Question

The height of the instrument is equal to:

• A. back sight + fore sight
• B. RL of benchmark + fore sight
• C. RL of benchmark + intermediate sight
• D. RL of benchmark + back sight

Hint:

HI = RL (BM) + Back Sight — a base rule in leveling!

Answer 1

The Correct Option is D

The Height of Instrument (HI) is calculated as: \[ \text{HI} = \text{RL of benchmark} + \text{Back Sight} \] This is used to determine the RLs of other points using the HI method.