Physics
It is more difficult to walk on a sandy road than on a concrete road because

the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.
sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.

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Physics
In the process of magnetisation of a bar

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

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