Physics
In the process of magnetisation of a bar

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

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals
metals are good conductor of heat
metals have higher thermal capacity than plastics
plastics have a lower density than metals

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