Surveying
The angle between the observer's meridian and declination circle of a heavenly body, is known as

Right ascension
Declination
Hour angle
Azimuth

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Surveying
Systematic errors

Always follow some definite mathematical law
All listed here
Can be removed by applying corrections to the observed values
Are also known as cumulative errors

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

None of these
index error i.e. error due to imperfect adjustment of the vertical circle vernier
error due to non-parallelism of the axis of telescope level and line of collimation
error due to horizontal axis not being perpendicular to the vertical axis

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