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Q: What are the main instruments in a SONAR, which are used to find the distance, direction and speed of an underwater body?
  • A. Amplifier and speaker
  • B. Speaker and microphone
  • C. Transmitter and detector
  • D. Amplifier and microphone
Correct Answer: Option C - The main instrument transmitter and detector present in a SONAR is used to detect the distance, direction, and speed of an underwater body.
C. The main instrument transmitter and detector present in a SONAR is used to detect the distance, direction, and speed of an underwater body.

Explanations:

The main instrument transmitter and detector present in a SONAR is used to detect the distance, direction, and speed of an underwater body.