Centre of Mass and Momentum MCQs
Centre of Mass and Momentum MCQs
Class: CBSE Class 11
Subject: Physics
Section: Motion of System of Particles & Rigid Body
Topic: Centre of Mass and Momentum MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Motion of System of Particles & Rigid Body
Topic: Centre of Mass and Momentum MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. Centre of mass depends on:
Answer: B
Explanation: COM position determined by how mass is distributed.
Explanation: COM position determined by how mass is distributed.
Q2. For symmetric body, COM lies at:
Answer: Geometric center
Explanation: Due to uniform mass symmetry.
Explanation: Due to uniform mass symmetry.
Q3. Unit of momentum:
Answer: Both
Explanation: 1 N·s = 1 kg·m/s.
Explanation: 1 N·s = 1 kg·m/s.
Q4. Momentum formula:
Answer: mv
Explanation: Linear momentum p = mv.
Explanation: Linear momentum p = mv.
Q5. COM of ring lies at:
Answer: Centre
Explanation: Symmetry of ring.
Explanation: Symmetry of ring.
Q6. Momentum conserved when:
Answer: Net external force zero.
Q7. COM motion governed by:
Answer: External forces only.
Q8. Rocket motion uses:
Answer: Momentum conservation.
Q9. COM of uniform rod:
Answer: Midpoint.
Q10. Momentum dimension:
Answer: MLT⁻¹.
Q11. If velocity doubles momentum:
Answer: Doubles.
Q12. COM may lie outside in:
Answer: Hollow bodies.
Q13. Impulse equals:
Answer: Change in momentum.
Q14. COM of triangle lamina:
Answer: Intersection of medians.
Q15. Linear momentum conserved in:
Answer: All collisions.
Q16. SI unit of impulse:
Answer: Ns.
Q17. COM of semicircle:
Answer: On symmetry axis.
Q18. System momentum equals:
Answer: Vector sum of individual momenta.
Q19. COM acceleration proportional to:
Answer: External force.
Q20. If net force zero COM:
Answer: Moves uniformly.
Q21. Momentum scalar/vector?
Answer: Vector.
Q22. COM of sphere:
Answer: Centre.
Q23. Rate of change momentum:
Answer: Force.
Q24. Momentum zero when:
Answer: Velocity zero.
Q25. COM depends on coordinate system?
Answer: No.
Q26. Explosion obeys:
Answer: Momentum conservation.
Q27. Internal forces affect COM motion?
Answer: No.
Q28. COM useful for:
Answer: Simplifying motion analysis.
Q29. Momentum conserved in isolated system?
Answer: Yes.
Q30. COM of hollow sphere:
Answer: Centre.
