Last Updated on June 5, 2025 by XAM CONTENT
Mastering the important concepts in Class 11 Physics Chapter 6 – System of Particles and Rotational Motion is essential for scoring high marks in your exams. That’s why we’ve put together chapterwise multiple-choice questions (MCQs) with answers to help you revise effectively and boost your confidence. It is a part of MCQ Questions for CBSE Class 11 Physics Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these System of Particles and Rotational Motion MCQs will strengthen your conceptual clarity.
| Chapter | System of Particles and Rotational Motion |
| Book | Physics for Class 11 |
| Type of Questions | MCQ 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 MCQ Questions |
MCQ Questions on System of Particles and Rotational Motion Class 11 Physics (PDF Download)
MCQs
Q1. In a collision between two particles, which condition ensures that the centre of mass remains stationary?
(a) Equal masses
(b) Equal speeds
(c) Total external force is zero
(d) Total kinetic energy is conserved
Show Answer
Answer: (c)
Explanation: The centre of mass remains stationary only when the net external force is zero.
Q2. For a uniform disc rolling without slipping, what is the ratio of rotational KE to total KE?
(a) 1:2
(b) 1:1
(c) 2:3
(d) 1:3
Show Answer
Answer: (c)
Explanation: Rotational KE = (1/2)Iω² = (1/4)mv²; Total KE = (1/2)mv² + (1/4)mv² = (3/4)mv². Ratio = 1/4 ÷ 3/4 = 1:3.
Q3. A body of mass m and radius R is rolling without slipping. Which point has zero velocity at an instant?
(a) Topmost point
(b) Centre
(c) Point of contact with ground
(d) Midpoint between top and centre
Show Answer
Answer: (c)
Explanation: In pure rolling, the point of contact is instantaneously at rest.
Q4. For a system of particles with internal forces only, the total angular momentum is:
(a) Conserved
(b) Zero
(c) Increasing
(d) Decreasing
Show Answer
Answer: (a)
Explanation: Internal forces do not contribute to torque; hence angular momentum is conserved.
Q5. The moment of inertia of a solid sphere about its diameter is:
(a) (2/5)MR²
(b) (1/2)MR²
(c) (3/5)MR²
(d) (5/2)MR²
Show Answer
Answer: (a)
Explanation: Standard result for moment of inertia of a solid sphere about its diameter.
Q6. A uniform rod is rotated about an axis through one end perpendicular to its length. What is its moment of inertia?
(a) (1/3)ML²
(b) (1/2)ML²
(c) (1/12)ML²
(d) (2/3)ML²
Show Answer
Answer: (a)
Explanation: For rotation about one end, I = (1/3)ML².
Q7. The direction of angular momentum is:
(a) Opposite to torque
(b) Along angular velocity
(c) Perpendicular to linear velocity
(d) Radial from axis
Show Answer
Answer: (b)
Explanation: In rigid body rotation, angular momentum is aligned with angular velocity.
Q8. Which of the following quantities remains unchanged in an inelastic collision?
(a) Kinetic energy
(b) Total energy
(c) Angular momentum
(d) Potential energy
Show Answer
Answer: (c)
Explanation: Angular momentum is conserved in the absence of external torque.
Q9. A uniform disc is rotating freely. What happens to angular momentum if mass distribution is changed symmetrically?
(a) Increases
(b) Decreases
(c) Remains same
(d) Becomes zero
Show Answer
Answer: (c)
Explanation: Without external torque, angular momentum remains constant.
Q10. Which one is correct about the torque acting on a rigid body?
(a) Always zero
(b) Always causes angular acceleration
(c) Depends on axis of rotation
(d) Equal to linear momentum
Show Answer
Answer: (c)
Explanation: Torque depends on the position vector from the axis of rotation.
Q11. A flywheel rotating at constant angular speed has:
(a) Zero angular acceleration
(b) Increasing torque
(c) Decreasing kinetic energy
(d) Constant angular displacement
Show Answer
Answer: (a)
Explanation: Constant angular speed implies zero angular acceleration.
Q12. In rotational motion, which quantity plays the same role as mass in linear motion?
(a) Torque
(b) Moment of inertia
(c) Angular momentum
(d) Angular acceleration
Show Answer
Answer: (b)
Explanation: Moment of inertia determines rotational inertia, like mass in linear motion.
Q13. A symmetric top spins in place. Its centre of mass remains:
(a) Stationary
(b) Rotating
(c) Accelerating
(d) Moving in circles
Show Answer
Answer: (a)
Explanation: In spinning, the centre of mass remains fixed if the top doesn’t precess.
Q14. The torque on a particle is zero when:
(a) Force acts along radius vector
(b) Force is perpendicular to velocity
(c) Particle is at rest
(d) Force is maximum
Show Answer
Answer: (a)
Explanation: Torque = r × F; if r and F are collinear, torque = 0.
Q15. Which has greater moment of inertia about the central axis?
(a) Ring
(b) Disc
(c) Solid sphere
(d) Rod
Show Answer
Answer: (a)
Explanation: A ring has all mass farthest from axis, so maximum I.
Q16. Which of these quantities is NOT conserved in general rotational motion?
(a) Angular momentum
(b) Torque
(c) Energy
(d) Moment of inertia
Show Answer
Answer: (b)
Explanation: Torque is an applied force and not generally conserved.
Q17. A force applied tangentially to a wheel causes:
(a) Pure translation
(b) Rolling without slipping
(c) Pure rotation
(d) Centripetal force
Show Answer
Answer: (c)
Explanation: Tangential force induces torque and causes rotation.
Q18. For a disc rotating about its centre, angular momentum depends on:
(a) Mass only
(b) Radius only
(c) Angular velocity only
(d) Mass, radius and angular velocity
Show Answer
Answer: (d)
Explanation: L = Iω = (1/2)MR²ω.
Q19. The radius of gyration is the distance from axis where:
(a) All mass is assumed to be concentrated
(b) Velocity is maximum
(c) Torque is minimum
(d) Acceleration is zero
Show Answer
Answer: (a)
Explanation: Radius of gyration is the effective distance from axis of rotation.
Q20. Which of the following statements is true?
(a) Torque is scalar
(b) Angular velocity is always variable
(c) Rolling is combination of rotation and translation
(d) Moment of inertia is a vector
Show Answer
Answer: (c)
Explanation: Rolling motion involves both rotation and translation.
We hope the given mcq questions with Answers for System of Particles and Rotational Motion Class 11 helps you in your learning.
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Topics from which mcq questions may be asked
- Center of mass
- Torque and angular momentum
- Moment of inertia
Rotation introduces us to deeper concepts of balance and moment of inertia.
Frequently Asked Questions (FAQs) on System of Particles and Rotational Motion MCQ Questions
Q1: What is the best way to prepare for Class 11 Physics MCQ questions?
A1: The best way is to study NCERT concepts thoroughly, practice topicwise MCQs regularly, and focus on understanding fundamental principles rather than rote learning. Solving previous year MCQs and mock tests can boost accuracy and speed.
Q2: Are NCERT questions enough for Class 11 Physics MCQ-based exams?
A2: NCERT forms the base for all CBSE Physics MCQs. However, for better preparation, students should solve additional MCQs from reference books and practice HOTS and competency-based questions to develop deeper conceptual clarity.
Q3: Where can I find chapterwise Class 11 Physics MCQ questions with answers?
A3: You can find chapterwise MCQ questions with answers and detailed explanations on trusted educational platforms like xamcontent.com and physicsgurukul.com. These cover both basic and advanced-level questions.
Q4: Do CBSE Class 11 exams include MCQs?
A4: Yes, as per the latest CBSE exam pattern, objective questions, including MCQs, are part of the final exam paper. MCQs test conceptual understanding and application skills.
Q5: How to score high in Class 11 Physics MCQs?
A5: To score high, understand the theory from NCERT, solve a variety of MCQs (basic, conceptual, numerical), and regularly revise formulas and diagrams. Avoid guesswork and focus on time management during tests.
Q6: What are competency-based MCQs in Class 11 Physics?
A6: Competency-based MCQs assess a student’s ability to apply concepts in real-life or unfamiliar scenarios. These questions go beyond textbook definitions and require logical reasoning and application of physics principles.
