Surveying
During chaining along a straight line, the . leader of the party has 4 arrows in his hand while the follower has 6. Distance of the follower from the starting point is

120 m
4 chains
6 chains
180m

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Surveying
Refraction correction

has no effect on curvature correction
adds to the curvature correction
completely eliminates curvature correction
partially eliminates curvature correction

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Surveying
Contour interval is

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

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