Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 9 (Q.No. 48)
48.
Which one of the following statements is correct ?
The axis of plate level should be parallel to the vertical axis.
The axis of striding level must be parallel to the horizontal axis.
The axis of the altitude level must be perpendicular to the plate level axis.
The line of collimation must be perpendicular to the plate level axis.
Answer: Option
Explanation:
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