Surveying
The great circle along which the sun appears to trace on the celestial sphere with earth as centre during the year, is called

None of these
Ecliptic
Celestial equator
Equator

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Surveying
Theodolite is an instrument used for

measurement of vertical angles only
measurement of both horizontal and vertical angles
measurement of horizontal angles only
tightening the capstan-headed nuts of level tube

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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

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