Surveying
Benchmark is established by

spirit levelling
trigonometrical levelling
barometric levelling
hypsometry

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens

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Surveying
The prismatic compass and surveyor’s compass

both give WCB of a line
both give QB of a line and WCB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give QB of a line

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