Power and Collision Based MCQs
Power and Collision Based MCQs
Class: CBSE Class 11
Subject: Physics
Section: Work, Energy and Power
Topic: Power and Collision Based MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Work, Energy and Power
Topic: Power and Collision Based MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. Power is defined as:
Answer: B
Explanation: Power = Rate of doing work = W/t.
Explanation: Power = Rate of doing work = W/t.
Q2. SI unit of power:
Answer: Watt
Explanation: 1 W = 1 J/s.
Explanation: 1 W = 1 J/s.
Q3. Commercial unit of power:
Answer: Horsepower
Explanation: 1 HP = 746 W.
Explanation: 1 HP = 746 W.
Q4. A fast worker has:
Answer: More power
Explanation: Same work in less time → more power.
Explanation: Same work in less time → more power.
Q5. Collision means:
Answer: B
Explanation: Collision = Short-time interaction.
Explanation: Collision = Short-time interaction.
Q6. Momentum conserved in:
Answer: C
Explanation: Momentum always conserved.
Explanation: Momentum always conserved.
Q7. KE conserved in:
Answer: Elastic collision
Explanation: Both KE & momentum conserved.
Explanation: Both KE & momentum conserved.
Q8. Perfectly inelastic collision:
Answer: Bodies stick
Explanation: Maximum KE loss.
Explanation: Maximum KE loss.
Q9. Unit of momentum:
Answer: kg·m/s.
Q10. Collision time is:
Answer: Very small.
Q11. Impulse equals:
Answer: Change in momentum.
Q12. SI unit of impulse:
Answer: Ns.
Q13. Recoil of gun type:
Answer: Inelastic collision.
Q14. Billiard ball hit example:
Answer: Elastic collision.
Q15. Momentum conserved when net force:
Answer: Zero.
Q16. KE loss max in:
Answer: Perfectly inelastic.
Q17. Power formula (force & velocity):
Answer: P = Fv.
Q18. Energy unit kWh equals:
Answer: 3.6 × 10⁶ J.
Q19. Collision obeys:
Answer: Momentum conservation.
Q20. Rocket motion uses:
Answer: Momentum conservation.
Q21. Power dimension:
Answer: ML²T⁻³.
Q22. KE conserved ⇒ collision:
Answer: Elastic.
Q23. Car crash type:
Answer: Inelastic.
Q24. Impulse increases when time:
Answer: Increases.
Q25. Worker lifting faster has:
Answer: Greater power.
Q26. Momentum formula:
Answer: p = mv.
Q27. Collision force large because time:
Answer: Very small.
Q28. Perfect elastic collision KE:
Answer: Conserved.
Q29. Power rate of energy:
Answer: Transfer.
Q30. Momentum dimension:
Answer: MLT⁻¹.
