2701Civil EngineeringMedium
If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to________?
Aboth (1) and (4)
Bonly (1)
Cboth (2) and (3)
Donly (3)
Correct answer
A. both (1) and (4)
Explanation
The correct answer is both (1) and (4).