Which of the following angles can be set out with the help of French cross staff?

Related Mcqs:

1. 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

2. Cross staff is an instrument used for________________?

   A. measuring approximate horizontal angles
   B. setting out right angles
   C. measuring bearings of the lines
   D. none of the above

3. In the cross-section method of indirect contouring, the spacing of cross-sections depends upon_____________?

   1. contour interval
   2. scale of plan
   3. characteristics of ground
   The correct answer is ?

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

4. 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________________?

   A. 98.70
   B. 100.00
   C. 102.30
   D. 103.30

5. 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

6. 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

7. The cross hairs in the surveying telescope are placed_____________?

   A. midway between eye piece and objec¬tive lens
   B. much closer to the eye-piece than to the objective lens
   C. much closer to the objective lens than to the eye piece
   D. anywhere between eye-piece and objective lens

8. The adjustment of horizontal cross hair is required particularly when the instrument is used for_____________?

   A. leveling
   B. prolonging a straight line
   C. measurement of horizontal angles
   D. all of the above

9. The number of horizontal cross wires in a stadia diaphragm is ________________?

   A. one
   B. two
   C. three
   D. four

10. Which of the following errors can be eliminated by taking mean of bot face observations ?

    A. error due to imperfect graduations
    B. error due to eccentricity of verniers
    C. error due to imperfect adjustment of plate levels
    D. error due to line of collimation not being perpendicular to horizontal axis