As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be________________?

Related Mcqs:

1. If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to_______________?

   A. d
   B. 1/d
   C. d2
   D. 1/d2

2. If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be_______________?

   A. true R.L
   B. more than true R.L
   C. less than true R.L
   D. none of the above

3. After fixing the plane table to the tripod, the main operations which are needed at each plane table station are ______________ ?

   1. levelling
   2. orientation
   3. centering
   The correct sequence of these operations is

   A. (1), (2),(3)
   B. (1), (3), (2)
   C. (3), (1), (2)
   D. (2), (3), (1)

4. If the reduced bearing of a line AB is N60°W and length is 100 m, then the latitude and departure respectively of the line AB will be________________?

   A. +50 m, +86.6 m
   B. +86.6 m, -50 m
   C. +50m, -86.6 m
   D. +70.7 m,-50 m

5. If the intercept on a vertical staff is ob-served as 0.75 m from a tacheometer, the horizontal distance between tacheometer and staff station is________________?

   A. 7.5 m
   B. 25 m
   C. 50
   D. 75 m

6. Refraction correction________________?

   A. completely eliminates curvature correction
   B. partially eliminates curvature correction
   C. adds to the curvature correction
   D. has no effect on curvature correction

7. The size of a plane table is________________?

   A. 750 mm x 900 mm
   B. 600 mm x 750 mm
   C. 450 mm x 600 mm
   D. 300 mm x 450 mm

8. The instrument used for accurate centering in plane table survey is________________?

   A. spirit level
   B. alidade
   C. plumbing fork
   D. trough compass

9. Which of the following methods of plane table surveying is used to locate the position of an inaccessible point ?

   A. radiation
   B. intersection
   C. traversing
   D. resection

10. The methods used for locating the plane table stations are_______________?

    1. radiation
    2. traversing
    3.intersection
    4. resection
    The correct answer is

    A. (1) and (2)
    B. (3) and (4)
    C. (2) and (4)
    D. (1) and (3)