The angle of intersection of the two plane mirrors of an optical square is______________?

Related Mcqs:

1. 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)

2. Intersection method of detailed plotting is most suitable for________________?

   A. forests
   B. urban areas
   C. hilly areas
   D. plains

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

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

4. 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

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

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

6. 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

7. 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)

8. 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

9. Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

   A. error due to eccentricity of verniers
   B. error due to displacement of station signals
   C. error due to wrong adjustment of line of collimation and trunnion axis
   D. error due to inaccurate graduation

10. The angle between the prolongation of the preceding line and the forward line of a traverse is called ________________?

    A. deflection angle
    B. included angle
    C. direct angle
    D. none of the above