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Which one of the following is the CORRECT statement for a station that is affected by local attraction?
- a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.
- b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.
- c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.
- d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.
Correct answer is option 'C'. Can you explain this answer?
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Which one of the following is the CORRECT statement for a station that...
- Whenever there is any station affected by local attraction, then the difference between the fore bearing and back bearing is not equal to 180°.
- A freely suspended and properly balanced magnetic needle is expected to show magnetic meridian. However, local objects like electric wires and objects of steel attract magnetic needle towards themselves.
- Thus, needle is forced to show slightly different direction. This disturbance is called local attraction.
- For detecting local attraction it is necessary to take both fore bearing and back bearing for each line. If the difference is exactly 180°, the two stations may be considered as not affected by local attraction.
- If difference is not 180°, better to go back to the previous station and check the fore bearing. If that reading is same as earlier, it may be concluded that there is local attraction at one or both stations.
Most Upvoted Answer
Which one of the following is the CORRECT statement for a station that...
Local Attraction in Surveying
Local attraction is the phenomenon in surveying where the magnetic compass needle is deflected from its true north position due to the presence of magnetic substances in the vicinity of the survey station. This results in errors in the measurement of angles and bearings, which can affect the accuracy of the survey.
Effect on Fore Bearing and Back Bearing
The fore bearing and back bearing are two types of bearings that are measured in surveying. The fore bearing is the bearing of the forward direction of a survey line, while the back bearing is the bearing of the reverse direction of the same line. In the absence of local attraction, the difference between the fore bearing and back bearing is always equal to 180 degrees.
However, when a survey station is affected by local attraction, the magnetic compass needle is deflected from its true north position. This results in errors in the measurement of the bearings, which can cause the difference between the fore bearing and back bearing to be different from 180 degrees. Hence, option C, "Difference between the fore bearing and back bearing is not equal to 180 Degrees," is the correct statement for a station that is affected by local attraction.
Conclusion
Local attraction is a common source of error in surveying, and it is important to identify and correct for it to ensure accurate measurements. By understanding the effect of local attraction on the fore bearing and back bearing, surveyors can take appropriate measures to minimize its impact on their surveys.
Local attraction is the phenomenon in surveying where the magnetic compass needle is deflected from its true north position due to the presence of magnetic substances in the vicinity of the survey station. This results in errors in the measurement of angles and bearings, which can affect the accuracy of the survey.
Effect on Fore Bearing and Back Bearing
The fore bearing and back bearing are two types of bearings that are measured in surveying. The fore bearing is the bearing of the forward direction of a survey line, while the back bearing is the bearing of the reverse direction of the same line. In the absence of local attraction, the difference between the fore bearing and back bearing is always equal to 180 degrees.
However, when a survey station is affected by local attraction, the magnetic compass needle is deflected from its true north position. This results in errors in the measurement of the bearings, which can cause the difference between the fore bearing and back bearing to be different from 180 degrees. Hence, option C, "Difference between the fore bearing and back bearing is not equal to 180 Degrees," is the correct statement for a station that is affected by local attraction.
Conclusion
Local attraction is a common source of error in surveying, and it is important to identify and correct for it to ensure accurate measurements. By understanding the effect of local attraction on the fore bearing and back bearing, surveyors can take appropriate measures to minimize its impact on their surveys.
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Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer?
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Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer?.
Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
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ample number of questions to practice Which one of the following is the CORRECT statement for a station that is affected by local attraction?a)Difference between the fore bearing and back bearing is always equal to 90 Degrees.b)Difference between the fore bearing and back bearing is always equal to 180 Degrees.c)Difference between the fore bearing and back bearing is not equal to 180 Degrees.d)Difference between the fore bearing and back bearing is always equal to 360 Degrees.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Civil Engineering (CE) tests.
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