Surveying
The stereo plotting instruments are generally manufactured on the principle of

Optical projection
All of these
Mechanical projection
Optical mechanism projection

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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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Surveying
Pick up the correct statement for horizontal photographs.

The two sides of a road meet at the vanishing point
All listed here
The lines parallel to the negative plane are projected as parallel lines
Parallel lines do not appear parallel in central projection

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