Chapter 9 Simple Machine - Test 1

1. Machines cannot help in doing work.

1) False
2) True
2. Machines can change the direction of force

1) True
2) False
3. Force can transfer from one place to another without use of machines

1) False
2) True
4. The weight lifted by a machine is called load

1) True
2) False
5. M.A. = Effort/Load

1) False
2) True
6. Work done on the machine is called in put.

1) False
2) True
7. Efficiency = work done on the machine .
Work done by the machine
1) True
2) False
8. The product of lead and Effort arm is called moment of load.

1) True
2) False
9. A bar, which can move around any point, is called a lever.

1) False
2) True
10. Mechanical Advantage of pulley is 4.

1) False
2) True
11. Lever system is used in crane for lifting heavy loads

1) False
2) True
12. Heavy stones shifted with the help of pulley for the construction of Egyptian Pyramids

1) True
2) False
13. Inclined plane is used for shift the patients on stretcher to the upper storey.

1) True
2) False
14. The point around which lever is rotated is called fulcrum

1) True
2) False
15. M.A. of Screw Jack = l/n

1) False
2) True
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