Surveying
If a tripod settles in the interval that elapses between taking a back sight reading and the following foresight reading, then the elevation of turning point will

not change
either ‘A’ or ‘B’
increase
decrease

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Surveying
Contour interval is

Larger if the time available is more
Larger for accurate works
Inversely proportional to the scale of the map
Directly proportional to the flatness of ground

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

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