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A levelling staff is used to establish:

(a) Horizontal line of sight

(b) Vertical line of sight

(c) Location of points

(d) Distance of points

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Right option is (a) Horizontal line of sight

Best explanation: A levelling staff is a straight rectangular rod, with graduations, zero starting from foot of staff. It is placed at the required point and horizontal line of sight from a level is made.

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