Surveying
In direct method of contouring, the process of locating or identifying points lying on a contour is called

ranging
horizontal control
vertical control
centring

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

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

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