Physics
Burns caused by steam are much severe than those caused by boiling water because

Temperature of steam is higher
Steam pierces through the pores of body quickly
Steam is gas and engulfs the body quickly
Steam has latent heat

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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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