Surveying
Contour interval is

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

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Surveying
The meridian of a place is

A great circle passing through the place and the poles
A semi-circle which passes through the place and is terminated at the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
An arc of the great circle which passes through the place and is perpendicular to the equator

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Surveying
The rise and fall method

is not suitable for levelling with tilting levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
provides a check on the reduction of intermediate point levels

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