Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of the three angles less than six right angles and greater than two right angles
Every angle is less than two right angles
Sum of the three angles is equal to two right angles
Sum of any two sides is greater than the third

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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
quicker and less tedious for large number of intermediate sights
is not suitable for levelling with tilting levels

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
line passing through the center of cross hairs and the center of eye piece
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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