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UPSC Civil Service Exam Questions - Engineering

Q1:

In a third order traverse, if the standard error of ± 3" is assigned to each of the four source of errors, namely :
(i) reading the vernie
(ii) non-adjustment of transit
(iii) sighting and
(iv) setting over the station, then the total standard error of the work would be

A ±3"

B ±6"

C ±6.92"

D ±12"

ANS:B - ±6"

Please explain the answer.