Multiple choice

When the door of refrigerator is closed, the cooling effect inside is due to the

  1. isothermal expansion

  2. adiabatic expansion

  3. adiabatic compression

  4. isothermal compression
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During adiabatic expansion, there is increase in volume without heat flow, in or out. Inside a refrigerator, due to the isolated system, the adiabatic expansion of refrigerator gases like freon takes place by using the heat from the gas itself. This causes lowering of temperature of the gas, i.e. cooling effect of the refrigerator.

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