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

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

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Surveying
Spring tides are caused when

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

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Surveying
Circumpolar stars

Remain always above the horizon
Rotate round the North Pole
Are seldom seen near the pole star
Rotate round the celestial pole

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