When a chain survey line crosses an obstacle that prevents chaining but allows ranging on both sides, the distance is commonly obtained by:
Correct answer: B. Measuring a suitable auxiliary line around the obstacle
- A. Using reciprocal ranging only
- B. Measuring a suitable auxiliary line around the obstacle
- C. Taking a magnetic bearing of the obstacle
- D. Replacing the chain with a levelling staff
Explanation
An auxiliary line can be measured around the obstacle, with offsets or constructed triangles used to determine the required distance. Reciprocal ranging helps locate a straight line but does not by itself measure the obstructed distance.
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 mistake caused by recording a staff reading as 1.86 m instead of 1.68 m is classified as which type of error?
Using Simpson's one third rule, what area is obtained from five equally spaced offsets of 2 m, 4 m, 6 m, 5 m and 3 m at 10 m intervals?
In levelling, the difference between the first and last reduced levels in a run should equal which quantity?
A map has a representative fraction of 1:50,000. A distance of 2 cm on the map represents what ground distance?
In aerial photogrammetry, stereoscopic overlap between photographs is primarily required to:
In levelling, a change point is selected primarily to: