Work, Energy and Power – Power, Collisions (Elastic & Inelastic)

Grade 11 Physics — Work, Energy and Power – Power, Collisions (Elastic & Inelastic): 25 practice questions with instant scoring and explanations.

1. Power is defined as:
2. SI unit of power is:
3. 1 horsepower equals approximately:
4. Average power = :
5. Instantaneous power P equals:
6. Dimensions of power:
7. A pump lifts 100 kg of water per second to height 10 m (g=10). Power:
8. 1 kilowatt-hour equals:
9. Collision in which KE is conserved is called:
10. In inelastic collision:
11. Perfectly inelastic collision means:
12. Momentum is conserved in:
13. Coefficient of restitution for perfectly elastic collision is:
14. Coefficient of restitution for perfectly inelastic collision is:
15. Two identical balls, one at rest, undergo head-on elastic collision. After collision:
16. In elastic collision between two equal masses where one is at rest, they:
17. A 2 kg body at 5 m/s collides head-on with 3 kg at rest, sticking together. Final speed:
18. Coefficient of restitution e is defined as:
19. A ball falls from height h, rebounds to h'. e equals:
20. When a bullet embeds in a block, the collision is:
21. Loss in KE in perfectly inelastic collision of two equal masses (one at rest) is:
22. A machine does 600 J of work in 20 s. Power is:
23. Average power × time equals:
24. Which is not a unit of power?
25. If power = 100 W and velocity = 10 m/s, force is: