Surveying
Height of instrument method of levelling is

more accurate than rise and fall method
less accurate than rise and fall method
None of these
quicker and less tedious for large number of intermediate sights

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

double sighting
taking both face observations and taking the mean of the two
reading both verniers and taking the mean of the two
taking mean of several readings distributed over different portions of the graduated circle

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Surveying
The meridian of a place is

A great circle passing through the place and the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
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

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