11. For accuracy in measurement we should prefer . . . . . . . .
12. Which of the following system is used to working out the reduce levels of points from the staff readings taken in the field.
13. The formule for correction of refraction in meters.
14. A sign of correction for slope is always . . . . . . . .
15. Due to local attraction incorrect readings are obtained from the presmatic compass the reason could be . . . . . . . .
16. The elevation of a point as its vertical distance above or below a reference level called . . . . . . . .
17. The closing error in traverse conducted by compass survey is adjusted graphically by . . . . . . . . rule.
18. The dip of the needle is . . . . . . . . near the equator than near the poles.
19. The GPS sattelites orbital planes are inclined to the equator and spaced in the longitude, The inclination and spacing of the longtitude in degree are . . . . . . . .
20. The F.B and B.B of each line are essentially recorded in the field for . . . . . . . .
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