Q.

'SONAR' is mostly used by -

A. Doctors
B. Engineers
C. Astronauts
D. Navigators
Answer» D. Navigators
Explanation: a method or device for detecting and locating objects especially underwater by means of sound waves sent out to be reflected by the objects also : a device for detecting the presence of a vessel (such as a submarine) by the sound it emits in water.
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