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The efficiency of a machine is the ratio of useful output work to input work.

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Important Questions on Simple Machines

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Science>Physics>Simple Machines>Machines and Simple Machines
 Wheel is used with axle because :
 
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The force applied to move an object is called _____.
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The outer parts of machines are painted to protect them from _____.
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Which of the following is not a function of a machine?
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Which is not a simple machine?
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The _____ of a machine is the ratio of useful output work to input work.
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A force applied to a machine to do mechanical work is called _____.
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A machine having 100% efficiency is known as an_____machine. 
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_____ (Corkscrew/ Screw jack) is used to pull out a cork from a bottle of ketchup.
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A machine having 100 %  efficiency is known as _____ machine.
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The door knob of the house is an example of
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Choose the odd-one-out giving reason.

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A machine cannot be _____ per cent efficient.
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For an ideal machine, the efficiency is :
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The useful work done by an actual machine is always _____ than the work done on the machine. (less, more)
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A pair of tongs is an example of lever of _____ type.
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A simple machine changes the _____ of force to make work easier. (time/direction)
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(Crane / lifts) _____is used to lift heavy objects like cars.
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A _____ is used to lift and carry heavy objects like vehicles from the ground.
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Science>Physics>Simple Machines>Machines and Simple Machines
Spot the odd-one-out.