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

contour gradient
contour interval
horizontal equivalent
contour line

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

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

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