Surveying
Contour interval is

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

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Surveying
The rise and fall method

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

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to wrong adjustment of line of collimation and trunnion axis
error due to eccentricity of verniers
error due to inaccurate graduation
error due to displacement of station signals

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