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

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Surveying
Theodolite is an instrument used for

measurement of both horizontal and vertical angles
measurement of vertical angles only
tightening the capstan-headed nuts of level tube
measurement of horizontal angles only

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Surveying
Pick up the correct statement for horizontal photographs.

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

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Surveying
Homologous points are

Plumb points of stereo pair of photographs
Opposite corners of a photograph
Corresponding points on the ground and photograph
Nodal points of the camera lens

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