UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

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If the line of sight between two stations A and B, on sea, and 80 km apart, makes tangent at point A, then the minimum elevation of the signal required at B (considering the coefficient of refraction "m" = 0.08 and the mean radius of earth as 6400 km) will be

42 m

210 m

420 m

840 m

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