Surveying
The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called

Celestial horizon
True horizon
Sensible horizon
Visible horizon

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

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

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

All of these
By subtracting their longitudes if places are in the same hemisphere
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By adding their longitudes if places are in the different hemispheres

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to displacement of station signals
error due to inaccurate graduation
error due to eccentricity of verniers
error due to wrong adjustment of line of collimation and trunnion axis

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Surveying
The length of a chain is measured from

outside of one handle to outside of other handle
centre of one handle to centre of other handle
inside of one handle to inside of other handle
outside of one handle to inside of other handle

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