Surveying
The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

equidistant from A and B
closer to the higher station
closer to the lower station
as far as possible from the line AB

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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
many readings are to be taken from a single setting of the instrument
All of these

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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is down

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