Surveying
Spring tides are caused when

None of these
Solar tidal force and lunar tidal force both coincide
Solar tidal force acts opposite to lunar tidal force
Sun and moon are in line with earth

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to wrong adjustment of line of collimation and trunnion axis
error due to eccentricity of verniers
error due to inaccurate graduation
error due to displacement of station signals

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Surveying
Refraction correction

adds to the curvature correction
has no effect on curvature correction
completely eliminates curvature correction
partially eliminates curvature correction

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