Physics
The sparkling of a diamond is due to

Polarisation of light
Total internal reflection of light
Interference of light
Refraction of light

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Physics
RADAR is used for:

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

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Physics
The nature of fuse wire is

High resistance and high melting point.
Low resistance and low melting point.
Low resistance and high melting point.
High resistance and low melting point.

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