Physics
RADAR is used for:

detecting and locating the position of objects such as Aeroplanes.
receiving a signals in a radio receiver.
locating geostationary satellites.
locating submerged submarines.

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Physics
Scalar Quantities are

Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and direction

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Physics
Hydro-electric power is a:

A mixture of renewable and non-renewable natural resource
non-renewable natural resource
Neither renewable nor non renewable resource
Renewable natural resource

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