Surveying - Engineering

Q1:

Subtense tacheometry is generally preferred to if ground is

A flat

B undulating

C mountaineous

D deserts.

ANS:B - undulating

Tacheometric surveying is adopted in rough and difficult terrain where direct leveling & chains are either not possible or very difficult.

So, answer is undulating. Well, it should be water body as the staff is held in a horizontal plane since in water body no clear ground is available so we can put staff on the ground.