Which one of these things can a thermal insulator can not do?

Keep cold things cold

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Make hot things cold

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Keep warm things warm

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None of these

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Solution

The correct option is B
Make hot things cold

Since thermal insulator cannot transfer heat, hence whatever is kept inside the thermal insulator its temperature does not change as there is no heat transfer.

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True or false?

(a) Glass is a bad conductor of heat.

(b) In a thermos flask, hot things remain hot and cold things become warm.

(d) During radiation the particles of the medium vibrate.

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