prismatic compass compass traversing bearings local attraction plane table surveying - One Line Questions

1. What is the theoretical difference between the forward and backward bearing of a line if there is no local attraction? — 180°
2. In compass traversing, if the sum of interior angles of a closed traverse is calculated to be 350°, what is the error in the angles? — 10°
3. If the forward bearing of line AB is 120°, what is its backward bearing? — 240°
4. In Reduced Bearing (RB) system, if a line has a bearing of N 45° E, what is its Whole Circle Bearing (WCB)? — 45°
5. What is the resultant bearing of a line whose Reduced Bearing is S 60° W? — 240°
6. In Whole Circle Bearing (WCB), what is the bearing of a line pointing directly West? — 270°
7. In plane table traversing, what is the primary requirement for orienting the table? — A known direction (e.g., magnetic north or a previous line)
8. Which of the following is a common source of local attraction? — A steel bridge or iron ore deposit
9. How can the effect of local attraction be detected during compass traversing? — By comparing the forward and backward bearings of a line
10. In the 'Radiation' method of plane table surveying, how are points plotted? — By drawing lines of sight from a single station to the object
11. What does 'orientation' of the plane table mean? — Setting up the plane table so that the map is in the same relative position as the ground
12. What is the primary limitation of plane table surveying in hilly or obstructed terrain? — Limited visibility between stations
13. What is the 'index error' in a prismatic compass? — Error due to the line of sight not being parallel to the zero line of the graduation
14. What is a major advantage of plane table surveying? — Direct plotting of field data reduces errors
15. What is the primary advantage of using a plane table over a theodolite for certain surveys? — Direct plotting reduces cumulative errors
16. Which of the following can cause errors in plane table surveying? — All of the above
17. What is the primary advantage of using a prismatic compass over a surveyor's compass? — It allows for sighting and reading the bearing simultaneously
18. What is the difference between the true bearing and the magnetic bearing of a line called? — Magnetic declination
19. If the forward bearing of a line AB is N 50° E and the backward bearing of BA is S 50° W, what can be concluded? — No local attraction is present
20. What is the 'three-point problem' in plane table surveying? — Orienting the plane table at an unknown station using three known stations
21. In prismatic compass surveying, what does 'traversing' refer to? — Establishing a network of control points by measuring angles and distances
22. If the magnetic declination is 5° East, and the magnetic bearing of a line is N 40° E, what is its true bearing? — N 35° E
23. A line has a WCB of 315°. What is its Reduced Bearing (RB)? — N 45° W
24. If the forward bearing of a line AB is observed as N 30° E and the backward bearing of BA is observed as S 28° E, what is the likely presence of? — Local attraction at station B
25. The 'Intersection' method of plane table surveying is best suited for: — Areas with inaccessible stations
26. What is the main difference between a prismatic compass and a surveyor's compass regarding sighting? — Prismatic compass allows sighting and reading simultaneously, surveyor's compass requires separate sighting and reading
27. Which of the following is NOT a method of plane table surveying? — Progression
28. Which method of plane table surveying is used to establish a series of connected points forming a traverse? — Traversing
29. In plane table surveying, the 'two-point problem' is a specific case of: — Resection
30. Which method is used to orient the plane table when it is set up at an unknown station, but the directions of at least three known points are visible? — Resection
31. Which type of bearing is measured clockwise from the North direction? — Whole Circle Bearing (WCB)
32. If the magnetic declination is 10° West, and the magnetic bearing of a line is S 20° W, what is its true bearing? — S 30° W
33. Which of the following is a common type of alidade used in plane table surveying? — Both a and b
34. What is a 'bearing' in the context of a prismatic compass? —
35. What is the 'dip' of a magnetic needle? — The vertical angle the needle makes with the horizontal plane
36. The 'Resection' method in plane table surveying is used to determine: — The orientation of the plane table when the instrument is set up at an unknown station
37. What is 'local attraction' in prismatic compass surveying? — The deviation of the compass needle from the magnetic north due to nearby magnetic materials
38. Which instrument is typically used in conjunction with a prismatic compass for taking measurements in the field? — Chain or Tape
39. What is the 'object' of compass traversing? — To establish a framework of control points by measuring angles and distances
40. What is the main purpose of checking the 'fore and back bearings' of a line in compass traversing? — To detect and correct for local attraction
41. What is the purpose of 'checking the bearings' in compass traversing? — To detect and correct for local attraction
42. What is the 'Alidade' used for in plane table surveying? — To sight objects and draw lines of sight on the drawing
43. What is the 'Bevel Protractor' used for in conjunction with the Alidade? — To measure horizontal angles
44. What is the purpose of the 'spirit level' on a plane table? — To ensure the table is perfectly horizontal
45. What is the main purpose of 'plane table surveying'? — To plot the survey stations and traverse lines directly in the field
46. What is the primary function of a prismatic compass in surveying? — To measure horizontal angles and bearings
47. What is the 'Plumb Bob' used for in plane table surveying? — To center the plane table over a station
48. Which method of plane table surveying is used to plot details of an area from a single station? — Radiation
49. In prismatic compass surveying, what does the 'vernier' scale usually measure? — Horizontal angles or bearings
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