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ICSE Class 10 Physics 2017 Paper

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Question : 31 of 65
Marks: +1, -0
Efficiency of the pulley system.
Solution:  
Efficiency(η)=  M.A.    V.R.  ×100%\text{Efficiency}(\eta) = \frac{\;\text{M.A.}\;}{\;\text{V.R.}\;} \times 100\%
=3.54×100%=87.5%= \frac{3.5}{4} \times 100\% = 87.5\%
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