Surveying
For plane ground the scale of a vertical photograph will be same as that of a tiled photograph along the photo parallel through

Isocenter
Principal point
Plumb point
None of these

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the angles around a station should be 360°
The sum of the eight angles of a braced quadrilateral should be 360°
All listed here
The sum of the three angles of a plane triangle should be 180°

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

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

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