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

contour interval
contour gradient
horizontal equivalent
contour line

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Surveying
Normal tension is that pull which

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

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Surveying
Refraction correction

has no effect on curvature correction
completely eliminates curvature correction
adds to the curvature correction
partially eliminates curvature correction

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