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The first sight in levelling operation is-
  • a)
    BS
  • b)
    FS
  • c)
    IS
  • d)
    All the above
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The first sight in levelling operation is-a)BSb)FSc)ISd)All the above...
The first sight taken on a levelling staff held at a point of known elevation. B.S. enables the surveyor to obtain HI +sight
Backsight (BS) – short for "backsight reading", the first staff reading taken by the surveyor after the levelling instrument is set up and levelled. B.S is generally taken on the point of known reduced level as on the benchmark or a change point.
Hence, the correct option is (A)
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The first sight in levelling operation is-a)BSb)FSc)ISd)All the aboveCorrect answer is option 'A'. Can you explain this answer?
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