Physics
The sky appears blue because

All colours interfere to produce blue
In white light, the blue component dominates
It is actually blue
The atmosphere scatters blue colour more than the others

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Physics
In the process of magnetisation of a bar

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

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