Surveying
Spring tides are caused when

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

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect adjustment of plate levels
error due to eccentricity of verniers
error due to imperfect graduations

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Surveying
The meridian of a place is

A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
A semi-circle which passes through the place and is terminated at the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place

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