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Q: Sonar is a device that uses ultrasonic waves to measure the distance, direction and speed of object_________.
  • A. On land
  • B. In air
  • C. In space
  • D. Underwater
Correct Answer: Option D - The device which uses ultrasonic waves to measure the distance, direction and speed of underwater objects is known as SONAR. SONAR stands for Sound Navigation and Ranging. It is helpful for exploring and mapping the ocean because sound waves travel faster in water than that in air.
D. The device which uses ultrasonic waves to measure the distance, direction and speed of underwater objects is known as SONAR. SONAR stands for Sound Navigation and Ranging. It is helpful for exploring and mapping the ocean because sound waves travel faster in water than that in air.

Explanations:

The device which uses ultrasonic waves to measure the distance, direction and speed of underwater objects is known as SONAR. SONAR stands for Sound Navigation and Ranging. It is helpful for exploring and mapping the ocean because sound waves travel faster in water than that in air.