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) CenteringThe correct sequence of these operations is

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

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

taking both face observations and taking the mean of the two
double sighting
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
Sidereal day

Is slightly shorter than an ordinary solar day
Is the period of time taken by the earth in making a complete rotation with reference to stars
All listed here
Is divided into the conventional hours, minutes and seconds

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the eight angles of a braced quadrilateral should be 360°
All listed here
The sum of the angles around a station should be 360°
The sum of the three angles of a plane triangle should be 180°

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