Physics XI Karachi Board Fill in the Blanks - Chapter 7

Chapter 7 - Work, Energy and Power
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.