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      Question

      The device used for locating submerged objects under sea

      is –
      A sonar Correct Answer Incorrect Answer
      B radar Correct Answer Incorrect Answer
      C laser Correct Answer Incorrect Answer
      D maser Correct Answer Incorrect Answer

      Solution

      Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate,communicatewithordetectobjectson or under the surface of the water, such as other vessels. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water.

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