11. Three point problem can be solved by
12. The zenith is the point on the celestial sphere
13. The allowable length of an offset depends upon the
14. The great circle whose plane is perpendicular to the axis of rotation of the earth, is called
15. The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called
16. To obtain photographs of an area of 1000 m average elevation, on scale 1 : 30,000, with a camera of 30 cm focal length, the flying height is
17. The difference of height of two points whose parallax difference is 0.8 mm on a pair of stereo pair taken from a height ‘H’ is 100 m. If mean photo base is 95.2 mm, the flying height is
18. The correction for parallax, is
19. The Polaris describes a small circle round the pole whose radius is approximately
20. Sensitiveness of a level tube is designated by
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