In levelling, _______ is also called minus sight.

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  1. intermediate sight
  2. Inverted intermediate sight
  3. back sight
  4. fore sight

Answer (Detailed Solution Below)

Option 4 : fore sight
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Explanation:

Back Sight (or plus sight): 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.

Fore sight (or minus sight): The last staff reading taken before changing the instrument to the other position. It is the staff reading taken on point whose RL is to determined. This sight is considered as negative and deduced from Height of Instrument to determine RL of the point.

Intermediate sight: All readings taken between back sight and fore sight. These are the points whose RL is determined by the method already mentioned above in FS.
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