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

reading both verniers and taking the mean of the two
taking both face observations and taking the mean of the two
taking mean of several readings distributed over different portions of the graduated circle
double sighting

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Surveying
The prismatic compass and surveyor’s compass

both give WCB of a line
both give QB of a line
both give QB of a line and WCB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively

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Surveying
Spring tides are caused when

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

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