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In levelling, the combined correction for earth curvature and atmospheric refraction for a distance D (in km) is given by:

A- 0.0785 D^2 meters
B+ 0.0112 D^2 meters
C- 0.0673 D^2 meters
D- 0.1352 D^2 meters

Explanation

Curvature correction Cc = -0.0785 D^2 (downward/subtractive). Refraction correction Cr = +0.0112 D^2 (upward/additive). Combined correction C = Cc + Cr = -0.0673 D^2 meters.

Submitted by: mcqstutor Team More Civil Engineering MCQs →

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