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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 ability to retain the original form is called ……… .
26. The ratio of the stress to the strain is ……… .
27. A spring obeys ……… law.
28. Within elastic limit ….. is directly proportional to the strain.
29. The strain produced is proportional to the ………. .
30. The force applied to an elastic body is called ………. .
31. The ratio of the load to ……. is defined as mechanical advantage.
32. The ……… of a machine is always less than 100%.
33. One ……… is equal to a rate of energy transfer of 1 joule per second.
    35.The SI unit of power is ……… .
34. The SI unit of the mechanical power is ……. .
35. If the work work is defined as ………. .
    Key
36. newton(N) 2. newton(N) 3. joule(J) 4. foot-pound(ft-lb) 5. potential 6. joule(J)
37. power 8. velocity 9. power 10. power 11. power 12. power 13. power
38. horse power(hp) 15. 7.46 x 109 16. 106 17. 7 W 18. 746 19. greater
39. joule per second(J s-1) 21. one watt 22.friction 23. load 24. one 25. perfect