Surveying
Sidereal day

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

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Surveying
For a line AB

none is correct
the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of AB differ by 180°

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Surveying
Accidental errors

All of these
Are generally small
Do not follow any definite mathematical law
Cannot be removed by applying corrections to the observed values

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