Which Instrument is Used to Measure Depth of Ocean (1) Galvanometer (2) Fluxmeter (3) Endoscope (4) Fathometer

Answer: The correct answer is (4) Fathometer.

Explanation

A Fathometer is a gadget that is often used for measuring the ocean and sea depth. It is sometimes called 312 Fathometer. It is generally attached beneath a ship or boat and produces echoes and sound waves into the water for measuring the ocean depth.