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Assertion (A): Carnot efficiency depends only on the two reservoir temperatures.
Reason (R): Every reversible engine operating between the same two reservoirs must have the same efficiency.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the argument: if two reversible engines differed, coupling them would move heat from cold to hot with no work input, which the second law forbids. Working fluid and machine design therefore drop out entirely.

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