Surveying
Height of instrument method of levelling is

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

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Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
none is correct
both (A) and (B) are correct
the forebearing of AB and back bearing of AB differ by 180°

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