MSCQs of Chapter 7 – Work, Energy and Power

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Fill in the Blanks

1. The nature of work is positive when the force and displacement are in the __________ direction.

2. The dot product of force and velocity is called __________.

3. Work is __________ product of force and displacement.

4. Power is a __________ quantity.

5. Work is a __________ quantity.

6. When the force and displacement are in the same direction then the work is __________.

7. When the force and displacement are in the same direction then the work is __________.

8. The ability of a body to perform the work is called its __________.

9. The rate of doing work of a body is called its __________.

10. Work energy equation is simply the law of conservation of __________.

11. One joule is equal to __________ erg.

12. The unit of power is __________.

13. The unit of energy of elementary particles and atoms is __________.

14. The energy possessed by a body by the virtue of its motion is called the __________ energy.

15. The potential energy of a body is due to its change of __________.

16. The work done against the gravitation field is always __________.

17. The law of conservation of energy states that __________ can neither be created nor destroyed but it can changed its form.

18. The rate of change of momentum multiplied by displacement is called __________.

19. Work done in the gravitation field is __________ of the path followed.

20. Work done in the gravitation field along a closed path is equal to __________.

21. The source of tidal energy is the rotation of the earth around the __________.

22. The source of geothermal energy is the __________ in the earth’s interior.

23. The source of nuclear energy is __________ in heavy nucleus.

24. Einstein mass energy equation is E = __________.

25. The unit of energy is the same as the unit of __________.

26. The dimensions of work are __________.

27. ML2T-3 are the dimensions of __________.

28. The rate of expenditure of energy is called __________.

29. The amount of work done in lifting a body from the surface of the earth to the zero point is called __________ energy.

30. One horsepower is equal to __________ watt.

31. One horsepower is equal to __________ ft.lb/s

32. The expression for absolute gravitational potential energy is __________.

33. 1 electron volt = joule.

34. 1 giga watt (GW) = __________ W.

35. 1 Kilowatt hour (1kWh) = __________ joules.

 

sely p�ri����he __________ of the radius of the earth.

 

24. If the mass of earth becomes four times then the value of ‘g’ will be __________.

25. The acceleration due to gravity on moon is __________ the acceleration due to gravity on the surface of the earth.

26. Acceleration due to gravity at the centre of the earth is __________.

27. The weight of a body at the pole is __________ than at equator.

28. The gravitational pull at equator is __________ than at poles.

29. The force required to prevent a body from falling or accelerating in a frame of reference is called the __________ of the body.

30. An astronaut in a satellite orbiting around the earth experiences a state of __________ because the satellite orbiting with a centripetal acceleration equal to ‘g’.

31. Artificial gravity is produced in the satellite to overcome the __________ in the satellite.

32. Artificial gravity is produced in the satellite by __________ it about its own axis.

33. The value of the average density of the earth is __________ kg/m3.

34. The dimension of gravitation constant is __________.

35. The expression for the frequency of rotation of the satellite to produce artificial gravity is __________.

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