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JEE PHYSICS MCQ: THERMODYNAMICS
1
Medium
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Understanding
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(A): During a free expansion of an ideal gas work done is zero.
(R): Work done against vacuum is zero.
(R): Work done against vacuum is zero.
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Correct option: B
Both (A) and (R) are true and (R) is not the correct explanation of (A)
Option B is correct because both the assertion and the reason are true, but the reason is not the correct explanation of the assertion. Free expansion occurs against zero external pressure, and work done against a vacuum is indeed zero, but the reason for zero work in free expansion is not *only* because it's a vacuum.
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