Which observation practice is most effective for reducing the effect of random errors in a measured angle?
Correct answer: D. Repeating the measurement and taking the mean
- A. Ignoring small differences between readings
- B. Applying the same fixed correction once
- C. Using a longer station name
- D. Repeating the measurement and taking the mean
Explanation
Random errors vary in magnitude and sign, so repeated independent observations can partly cancel when their mean is used. A fixed correction is suitable for a known systematic error, not for a random one.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Surveying
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.
Practise Surveying
77 free Surveying MCQs from Civil Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Civil Engineering questions like this
Civil Engineering is on 3 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Surveying questions
A vertical photograph is taken from a flying height H above the ground, and the camera focal length is f. For level terrain, the approximate photo scale is:
An electronic distance measurement instrument determines distance mainly by measuring the:
The horizontal distance between two successive contour lines is called the:
In the coordinate method for computing the area of a polygon, the algebraic sum of the coordinate products is commonly evaluated by the:
In chain surveying, a well-conditioned triangle should generally have no angle smaller than:
In compass surveying, a local attraction at one station is suspected when the fore bearing and back bearing of a line differ by: