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

ANSWER DOWNLOAD EXAMIANS APP

Surveying
The prismatic compass and surveyor’s compass

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

ANSWER DOWNLOAD EXAMIANS APP