Rotational Motion MCQs for Class 11 Physics
Rotational Motion MCQs for Class 11 Physics
Class: CBSE Class 11
Subject: Physics
Section: Motion of System of Particles & Rigid Body
Topic: Rotational Motion MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Motion of System of Particles & Rigid Body
Topic: Rotational Motion MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. Angular displacement unit:
Answer: Radian
Explanation: SI unit of angular displacement is radian.
Explanation: SI unit of angular displacement is radian.
Q2. Angular velocity unit:
Answer: rad/s
Explanation: ω = dθ/dt.
Explanation: ω = dθ/dt.
Q3. Relation between linear & angular velocity:
Answer: v = rω
Explanation: Linear speed proportional to radius.
Explanation: Linear speed proportional to radius.
Q4. Moment of inertia depends on:
Answer: Mass distribution
Explanation: I = Σmr².
Explanation: I = Σmr².
Q5. SI unit of torque:
Answer: N·m
Explanation: Torque = Force × perpendicular distance.
Explanation: Torque = Force × perpendicular distance.
Q6. Rotational analogue of force:
Answer: Torque.
Q7. Rotational analogue of mass:
Answer: Moment of inertia.
Q8. Angular momentum formula:
Answer: L = Iω.
Q9. Conservation of angular momentum when:
Answer: Net external torque zero.
Q10. Ice skater spins faster by:
Answer: Reducing moment of inertia.
Q11. Rolling motion energy:
Answer: Translational + Rotational KE.
Q12. KE of rotation:
Answer: ½ Iω².
Q13. Torque dimension:
Answer: ML²T⁻².
Q14. Solid sphere I about centre:
Answer: 2/5 MR².
Q15. Ring I about centre:
Answer: MR².
Q16. Disc I about centre:
Answer: ½ MR².
Q17. Parallel axis theorem:
Answer: I = Icm + Md².
Q18. Perpendicular axis theorem applies to:
Answer: Plane lamina.
Q19. Angular acceleration unit:
Answer: rad/s².
Q20. Torque causes:
Answer: Angular acceleration.
Q21. L dimension:
Answer: ML²T⁻¹.
Q22. Rolling without slipping:
Answer: v = rω.
Q23. Work by torque:
Answer: τθ.
Q24. Flywheel stores energy as:
Answer: Rotational KE.
Q25. Angular momentum conserved in:
Answer: Isolated system.
Q26. Moment of inertia scalar/vector?
Answer: Scalar.
Q27. Torque zero when force passes through:
Answer: Axis.
Q28. Rotational Newton’s law:
Answer: τ = Iα.
Q29. Radius increases → I:
Answer: Increases.
Q30. Rotational KE depends on:
Answer: I and ω².
