A. the forebearing of AB and back bearing of AB differ by 180°
B. the forebearing of AB and back bearing of BA differ by 180°
C. both (A. and (B. are correct.
D. none is correct
✅ The correct answer is option A.
Surveying MCQs
12. A series of closely spaced contour lines represents a___________________?
A. steep slope
B. gentle slope
C. uniform slope
D. plane surface
✅ The correct answer is option A.
13. If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is_________________?
A. 99.345 m
B. 100.345 m
C. 100.655m
D. 101.870m
✅ The correct answer is option A.
14. The sensitivity of a bubble tube can be increased by________________?
A. increasing the diameter of the tube
B. decreasing the length of bubble
C. increasing the viscosity of liquid
D. decreasing the radius of curvature of tube
✅ The correct answer is option A.
15. 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
✅ The correct answer is option A.
16. A telescope is said to be inverted if its______________?
A. vertical circle is to its right and the bubble of the telescope is down
B. vertical circle is to its right and the bubble of the telescope is up
C. vertical circle is to its left and the bubble of the telescope is down
D. vertical circle is to its left and the bubble of the telescope is up
✅ The correct answer is option A.
17. 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
✅ The correct answer is option A.
18. The suitable contour interval for a map with scale 1 : 10000 is______________?
A. 2 m
B. 5m
C. 10 m
D. 20 m
✅ The correct answer is option A.
19. 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
✅ The correct answer is option B.
20. Detailed plotting is generally done by________________?
A. radiation
B. traversing
C. resection
D. all of the above
✅ The correct answer is option A.