Surveying
Three point problem can be solved by

Lehman’s method
Tracing paper method
Tracing paper method
All of these

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Surveying
Sidereal day

All listed here
Is slightly shorter than an ordinary solar day
Is divided into the conventional hours, minutes and seconds
Is the period of time taken by the earth in making a complete rotation with reference to stars

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Surveying
Contour interval is

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

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