Civil Engineering - UPSC Civil Service Exam Questions - Discussion

34. 

The two-peg test in the adjustment of a dumpy level employs the principle that

[A]. equal lengths at back sight and fore sight do not affect the difference in level.
[B]. reciprocal levelling eliminates errors of non-parallel instrument and collimation axes.
[C]. two readings from the same station will minimize errors in bubble tube axis.
[D]. correction is made for verticle axis at one peg and for horizontal axis at the other peg.

Answer: Option A

Explanation:

No answer description available for this question.

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