Chapter-6: Work, Energy And Power |

1. The commercial unit of energy is-

- Watt
- Joule
- Kilowatt-hour
- None of these

2. The product of force and displacement is called –

- Energy
- Momentum
- Power
- Work

3. Work will be said not to be done if the force and displacement are –

- parallel
- acting in the opposite direction
- perpendicular
- None of these

4. Energy is-

- the capacity for doing work
- rate of doing work
- change of work
- None of these

5. Potential energy of an object of mass ‘m’ at a height ‘h’ is –

- 1/2mv²
- m²gh
- mgh
- mg

6. The expression of kinetic energy is –

- 1/2mv²
- m²gh
- mgh
- mg

7. Out of the following, which is not the unit of energy –

- Joule
- Calorie
- Kilo-Watt
- Electron-Volt

8. Joule is a unit of –

- Work and Power
- Power and Energy
- Force
- Work and Energy.

9. Area under the Force-Displacement curve represents –

- Velocity
- Impulse
- Acceleration
- Work done

10. The momentum of a body increased by 25%, then kinetic energy is increased by about –

- 25 %
- 56 %
- 5 %
- 38 %

11. The rate of doing work is called –

- energy
- force
- power
- pressure

12. What will be the kinetic energy of a substance when its velocity is doubled?

- Double
- Four times
- Half
- One-fourth

13. What will be the kinetic energy of a body when its velocity is halved?

- Double
- Four times
- Half
- One-fourth

14. Watt is the unit of the following –

- Work
- Power
- Energy
- None of these

15. If the velocity of a body becomes double then its kinetic energy becomes –

- Double
- Four times
- Half
- One-fourth