Q.

In a refrigerator what produces the cooling?

A. The ice which deposits on the freezer
B. The sudden expansion of a compressed gas
C. The evaporation of a volatile liquid
D. None of these
Answer» D. None of these
Explanation: Basically, refrigeration system consists of devices that compress and expand refrigerant gas. When refrigerant gas is compressed it expels heat and when it is suddenly expanded, absorbs heat. A refrigerator (colloquially fridge) is a common household appliance that consists of a thermally insulated compartment and a heat pump (mechanical, electronic, or chemical) that transfers heat from the inside of the fridge to its external environment so that the inside of the fridge is cooled to a temperature below the ambient temperature of the room.
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