Surveying
If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

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 outer spindle with a relative motion between the vernier and graduated scale of lower plate
on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate

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

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Surveying
Dumpy level is most suitable when

many readings are to be taken from a single setting of the instrument
All of these
fly levelling is being done over long distance
the instrument is to be shifted frequently

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