. The questions are organized by difficulty — 589 easy, 873 medium, 307 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.