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
Theodolite is an instrument used for

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

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

angular measurements are more accurate than linear measurements
linear and angular measurements of the traverse are of equal accuracy
All of these
linear measurements are more accurate than angular measurements

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

index error i.e. error due to imperfect adjustment of the vertical circle vernier
None of these
error due to horizontal axis not being perpendicular to the vertical axis
error due to non-parallelism of the axis of telescope level and line of collimation

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