Physics
The safest hammers are those with heads that are

Alloy and drop-forged steel
Chiseled and drop forged
Cast steel and chiseled
Welded and alloyed

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Physics
In the process of magnetisation of a bar

Only the surface 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
The entire bulk of the bar gets magnetised

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