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

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

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Physics
In the process of magnetisation of a bar

Only the ends of the bar get magnetised
Only some parts of the outer layers of the bar get magnetised
The entire bulk of the bar gets magnetised
Only the surface of the bar gets magnetised

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