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Per NCERT §5.1.2, an ISOLATED system is exemplified by which container?
AA copper sealed vessel
BA thermos flask (no matter + no energy exchange)
CA cylinder with a piston
DAn open beaker
Answer & Solution
Correct answer: B. A thermos flask (no matter + no energy exchange)
Per NCERT §5.1.2(3), thermos flask is the textbook example of isolated system — no matter AND no energy crosses boundary.
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