81. A plane through a point is plane tagentid to level surface at that point called
82. The variation caused by the oscillation of magnetic needle due to magnetic storms called . . . . . . . .
83. In which the instrument the telescope has small motion about horizontal axis . . . . . . . .
84. A rod painted alternately red and white and used for marking stations called
85. What is the hypotenusal allowance for a chain of length 30m while chaining on slop of ? . . . . . . . .
86. The principle of reversal for level and theodolite is . . . . . . . .
87. In prismatic compass this carries magnetic needle . . . . . . . .
88. The basic principle automatic level is that entering . . . . . . . . always passes through the cross hairs even though the telescope is inclined slightly.
89. For checking closed traverse the algebric sum of all latitudes should be equal to
90. It is the imaginary line tangential to the longitudinal curve of the tube at the middle point called . . . . . . . .
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