Q : During eleventh Antarctic Expedition in Nov. 1991/March 1992 was installed.

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

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

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.