Physics
At hill stations, the boiling point of water will be

Equal to the melting point of ice
Less than that at sea level
Same as at sea level
More than that at sea level

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts works as good conductor
No radiation of heat takes place
Air layer between two shirts behaves like insulating media

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