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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, communicate with or detect objects on 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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