Question

If the efficiency of a machine is $10\%$ and the work done on a machine is $2000J$, then what is the work done by the machine?

• A. $800J$
• B. $1100J$
• C. $200J$
• D. $1500J$

Answer 1

The correct option is C

$200J$

Given:
Input work done = $2000J$

Efficiency, $n=10\%=0.10$

$n=\frac{Outputwork}{Inputwork}$

$\Rightarrow Outputwork=n\times Inputwork$
$=0.10\times 2000J=200J$
$\therefore$ Work done by the machine is $200J$.