Question

Submarine uses ............................ for navigation which works on principle of ..........................

• A. Radar, Reflection of ultrasonic waves.
• B. Sonar, Reflection of ultrasonic waves.
  
• C. Radar, Detection of cosmic radio waves.
  
• D. Periscope, bending of light.
  

Answer 1

The correct option is B Sonar, Reflection of ultrasonic waves.

Answer is B

To locate a target, a submarine uses active and passive SONAR.

Sonar is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water by sending ultrasonic waves and receiving reflected ultrasonic waves and calculating time elapsed.