Surveying
There are two stations A and B. Which of the following statements is correct?

The fore bearing of AB is AB
The back bearing of AB is BA
The fore and back bearings of AB differ by 180°
All listed here

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Surveying
Dumpy level is most suitable when

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

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