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Assertion (A): Pseudo-adiabatic ascent is isentropic.

Reason (R): Pseudo-adiabatic ascent removes the condensed water as precipitation.

Select the correct answer from the options below.

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

Answer: A

The reason is correct and it is exactly why the assertion fails: removing mass from the parcel makes the process irreversible, so it is adiabatic without being isentropic. The reversible process, which retains the condensed water, is isentropic. The distinction is small numerically but important conceptually, and this style of question tests precisely that.

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