Surveying Set 2

to support the main part of the instrument ✘ to attach the theodolite to the tripod ✘ to provide a means for leveling the theodolite ✘ none of the above ✔

on its outer spindle with a relative motion between the vernier and graduated scale of lower plate ✘ on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate ✘ on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate ✘ on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate ✔

vertical circle is to its right and the bubble of the telescope is down ✘ vertical circle is to its right and the bubble of the telescope is up ✘ vertical circle is to its left and the bubble of the telescope is down ✘ vertical circle is to its left and the bubble of the telescope is up ✔

midway between eye piece and objec ✘ much closer to the eye-piece than to the objective lens ✘ much closer to the objective lens than to the eye piece ✘ anywhere between eye-piece and objective lens ✔

adjustment of plate levels ✘ adjustment of line of sight ✘ adjustment of horizontal axis ✘ adjustment of altitude bubble and vertical index frame ✔

leveling ✘ prolonging a straight line ✘ measurement of horizontal angles ✘ all of the above ✔

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

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

equal to true error ✘ half the true error ✘ two times the true error ✘ four times the true error ✔

error due to imperfect graduations ✘ error due to eccentricity of verniers ✘ error due to imperfect adjustment of plate levels ✘ error due to line of collimation not being perpendicular to horizontal axis ✔