Surveying
Spring tides are caused when

Sun and moon are in line with earth
None of these
Solar tidal force and lunar tidal force both coincide
Solar tidal force acts opposite to lunar tidal force

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Surveying
Theodolite is an instrument used for

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

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

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

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