Surveying
Which of the following errors can be neutralised by setting the level midway between the two stations ?

error due to both curvature and re-fraction
error due to refraction only
error due to curvature only
None of these

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

horizontal line is normal to plumb line while level line may not be normal to the plumb line
both are same
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

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