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Civil Engineering MCQJE Level Civil Engineering

In the Height of Instrument (HI) method of levelling, the HI is calculated as:

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Choose the correct answer

A

HI = RL − BS

B

HI = RL of BM + Back Sight reading

C

HI = FS − BS

D

HI = average of all rod readings

Correct Answer

B. HI = RL of BM + Back Sight reading

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HI = RL of benchmark + BS (back sight reading). Then: RL of intermediate/fore sight = HI − IS or HI − FS. HI is convenient when many intermediate sights are taken from one instrument position. Rise and Fall method: Rise = previous reading − present reading if positive (used for arithmetic check).

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