Physics
The recoiling of gun is an example of which of the following?

Law of Conservation of Energy
Law of Conservation of Angular Momentum
Law of Conservation of Linear Momentum
Conversion of Kinetic Energy to Potential Energy

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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
Mirage is due to:

Depletion of ozone layer in the atmosphere
Unequal heating of different parts of the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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