Question

# The efficiency of a machine is 90%. If 100 J of work is done by the effort, how much work is obtained at the load of the machine?

A
50 J
B
60 J
C
90 J
D
100 J

Solution

## The correct option is C 90 JGiven,  Efficiency η=90100=0.9 Work done by effort or WInput=100 J Work done by load (WOutput)=? We know that, η=WOutputWInput ⇒WOutput=η×WInput                    =0.9×100                    =90 JPhysics

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