Physics
In a optical fibre cable, the signal is propagated along the

Cladding
Surface and cladding
Inner Core
Both core and cladding

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Physics
RADAR is used for:

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

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Physics
The blue colour of sky is due to

Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere
Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight

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