Mine Surveying - Study Mode
[#21] The method is employed when the horizontal sights are not possible in tacheometry . . . . . . . .
Correct Answer
(A) Fixed hair
[#22] The bearing of a line AB is 70°. The bearing of the line BA is . . . . . . . .
Correct Answer
(C) 250
[#23] In levelling operation . . . . . . . .
Correct Answer
(C) Both A and B
[#24] The arithametical check for rise and fall method are . . . . . . . .
Correct Answer
(A) $$sum {BS} - sum {FS} = { ext{Last}},{ ext{RL}} - { ext{First}},{ ext{RL}} = sum {{ ext{Rise}}} - sum {{ ext{Fall}}} $$
[#25] If the respective bearings of lines OA and OB are 31° 45' and 149° 15' from station "O" the value of angle AOB is equal to . . . . . . . .
Correct Answer
(D) 117° 30'