Surveying
A star in northern sphere is said to transit

When it is in south
When its altitude is maximum
When its azimuth is 180°
All listed here

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Surveying
A ’level line’ is a

line passing through the center of cross hairs and the center of eye piece
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line parallel to the mean spheriodal surface of earth
horizontal line

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Surveying
Contour interval is

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

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