Surveying
In the double application of principle of reversion, the apparent error is

four times the true error
two times the true error
equal to true error
half the true error

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Surveying
Contour interval is

Larger if the time available is more
Directly proportional to the flatness of ground
Inversely proportional to the scale of the map
Larger for accurate works

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Surveying
The prismatic compass and surveyor’s compass

both give 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
both give QB of a line and WCB of a line

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