The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called

Answer: Option A

The efficiency of a refrigerator or heat pump is given by a parameter called the coefficient of performance (C.O.P.).
The C.O.P. of a refrigerator is given by the following equation:
$$\begin{array}{rl}& \text{C}\text{.O}\text{.P}\text{.}=\frac{\text{Desired Output}}{\text{Required Input}}\\ & =\frac{\text{Cooling Effect}}{\text{Work Input}}\\ & =\frac{\text{QL}}{\text{W}}\end{array}$$