Chapter 9 Simple Machine - Test 2

1. M.A. of inclined plane = 2 x Pi x L/n

1) True
2) False
2. Human foot is an example of 2nd type of lever.

1) True
2) False
3. Draw water from deep well we use wheel and axle.

1) True
2) False
4. With the help of screw Jack heavy load is lifted easily.

1) False
2) True
5. If friction is neglected output of machine is not equal to input.

1) True
2) False
6. List all the following are desirable function of a simple machine: .

1) reduces the work that needs to be done
2) shortens the time for doing work
3) changes the direction of force for doing work
4) makes it easier to work
7. Select those which influence the mechanical advantage of an inclined plane.

1) slope of the plane
2) weight of the load
3) area of the surface in contact
4) friction
8. If the following belong to the same order of level.

1) a and c are correct
2) pair of forceps
3) pair of scissors
4) oar of boat
9. A screw jack always has an efficiency less than 100% which one is best

1) there is always frictional force between its parts.
2) a screw jack is not a totally efficient machine
3) a screw is really an inclined plane
4) no friction
10. The work done by the force applied on the machine is

1) effort
2) in put.
3) load
4) out put
11. The ratio of output to input of any machine is called

1) power
2) mechanical advantage
3) work
4) aefficiency
12. A bar , which can move around any point, is called

1) wheel
2) lever
3) inclined plane
4) Pulley
13. What is an effort

1) a weight lifted by a machine
2) the ratio of applied force to useful work
3) force applied by machine
4) force applied on machine for doing work
14. The mechanical advantage of an inclined plane depends upon. a. height of plane

1) Angle of inclined plane
2) height of plane
3) length of plane
4) effort
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