Surveying
The principal line is the line joining the principal point and

Perspective centre
None of these
Nadir
Isocenter

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Surveying
Dumpy level is most suitable when

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

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Surveying
In the prismatic compass

the magnetic needle moves with the box
the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
the line of the sight does not move with the box
the magnetic needle and graduated circle do not move with the box

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