Surveying
With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be

7 h 30 m
7 h 00 m
8 h 00 m
9 h 00 m

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Surveying
A ’level line’ is a

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

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