Surveying
Height of instrument method of levelling is

more accurate than rise and fall method
less accurate than rise and fall method
None of these
quicker and less tedious for large number of intermediate sights

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Surveying
Systematic errors

Are also known as cumulative errors
All listed here
Always follow some definite mathematical law
Can be removed by applying corrections to the observed values

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

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

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