Surveying
Dumpy level is most suitable when

the instrument is to be shifted frequently
many readings are to be taken from a single setting of the instrument
All of these
fly levelling is being done over long distance

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

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

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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
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
level line is a curved line while hori-zontal line is a straight line

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