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_________________?

A. altitude bubble on index frame if it is to be used as a level

B. altitude bubble on telescope if it is to be used as a level

C. altitude bubble on index frame

D. correct answer is?

E. altitude bubble on telescope

Be the first to comment if anything wrong with this mcq
Your comment successfully submitted!
It will automatically posted after review and approval by our staff member.