Physics
RADAR is used for:

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

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Physics
Plants are dried up in winter due to frost because

Evaporation does not take place
Respiration does not take place at low temperature
There is mechanical loss of tissues and drought condition prevails
Photosynthesis does not take place at such low temperature

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