Discussion :: UPSC Civil Service Exam Questions
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Which one of the following statements is correct ?
A.
The axis of plate level should be parallel to the vertical axis.
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B.
The axis of striding level must be parallel to the horizontal axis.
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C.
The axis of the altitude level must be perpendicular to the plate level axis.
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D.
The line of collimation must be perpendicular to the plate level axis.
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