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

180m
120 m
4 chains
6 chains

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Surveying
Accidental errors

All of these
Are generally small
Cannot be removed by applying corrections to the observed values
Do not follow any definite mathematical law

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