Question

Which of the following devices is used to measure the
direction and speed of underwater objects?
(A) Silicon Diode
(B) Hydrometer
(C) Speedometer (D) Sonar​

Answer 1

Answer:

D Sonar

Explanation:

It is the right answer

Answer 2

Sonar is used to measures the direction and speed of the underwater object.

Explanation:  

This is a technique used for sound propagation navigation system, to check the navigation system. They communicate with object under the water surface. By using this technique they have found many mysteries related to flight crash. They are also used to solve the mysteries related to certain historical monument found in underwater or deep water.