ISRO Scientist or Engineer Civil 2014 Question 52

Question 52

A benchmark has been established at the soffit of an ornamental arch at known elevation of 100.0 m above mean sea level. The back sight used to establish height of instrument is an inverted staff reading 2.105m. A forward sight-reading with normally held staff of 1.105m is taken on recently constructed plinth. The elevation of plinth is



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