In differential levelling, the back sight (BS) reading on a benchmark of RL 500,text m is 2.685,text m and the fore sight (FS) reading on a new point is 1.345,text m . The RL of the new point is:

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Civil Engineering QUESTION #6568

Question 1

In differential levelling, the back sight (BS) reading on a benchmark of RL \(500\,\text{m}\) is \(2.685\,\text{m}\) and the fore sight (FS) reading on a new point is \(1.345\,\text{m}\). The RL of the new point is:

502.685 m
501.340 m✔️
501.345 m
504.030 m

Correct Answer Explanation

Height of Instrument \(= 500 + 2.685 = 502.685\,\text{m}\). RL of point \(= 502.685 - 1.345 = 501.340\,\text{m}\).

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