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
y-parallax is not affected
All listed here
The scale of the model is altered

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Surveying
Contour interval is

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

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

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