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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Surveying
For a line AB

the forebearing of AB and back bearing of AB differ by 180°
none is correct
both (A) and (B) are correct
the forebearing of AB and back bearing of BA differ by 180°

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