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

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

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Surveying
Dumpy level is most suitable when

fly levelling is being done over long distance
the instrument is to be shifted frequently
All of these
many readings are to be taken from a single setting of the instrument

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens
anywhere between eye-piece and objective lens
much closer to the eye-piece than to the objective lens

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