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_______________?

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. 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

3. 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

4. The error due to eccentricity of inner and outer axes can be eliminated by________________?

   A. reading both verniers and taking the mean of the two
   B. taking both face observations and taking the mean of the two
   C. double sighting
   D. taking mean of several readings distributed over different portions of the graduated circle

5. The horizontal angle between the true meridian and magnetic meridian at a place is called______________?

   A. azimuth
   B. declination
   C. local attraction
   D. magnetic bearing

6. The difference between a level line and a horizontal line is that_______________?

   A. level line is a curved line while hori-zontal line is a straight line
   B. level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
   C. horizontal line is normal to plumb line while level line may not be normal to the plumb line
   D. both are same

7. The permissible error in chaining for measurement with chain on rough or hilly ground is_____________?

   A. 1 in 100
   B. 1 in 250
   C. 1 in 500
   D. 1 in 1000

8. In the double application of principle of reversion, the apparent error is_______________?

   A. equal to true error
   B. half the true error
   C. two times the true error
   D. four times the true error

9. The process of turning the telescope about the vertical axis in horizontal plane is known as______________?

   A. transiting
   B. reversing
   C. plunging
   D. swinging

10. Horizontal distances obtained by thermometric observations_________________?

    A. require slope correction
    B. require tension correction
    C. require slope and tension corrections
    D. do not require slope and tension corrections