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

A. Second Permanent Station ‘Maitree’
B. First permanent station ‘Dakshin Gangotri’
C. SODAR (Sonic Detection And Ranging)
D. None of the above
✅ The correct answer is option C.
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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