Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

All of these
Rational horizon
True horizon
Celestial horizon

ANSWER DOWNLOAD EXAMIANS APP

Surveying
Circumpolar stars

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

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP