Q1. Radar is used for
(a) Detecting objects by using light waves
(b) Reflecting sound waves to detect objects
(c) Determining the presence and location of objects with radio waves
(d) Tracking rain-bearing clouds
(UPSC Prelims 1980)
Answer: (c) Determining the presence and location of objects with radio waves
Explanation: Radar uses radio waves to detect the distance, speed, and direction of objects, commonly used in aviation, weather forecasting, and defense.
