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

horizontal equivalent
contour gradient
contour interval
contour line

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to line of collimation not being perpendicular to horizontal axis
error due to eccentricity of verniers
error due to imperfect adjustment of plate levels
error due to imperfect graduations

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