Surveying
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

true R.L.
less than true R.L.
more than true R.L.
None of these

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Surveying
The rise and fall method

is less accurate than height of instrument 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

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