Surveying
Which of the following errors can be neutralised by setting the level midway between the two stations ?

error due to curvature only
error due to both curvature and re-fraction
error due to refraction only
None of these

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Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
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

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

All of these
angular measurements are more accurate than linear measurements
linear and angular measurements of the traverse are of equal accuracy
linear measurements are more accurate than angular measurements

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