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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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