Surveying
There are two stations A and B. Which of the following statements is correct?

The fore bearing of AB is AB
All listed here
The fore and back bearings of AB differ by 180°
The back bearing of AB is BA

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Surveying
Systematic errors

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

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Surveying
If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate
on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle with a relative motion between the vernier and graduated scale of lower plate
on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate

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