A) Studying the sunspots
B) Receiving signals in a radio receiver
C) Detecting and fixing the position of objects, eg. Aeroplanes
D) Studying the movement of planets
Correct Answer: C
Solution :[c] Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar transmits radio waves or microwaves that reflect from any object in their path. A receive radar, which is typically the same system as the transmit radar, receives and processes these reflected waves to determine properties of the object(s).
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