Surveying
The equation which is obtained by multiplying each equation by the coefficient of its unknowns and by adding the equations thus formed, is known as

Conditional equation
Observation equation
None of these
Normal equation

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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 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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Surveying
Theodolite is an instrument used for

measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles
measurement of vertical angles only

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