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Chapter 1
Work Done and Power
Section (A)
Question No.1 – Blank Type
Fill in the blanks.

1. The SI unit of force is ………. .
2. The unit of force in SI is ………. .
3. The unit ……… is the same as newton meter.
4. The unit of work done in British system is ………. .
5. A wound clock spring has the ………. energy.
6. The energy may be given in terms of ……. .[or the electron volt]
7. The unit kilowatt is the unit of ………. .
8. The product of the force applied and the ………. can be expressed as power.
9. The product of the force and the velocity is equal to ………. .
10. The product of the force and velocity is ……….. .
11. The …….. is the product of the force and velocity.
12. The rate of doing work is defined as ……. .
13. The rate of doing work is ………. .
14. In British engineering system, the power of motors and engines are also expresses in ….... .
15. 1 hp is equal to …..erg s-1.
16. One mega watt is equivalent to ……… watt.
17. If the work done in 9s is 63 J, the power is ……. .
18. There are …….. W in 1 hp.
19. 1 kW power is ……… than 1 hp.
20. The unit watt is the same as …… .
21. The unit one joule per second is equivalent to ……… .
22. The mechanical advantage of a machine depends on the ………. present.
23. Mechanical advantage is the ratio of the …… to the effort.
24. The velocity ratio is usually much greater than ………. .
25. If a machine is …….. the mechanical advantage will be equal to the velocity ratio.
    26.The abilc limit ….. is directly proportional to the strain.
26. The strain produced is proportional to the ………. .
27. The force applied to an elastic body is called ………. .
28. The ratio of the load to ……. is defined as mechanical advantage.
29. The ……… of a machine is always less than 100%.
30. One ……… is equal to a rate of energy transfer of 1 joule per second.
    35.The SI unit of power is ……… .
31. The SI unit of the mechanical power is ……. .
32. If the work done in 1 second is ……. the power is 1 watt.
33. The strain produced is proportional to the ……… .
34. The rate of doing work is defined as ………. .
    Key
35. newton(N) 2. newton(N) 3. joule(J) 4. foot-pound(ft-lb) 5. potential 6. joule(J)
36. power 8. velocity 9. power 10. power 11. power 12. power 13. power
37. horse power(hp) 15. 7.46 x 109 16. 106 17. 7 W 18. 746 19. greater
38. joule per second(J s-1) 21. one watt 22.friction 23. load 24. one 25. perfect