26. True meridians are generally preferred to magnetic meridians because
27. If θ is the slope of the ground and l is the measured distance, the correction is
28. The most reliable method of plotting a theodolite traverse, is
29. The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to
30. Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to
31. The probable error of the adjusted bearing at the middle is
32. The bearings of the lines AB and BC are 146° 30' and 68° 30'. The included angle ABC is
33. For a closed traverse the omitted measurements may be calculated
34. The slope correction for a length of 30 m along a gradient of 1 in 20, is
35. The main principle of surveying is to work
36. For the construction of highway (or railway)
37. If the radius of a simple curve is R, the length of the chord for calculating offsets by the method of chords produced, should not exceed.
38. The sensitiveness of a level tube decreases if
39. For true difference in elevations between two points A and B, the level must be set up
40. ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is
41. Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than
42. An ideal transition curve is
43. Pantagraph is used for
44. If the angular measurements of a traverse are more precise than its linear measurements, balancing of the traverse, is done by
45. The branch of surveying in which both horizontal and vertical positions of a point, are determined by making instrumental observations, is known
46. In levelling operation
47. If the rate of gain of radial acceleration is 0.3 m per sec3 and full centrifugal ratio is developed. On the curve the ratio of the length of the transition curve of same radius on road and railway, is
48. The angle between two plane mirrors of optical square, is
49. The latitude of a traverse leg is obtained by multiplying its length by
50. The Pallivasal hydroelectric project was started in Kerala by?