Question

samudr ki gahrai kis se pta krte h
(a) radioactive
(b) sonar
(c) uv ray
(d) sismograph

Answer 1

With help of sonar u can find depth of sea

@skb

Answer 2

Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses soundpropagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes