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Question

During levelling work along a falling gradient, the following data was obtained: The staff readings are 1.820 m, 2.810 m, 0.420 m, 1.460 m. The correct order of booking these four readings in a level book are

A
BS, IS, IS, FS
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B
BS, IS, BS, FS
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C
BS, FS, BS, FS
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D
BS, IS, FS, FS
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Solution

The correct option is C BS, FS, BS, FS
First reading is always back sight (BS). Leveling has been done along the falling gradient, so staff reading will always increase until instrument is not shifted. Third reading is less than second reading, this confirms shifting of instrument after second reading. So, second reading is foresight and third reading is backsight. Fourth reading is last reading, hence foresight.

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