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  1. During eleventh Antarctic Expedition in Nov. 1991/March 1992 ____ was installed.

    2. A.
    SODAR (SOnic Detection And Ranging)
    B.
    Second Permanent Station 'Maitree'
    C.
    First permanent station 'Dakshin Gangotri'
    D.
    None of the above

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    Answer : Option A

    Explanation :

    SODAR (SOnic Detection And Ranging), also written as sodar, is a meteorological instrument also known as a wind profiler which measures the scattering of sound waves by atmospheric turbulence.

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