Civil Services TNPSC Group 1 (New Syllabus) Mock Test 2025 General Science Physics Measuring Instruments
The depth of a sea can be determined by using SONAR. Consider the following statements about it:
1. It uses ultrasonic waves for the measurement of the depth of a sea.
2. The speed of ultrasonic waves in seawater is the same as that of sound in air.
3. Time taken by ultrasonic waves reflected from the bottom of the sea to reach the detector is used to measure the depth.
Which of the above statement(s) is/are correct?
1
3 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3 only
5
Answer Not Known