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Q1: In levelling operation

A when the instrument is being shifted, the staff must not be moved

B when the staff is being carried forward, the instrument must remain stationary

C both (a) and (b)

D neither (a) nor (b).

ANS:C - both (a) and (b)

A) Before shifting of the instrument, we have the final reading on the staff as FS, then after changing the instrument, we must not move the staff, else the continuity may be missed, after changing the instrument point we need to take the BS reading on the unmoved staff.

B) When the staff is being carried forward, the instrument must remain stationary.



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