21. Agate cap is fitted with a
22. International Date Line is located along
23. The length of a chain is measured from
24. The nautical mile is the length of
25. If the equatorial distance between two meridians is 100 km, their distance at 60° latitude will be
26. The scale of the photography taken from a height of 300 m, with a camera of focal length 15 cm, is
27. In an internal focussing type of telescope, the lens provided is
28. Which of the following is not the function of levelling head ?
29. Local attraction in compass surveying may exist due to
30. A Nautical mile is
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