# Civil Engineering - Surveying

Exercise : Surveying - Section 3
16.
In case of reduction of levels by the height of instrument method,
∑ B.S. - ∑ F.S. = difference in R.L.S of the first station and last station
∑ (R.L. + I + F.S.) - first R.L = ∑ (H.I. + No. of R.L.s.)
both (a) and (b) above
neither (a) nor (b).
Explanation:
No answer description is available. Let's discuss.

17.
A theodolite is said to be in perfect adjustment if
rotation axis is vertical to the transit axis
transit axis is perpendicular to line of collimation
line of collimation sweeps out a vertical plane while the telescope is elevated or depressed
all the above.
Explanation:
No answer description is available. Let's discuss.

18.
While rotating the theodolite in the horizontal plane, the bubble of the bubble tube takes up the same position in its tube, it indicates
the rotation axis is vertical
the trummion axis is horizontal
the line of collimation is perpendicular to vertical axis
none of the above
Explanation:
No answer description is available. Let's discuss.

19.
The main plate of a transit is divided into 1080 equal divisions. 60 divisions of the vernier coincide exactly with 59 divisions of the main plate. The transit can read angles accurate upto
5"
10"
15"
20"
30"