AIIMS 2019 Physics Refrigerator Efficiency MCQ Question

The calculation of the refrigerator's efficiency (η) using the formula η = 1 - (T₂/T₁) demonstrates that the efficiency is indeed 0.0382 when substituting T₂ = 277 K (273 + 4) and T₁ = 288 K (273 + 15). This low efficiency indicates that refrigerators are not highly efficient devices, as they require significant energy input to transfer heat from a cooler to a warmer environment. Other options are not relevant as they do not provide any additional context or values related to the efficiency calculation. Understanding this concept is crucial for evaluating the performance of thermodynamic systems like refrigerators.