Physics
To measure the speed of an approaching car a police officer shines

Ultra high frequency waves on it
Light waves on it
Radio waves on it
Microwaves on it

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The sea is wider than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water

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Physics
In the process of magnetisation of a bar

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

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