When we say energy is 'used up', we really mean it is:

  1. converted into less useful forms (degraded)
  2. destroyed
  3. stored forever
  4. turned into mass
Answer

A) converted into less useful forms (degraded)

Energy is conserved. SLO P-11-C-19 · Understanding

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