Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
makes the correction due to pull equal to zero
is used at the time of standardising the tape
neutralizes the effect due to pull and sag

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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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