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
Contour interval is

Larger if the time available is more
Inversely proportional to the scale of the map
Directly proportional to the flatness of ground
Larger for accurate works

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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down

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Surveying
Refraction correction

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

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