CHAPTER-6: WORK, ENERGY, AND POWER

 

1. The commercial unit of energy is-

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

View Answer

Kilowatt-hour

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

View Answer

acting in the opposite direction

4. Energy is-

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

View Answer

the capacity for doing work

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

6. The expression of kinetic energy is –

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.

View Answer

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 –

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