Surveying
Dumpy level is most suitable when

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

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

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