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Surveying - Engineering

Q1:

The 10 mm markings on a levelling staff placed at 20 m are separated by

A radian

B radian

C radian

D radian.

ANS:C - radian

10mm convert to meters 0.001.
20m.
So, 0.001/20 =1/2000. Angle = chord/radius.
So 10mm/20m.
= 10mm/20000mm.
= 1/2000 is answer. For 10 mm (i.e. 0.01 m) vertical, horizontal is 20 m.

Therefore slope = vertical/horizontal = 0.01/ 20 = 1/2000.