Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

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

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Surveying
Circumpolar stars

Are seldom seen near the pole star
Rotate round the North Pole
Rotate round the celestial pole
Remain always above the horizon

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