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Working of a Thermos flask

................

Question

................... reflects all heat, .................... absorbs all heat.

A

White, black

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B

Black, white

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C

White, yellow

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D

None of above

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Solution

The correct option is C White, black
A black object absorbs all wavelengths of light and reflects none. Objects that are white, on the other hand, reflect all wavelengths of light and therefore absorb the least heat.

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Working of a Thermos flask

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