Surveying
The line of collimation method of reduction of levels, does not provide a check on

Fore sights
Back sights
Intermediate sights
Reduced levels

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

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

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

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

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