21. Triangulation surveys are carried out for providing
22. The point at which sun's declination changes from north to south, is known as
23. Contour interval is
24. If ‘f’ is the focal length of the camera lens and ‘θ’ is the angle of tilt, the distance of the plumb point from the principal point will be
25. Pick up the incorrect statement from the following. In a spherical triangle
26. If the image of a triangulation station of R.L. 500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be
27. The process of turning the telescope about the vertical axis in horizontal plane is known as
28. For mapping any country
29. In the prismatic compass
30. If a star whose declination is 60° N culminates at zenith, its altitude at the lower culmination, is
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