Surveying
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

more than true R.L.
None of these
less than true R.L.
true R.L.

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Surveying
Circumpolar stars

Are seldom seen near the pole star
Rotate round the celestial pole
Remain always above the horizon
Rotate round the North Pole

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