Physics
What is refractive index ?

It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
None of above

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Physics
What is the direction of torque?

Opposite to the direction of applied force
Same as the direction of applied force
Parallel to the radius
Perpendicular to the direction of applied force

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Physics
RADAR is used for:

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

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