MDCAT Physics MCQ #3425

Why can't a real heat engine achieve 100% efficiency?

MDCAT Physics MCQ #3425

  1. Question 1

    Q1. Why can't a real heat engine achieve 100% efficiency?

    • A) Due to friction
    • B) Due to heat loss
    • C) Because it violates the Second Law
    • D) Because it operates in a cycle

    Answer: Because it violates the Second Law

    Explanation: 100% efficiency violates the Second Law; friction and heat loss are practical limitations, not the fundamental reason.