Moment of Inertia and Torque MCQs
Moment of Inertia and Torque MCQs – Class 11 Physics
Class: CBSE Class 11
Subject: Physics
Section: Motion of System of Particles & Rigid Body
Topic: Moment of Inertia and Torque MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Motion of System of Particles & Rigid Body
Topic: Moment of Inertia and Torque MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. Moment of inertia depends on:
Answer: C
Explanation: Moment of inertia depends on how mass is distributed relative to the axis of rotation.
Explanation: Moment of inertia depends on how mass is distributed relative to the axis of rotation.
Q2. SI unit of moment of inertia:
Answer: B
Explanation: I = Σmr², so unit is kg × m².
Explanation: I = Σmr², so unit is kg × m².
Q3. Torque is rotational equivalent of:
Answer: B
Explanation: Torque causes angular acceleration just like force causes linear acceleration.
Explanation: Torque causes angular acceleration just like force causes linear acceleration.
Q4. SI unit of torque:
Answer: B
Explanation: Torque = Force × perpendicular distance.
Explanation: Torque = Force × perpendicular distance.
Q5. Mathematical expression for torque:
Answer: B
Explanation: Torque is vector product of position vector and force.
Explanation: Torque is vector product of position vector and force.
Q6. Moment of inertia of point mass m at distance r:
Answer: mr².
Q7. Torque is zero when force passes through:
Answer: Axis of rotation.
Q8. Rotational analogue of mass:
Answer: Moment of inertia.
Q9. Torque produces:
Answer: Angular acceleration.
Q10. Dimensional formula of torque:
Answer: ML²T⁻².
Q11. Larger moment of inertia means:
Answer: More resistance to rotation.
Q12. Solid sphere I about centre:
Answer: (2/5)MR².
Q13. Ring I about centre:
Answer: MR².
Q14. Disc I about centre:
Answer: (1/2)MR².
Q15. Parallel axis theorem formula:
Answer: I = Icm + Md².
Q16. Perpendicular axis theorem applies to:
Answer: Plane lamina.
Q17. Torque causes change in:
Answer: Angular momentum.
Q18. Angular analogue of force equation:
Answer: τ = Iα.
Q19. Moment of inertia is:
Answer: Scalar quantity.
Q20. Increasing radius increases I because:
Answer: I ∝ r².
Q21. Torque maximum when angle between r and F:
Answer: 90°.
Q22. Moment of inertia minimum when axis passes through:
Answer: Centre of mass.
Q23. Torque changes direction of:
Answer: Angular velocity.
Q24. Door opens easily when force applied:
Answer: Farther from hinges.
Q25. Moment of inertia does not depend on:
Answer: Angular speed.
Q26. Torque vector direction given by:
Answer: Right-hand rule.
Q27. Greater I means angular acceleration:
Answer: Smaller.
Q28. Unit of angular acceleration:
Answer: rad/s².
Q29. Torque zero implies:
Answer: Angular momentum constant.
Q30. Flywheel usefulness due to:
Answer: Large moment of inertia.