Surveying
After fixing the plane table to the tripod, the main operations which are needed at each plane table station are
(i) Levelling
(ii) Orientation(
iii) Centering
The correct sequence of these operations is

(ii), (iii), (i)
(i), (ii), (iii)
(i), (iii), (ii)
(iii), (i), (ii)

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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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