Surveying
Which of the following errors can be neutralised by setting the level midway between the two stations ?

error due to curvature only
error due to refraction only
error due to both curvature and re-fraction
None of these

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Surveying
Accidental errors

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

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Surveying
The First Point of Aeries

All listed here
Is usually denoted by the Greek letter ?
Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda

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