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Question

Which part of a thermos flask prevents loss of heat?


A

Vacuum

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B

Cork stopper

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C

Double glass walls

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D

Shiny, silvery wall

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Solution

The correct option is D

Shiny, silvery wall


Though there is a vacuum in the thermos flask, radiation can take place as it does not require a medium. The shiny, silvery inner wall reflects the radiated heat and thus keeps the contents hot/cold.


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