56.
If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to

58.
Normal tension is that pull which

59.
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

60.
For accurate work, the steel band should always be used in preference to chain because the steel band

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