Surveying
Circumpolar stars

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

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Surveying
Normal tension is that pull which

neutralizes the effect due to pull and sag
makes the correction due to pull equal to zero
makes the correction due to sag equal to zero
is used at the time of standardising the tape

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Surveying
Dumpy level is most suitable when

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

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