The SONAR technique is used to determine the:

Correct option is B

The correct answer is (B) depth of the sea.

Explanation:

• SONAR (Sound Navigation and Ranging) is used to measure the depth of the sea by emitting sound waves and measuring their return time after hitting the ocean floor.

Information Booster:

• Invented by: Paul Langevin in 1915 for submarine detection.
• Full Form: SONAR stands for Sound Navigation and Ranging.
• Working Principle: Uses sound waves to detect objects underwater.
• Applications: Used in submarines, fishing, underwater mapping, and oceanography.