In compass surveying, a local attraction at one station is suspected when the fore bearing and back bearing of a line differ by:
Correct answer: C. More or less than 180 degrees
- A. Exactly 90 degrees
- B. Exactly 180 degrees
- C. More or less than 180 degrees
- D. More or less than 360 degrees
Explanation
In the absence of local attraction, fore and back bearings differ by 180 degrees. A different difference indicates that magnetic disturbance may affect one or both station readings.
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Surveying covers measurement of distances, angles and elevations, traversing, levelling, contouring, plane table work, theodolites, total stations and basic photogrammetry. It includes error adjustment, coordinate calculations, area and volume determination, and the distinction between accuracy and precision, as well as between temporary and permanent adjustments.
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