Which device needs an external energy input to operate, according to the second law?

  1. a cup of tea cooling
  2. a refrigerator
  3. a hot iron cooling
  4. an ice cube melting in a warm room
Answer

B) a refrigerator

Pumping heat uphill. SLO P-11-C-15 · Understanding

Physics MCQ · More Heat Engines, Second Law and Entropy MCQs · Practise