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

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

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Surveying
Spring tides are caused when

Solar tidal force and lunar tidal force both coincide
Sun and moon are in line with earth
Solar tidal force acts opposite to lunar tidal force
None of these

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

All of these
linear and angular measurements of the traverse are of equal accuracy
linear measurements are more accurate than angular measurements
angular measurements are more accurate than linear measurements

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