Surveying
The distance between the projection centre and the photograph, is called

Isocentric distance
Principal distance
Principal line
Focal length

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Surveying
In the prismatic compass

the magnetic needle moves with the box
the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
the line of the sight does not move with the box
the magnetic needle and graduated circle do not move with the box

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Surveying
Which of the following methods of theodolite traversing is suitable for locating the details which are far away from transit stations?

Measuring angle and distance from one transit station
Measuring angles to the point from at least two stations
Measuring angle at one station and distance from other
Measuring distance from two points on traverse line

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Surveying
Pick up the correct statement for horizontal photographs.

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

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