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During a levelling work along a falling gradient using a Dumpy level and a Staff of 3m length, following successive readings were taken: 1.785, 2.935, 0.360, 1.320. What will be the correct order of booking these four readings in a level book? (BS : Back Sight IS : Intermediate Sight, FS : Fore Sight)
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- BS, FS, BS, FS
- BS, IS, FS, FS
- BS, IS, IS, FS
- BS, IS, BS, FS
- BS, FS, BS, FS
Correct Option: A
For first reading it is BS and then FS. Sudden change in value represent shifting of instrument. Therefore again first reading BS and then FS.
