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

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Surveying
Sidereal day

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

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