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UPSC Civil Service Exam Questions

Q1:

In setting out a long straight line for the position of transmission towers, it is recommended that the forward point be set out with face-right and face-lett with reference to preceding point and the mean position taken. This field procedure eliminates instruments error where the

A trunnion axis is not perpendicular to vertical axis

B vertical axis is not perfectly vertical time of observation

C line of collimation is not perpendicular to the vertical axis

D line of collimation is not perpendicular to the horizontal axis

ANS:D - line of collimation is not perpendicular to the horizontal axis

Please explain the answer.



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