Multiple choice

_______is an instrument used to measure the depth of the sea?

  1. Gyroscope

  2. Hydrometer

  3. Fathometer

  4. Hydrophone

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A fathometer is an echo-sounding instrument used to measure water depth in oceans and lakes. It works by sending sound waves down and measuring the time for the echo to return from the seabed. Hydrometer measures liquid density, gyroscope measures orientation, and hydrophone detects underwater sounds.

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