![A level instrument at a height of 1.320 m has been placed at a station having a Reduced Level (RL) of 112.565 m](https://www.gkseries.com/blog/wp-content/uploads/2023/09/A-level-instrument-at-a-height-of-1.320-m-has-been-placed-at-a-station-having-a-Reduced-Level-RL-of-112.565-m.jpg)
Q. A level instrument at a height of 1.320 m has been placed at a station having a Reduced Level (RL) of 112.565 m. The instrument reads -2.835 m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck is
(A) 116.720 (B) 116.080 (C) 114.080 (D) 111.050
Ans: 116.720
Sol:
The correct option is C 116.720
(Bottom of bridge deck staff reading is -ve indicates inverted staff.)
Height of instrument=112.565+1.320 =113.885m
RL of bottom of bridge=113.885+2.835 =116.720m