21. The main purpose of land surveying is to . . . . . . . .
22. It is the smallest value that can red from the instrument called . . . . . . . .
23. The sum of included angles of closed traverse ABCDEFGA is . . . . . . . .
24. The purpose of the reflecting mirror is prismatic compass to observe the
25. The bearing which is indicated by freely suspending a magnetic needle and uneffected by local attractive forces is called . . . . . . . .
26. Pacing is the method adopted to determine the distance in . . . . . . . .
27. Simplest instrument used to measure the angle of surface slope in chain survey is . . . . . . . .
28. The angle between the back tangent and forward tangent called . . . . . . . .
29. GPS gives height from . . . . . . . .
30. A survey in which effect of earth's curvature is neglected.
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