51. The sum of exterior angles in closed traverse is equal to . . . . . . . .
52. The line joining the point of intersection of the cross wires of the diaphragm to optical centre of objective and its imaginary continuation called . . . . . . . .
53. What do you mean by subsidance survey . . . . . . . .
54. The axis of striding level must be . . . . . . . . horizontal axis.
55. In theodolite, all the following axis are same, except . . . . . . . .
56. Axis of plate levels must be . . . . . . . . to vertical axis.
57. Determination of difference levels of two points which are quite apart can be done by . . . . . . . .
58. In a 20m chain the end of 2nd link after 1 pointer figure reads . . . . . . . .
59. In a prismatic compass the device provided to bring the graduated ring to rest.
60. Transit theodolite is a . . . . . . . .
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