61. It is said to be the dip when the north end of a freely floating and properly balanced magnetic needle is . . . . . . . .
62. A rod used to measure from a line to locate a point is called . . . . . . . .
63. The basis for trigonometric survey is . . . . . . . .
64. A 400 Sq.m area is responded by 400 sq.mm on plan. The scale of the plan is
65. Buildings are set on the ground by . . . . . . . .
66. The variations produced by the oscillation of a magnetic needle from its mean position during the day . . . . . . . .
67. The tacheometric surveying is adopted in . . . . . . . . terrain.
68. The closing error in plotting closed traverse survey is . . . . . . . .
69. The F.B of a line AB is 145° and that of BC is 58° the angle ABC.
70. The accuracy of measurement for determing the depth of vertical shaft would be
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