Surveying Online Test – Paper 3

1. If the image formed by the objective of the telescope is not in the plane of crosshairs, it is called

2. Natural error in leveling is caused due to

3. The projection of a line on a plane parallel to the meridian is known as

4. In trigonometrical leveling, the combined correction is given by (where m=coefficient of refraction)

5. A level tube is used to make the line of sight horizontal. It is filled with

6. A leveling station is a point where:

7. It is more difficult to obtain good results while measuring the horizontal distance by the stepping method

8. *The method of leveling used to carry out the reconnaissance of an area is

9. The maximum number of omitted measurements that can be calculated from latitudes and departures of a closed traverse is

10. The error eliminated by taking the mean of both face observations is

11. To orient a plane table without two inaccessible points, the method generally adopted is:

12. The number of horizontal cross wires in a stadia diaphragm is

13. In the scale of a map is 1:25000, what does it mean:

14. Contour lines

15. A chain 33 feet long and consisting of 16 links each 2(1/16) feet long is

16. The contour lines merge or cross one another on the map in the case of

17. The types of instrument generally used in the survey of gravity water supply system are:

18. The two-point problem and three-point problems are methods of:

19. *The radius of curvature of the arc of the bubble tube is generally kept

20. Working edge of alidade is called

21. If the included angle is greater than 180°, the deflection angle is

22. The boundary of water of a still lake is

23. *The line of collimation should be parallel to

24. The surface of zero elevation around the earth, which is slightly irregular and curved, is known as

25. The designation of scale recommended by IS: 1491-1959 is

26. *The instrument used to measure horizontal and vertical angle is

27. While measuring horizontal distance by stepping method we should follow

28. The three-point problem is concerned with:

29. The absence of spherical aberration in a telescope is known as

30. The location of the contour gradient for a highway is best set out from

31. The accuracy required in precise leveling is of the order of (Where K is the total distance of the level line in KM)

32. A 30 m long chain when tested should not show errors exceeding

33. In a double-line river, contours are

34. In a constant level tube, the size of the bubble remains constant because the upper wall of the tube has

35. Parallax may be eliminated by

36. The errors due to bad ranging are

37. The levelling head of a transit theodolite consists of

38. The maximum angular error in laying the direction is 3°; if this maximum displacement of the point on paper is the same for both sources of error, the accuracy in the offset measurement will be

39. The Philadelphia rod is a type of

40. The Bench Mark of a point is 400m. Backsight reading at the benchmark is 2.20, and the foresight reading of point A is 2.10. Find the RL of point A

41. Two contour lines, having the same elevation

42. The last reading of leveling is always at

43. The sensitivity of the bubble tube can be increased by

44. *Total station measures

45. The dip of the needle

46. For accurate work, in comparison to the chain, the steel band is used because it

47. For a line AB

48. In normal condition, the difference of fore and back bearing should be?

49. The process of turning the telescope about the horizontal axis in a vertical plane by a complete revolution is known as

50. In a traverse, the algebraic sum of the deflection angles, taking the right-hand deflection angles as positive and left-hand deflection as negative, should be equal to