Surveying
Which of the following is not the function of levelling head ?

None of these
to support the main part of the instrument
to provide a means for leveling the theodolite
to attach the theodolite to the tripod

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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 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

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