A well stoppered thermos flask containing some ice cubes is an example of a/an:

closed system

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open system

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isolated system

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none of these

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Solution

The correct option is C isolated system
Since the thermos flask in well stoppered, it cannot exchange mass with the surrounding. Also, it cannot exchange heat (thermal energy) with the surrounding.
Hence, it is an isolated system.

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Similar questions

Assertion (A): A system is said to be closed if it can exchange energy but not matter.

Reason (R): Coffee in a stoppered thermos flask is an example of closed system.

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