21. The dip of magnetic needle on the equator will be . . . . . . . .
22. The electronic planimeter is also called as . . . . . . . .
23. In a travese in ABCDA in compassuring the angular error should not exceed
24. The magnetic bearing of a line is 140° 30'. The declination is 2° 30' E, the true bearing is . . . . . . . .
25. The length of a good graphical scale should be . . . . . . . .
26. By taking back sight and fore sight reading to eliminate the . . . . . . . .
27. The least reading we will get from 4m levelling staff is . . . . . . . .
28. The example of instrumental error in compass is . . . . . . . .
29. The unit of angular measurement in survey work is . . . . . . . .
30. The surface which is parallel to mean surface of earth called . . . . . . . .
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