Physics
A system exhibiting S.H.M. must possess

Elasticity, inertia and an external force
Elasticity as well as inertia
Elasticity only
Inertia only

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Physics
In the process of magnetisation of a bar

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

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

more surface area of the barrel is in contact with the road when it is pulled
the full weight of the barrel comes into play when it is pulled
the rolling friction is much less than the sliding friction
coal tar is a liquid and it flows in the barrel when it is rolled

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