The purpose of using vacuum flask is to store

hot drinks.

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cold drinks.

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hot as well as cold drinks.

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None of these

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Solution

The correct option is C hot as well as cold drinks.
The purpose of using the vacuum flask is to store hot as well as cold drinks.
The basic concept behind using the vacuum flask is to keep the temperature of liquid constant which is being kept in the flask, no heat transfer would take place via conduction, convection or radiation.

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