A well stoppered thermoflask contains some ice cubes. This is an example of a/an:

Closed system

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Open system

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Isolated system

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Non-thermodynamic system

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Solution

The correct option is C Isolated system
In an isolated system, neither the exchange of matter nor the exchange of energy is possible with the surrounding. Thermoflask will not allow the exchange of matter and energy with the surrounding. Hence, it is an example of an isolated system.

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