Surveying
The instrument used for accurate centering in plane table survey is

alidade
plumbing fork
trough compass
spirit level

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Surveying
If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate
on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle with a relative motion between the vernier and graduated scale of lower plate

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of any two sides is greater than the third
Every angle is less than two right angles
Sum of the three angles is equal to two right angles
Sum of the three angles less than six right angles and greater than two right angles

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

level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
level line is a curved line while hori-zontal line is a straight 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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