Surveying
An imaginary line lying throughout the surface of ground and preserving a constant inclination to the horizontal is known as

contour interval
horizontal equivalent
contour gradient
contour line

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

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