41. The sensitiveness of a level tube decrease if . . . . . . . .
42. At a place where the declination is 4°E the magnetic bearing of line is 181°. The true bearing of the same is . . . . . . . .
43. Most of the General Theodolites can read angles up to . . . . . . . .
44. Reciprocal levelling is done to find out.
45. It is an imaginary line on the ground obtained by joining points have same elivation called . . . . . . . .
46. The introduction of additional concave lens inside telescope results is reduction of . . . . . . . . of the image formed by the object lens.
47. In a metric chain each link is equal to . . . . . . . .
48. In the obstacle survey as shown in figure the width of river AB is equal to . . . . . . . .
49. The phenomenon by which a magnetic needle is deflected by the presence of masses of iron or steel called . . . . . . . .
50. Name the surveying method based on trigonometry.
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