Question

RADAR is used for

• A. Receiving a signal in a radio receiver
• B. Locating submerged submarines
• C. Locating geostationary satellites
• D. Detecting and locating the position of objects such as aeroplanes

Hint:

Think about what RADAR echoes off objects to find their distance and direction.

Answer 1

The Correct Option is D

RADAR stands for Radio Detection And Ranging. It is a system that sends out radio waves and picks up the waves that bounce back after hitting an object.

By measuring the time taken for the radio wave to return and the direction from which it returns, RADAR can find both the distance and the position of objects such as aeroplanes, ships, and storm clouds. This is exactly why it is used to detect and locate objects like aeroplanes.

Option A is wrong because receiving a signal in a radio receiver is a simple communication task, not the detection of an object using reflected waves.

Option B is wrong because submerged submarines are located using sound waves through a system called SONAR, not radio waves, since radio waves do not travel well underwater.

Option C is wrong because RADAR is mainly built for detecting and tracking moving objects in the air near Earth, not for locating fixed geostationary satellites, which are tracked using other radio and optical methods.

The correct answer is detecting and locating the position of objects such as aeroplanes.