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

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

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to imperfect adjustment of plate levels
error due to imperfect graduations
error due to eccentricity of verniers
error due to line of collimation not being perpendicular to horizontal axis

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Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
neutralizes the effect due to pull and sag
makes the correction due to pull equal to zero
is used at the time of standardising the tape

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