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

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

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Surveying
Bowditch rule is applied to

an open traverse for graphical adjustment
a closed traverse for adjustment of closing error
determine the effect of local attraction
None of these

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Surveying
A ’level line’ is a

horizontal line
line parallel to the mean spheriodal surface of earth
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line passing through the center of cross hairs and the center of eye piece

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Surveying
The difference between a level line and a horizontal line is that

level line is a curved line while hori-zontal line is a straight line
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same

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