Surveying
If the distance between the projectors is altered by a movement along X-axis of one projector,

The length of the air base is increased
The scale of the model is altered
y-parallax is not affected
All listed here

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Surveying
Contour interval is

Inversely proportional to the scale of the map
Directly proportional to the flatness of ground
Larger if the time available is more
Larger for accurate works

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to non-parallelism of the axis of telescope level and line of collimation
None of these
error due to horizontal axis not being perpendicular to the vertical axis
index error i.e. error due to imperfect adjustment of the vertical circle vernier

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