Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
Is the period of time taken by the earth in making a complete rotation with reference to stars
All listed here
Is slightly shorter than an ordinary solar day

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Surveying
Dumpy level is most suitable when

All of these
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

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