Last Updated on April 25, 2025 by XAM CONTENT
Hello students, we are providing assertion reason questions for class 11. Assertion Reason questions are the new question format that is introduced in CBSE board. The resources for assertion reason questions are very less. So, to help students we have created chapterwise assertion reason questions for class 11 Physics. In this article, you will find assertion reason questions for CBSE Class 11 Physics Chapter 12 Kinetic Theory. It is a part of Assertion Reason Questions for CBSE Class 11 Physics Series.
| Chapter | Kinetic Theory |
| Type of Questions | Assertion Reason Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Physics |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Physics Chapterwise Assertion Reason |
Assertion Reason Questions on Kinetic Theory
Assertion Reason Questions
Directions:
Each of the following questions consists of two statements: an Assertion (A) and a Reason (R). Answer them by selecting the correct option:
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.
Q1. Assertion (A): The pressure of a gas in a container is due to collisions of gas molecules with the container walls.
Reason (R): The average kinetic energy of gas molecules is directly proportional to the absolute temperature.
Answer: Option (b) is correct.
Explanation: Both statements are true. However, R describes temperature–kinetic energy relation, not pressure. So R is not the correct explanation of A.
Difficulty Level: Moderate
Q2.
Assertion (A): The root mean square (rms) speed of gas molecules increases with temperature.
Reason (R): At higher temperatures, molecules have higher average kinetic energy.
Answer: Option (a) is correct.
Explanation: The rms speed $v_{\mathrm{rms}}=\sqrt{\frac{3 k T}{m}}$, increases with temperature. R explains the reason for increased molecular speed.
Difficulty Level: Moderate
Q3. Assertion (A): In an ideal gas, the intermolecular forces are negligible.
Reason (R): The molecules of an ideal gas are rigid and occupy definite volume.
Answer: Option (c) is correct.
Explanation: While intermolecular forces are assumed negligible in ideal gases (A is true), R is false — ideal gas molecules are treated as point masses with no definite volume.
Difficulty Level: Tough
Q4. Assertion (A): The total kinetic energy of one mole of an ideal monoatomic gas is $\frac{3}{2} R T$.
Reason (R): Each translational degree of freedom contributes $\frac{1}{2} k T$ per molecule to energy.
Answer: Option (a) is correct.
Explanation: A monoatomic gas has 3 translational degrees of freedom. Using $E=\frac{3}{2} k T \times N_A=\frac{3}{2} R T$, both $A$ and $R$ are true, and $R$ correctly explains $A$.
Difficulty Level: Moderate
Q5. Assertion (A): The ratio of specific heats $\gamma=\frac{C_p}{C_v}$ is greater than 1 for ideal gases.
Reason (R): $C_p$ includes the energy required to increase volume against external pressure, unlike $C_v$.
Answer: Option (a) is correct.
Explanation: Since $C_p>C_v$ (more work is done at constant pressure), their ratio $\gamma>1$. R explains why $C_p$ is greater, thus both are true and linked.
Difficulty Level: Moderate
Also check
- Kinetic Theory Class 11 Assertion Reason Questions Physics Chapter 12
- Thermodynamics Class 11 Assertion Reason Questions Physics Chapter 11
- Thermal Properties of Matter Class 11 Assertion Reason Questions Physics Chapter 10
- Mechanical Properties of Fluids Class 11 Assertion Reason Questions Physics Chapter 9
- Mechanical Properties of Solids Class 11 Assertion Reason Questions Physics Chapter 8
- Gravitation Class 11 Assertion Reason Questions Physics Chapter 7
- System of Particles and Rotational Motion Class 11 Assertion Reason Questions Physics Chapter 6
- Work, Energy, and Power Class 11 Assertion Reason Questions Physics Chapter 5
- Laws of Motion Class 11 Assertion Reason Questions Physics Chapter 4
- Motion in a Plane Class 11 Assertion Reason Questions Physics Chapter 3
- Motion in a Straight Line Class 11 Assertion Reason Questions Physics Chapter 3
- Units and Measurements Class 11 Assertion Reason Questions Physics Chapter 2
Topics from which assertion reason questions may be asked
- Assumptions of kinetic theory of gases
- Equation of state of a perfect gas
- Pressure of an ideal gas
Kinetic theory bridges the microscopic behavior of particles with macroscopic properties like temperature and pressure.
Assertion reason questions from the above given topic may be asked.
Frequently Asked Questions (FAQs) on Kinetic Theory Assertion Reason Questions Class 11
Q1: What is the importance of Kinetic Theory in Class 11 Physics?
A1: It forms the basis for various real-life applications and is crucial for JEE/NEET level conceptual clarity.
Q2: Are assertion reason questions asked in CBSE exams?
A2: Yes, CBSE has introduced competency-based formats which include assertion reason questions to test conceptual understanding.
Q3: How to prepare assertion reason questions from Kinetic Theory?
A3: Focus on key definitions, cause-effect relationships, and conceptual reasoning instead of just memorizing facts.
Q4: Can numerical topics appear in assertion reason format?
A4: Yes, concepts from numerical topics like laws, formulas, or effects of parameter change are often asked.
Q5: Where can I find more assertion reason questions on Kinetic Theory?
A5: Visit xamcontent.com and physicsgurukul.com for chapterwise assertion reason question collections.
