1. The inclination of the magnetic needle to the horizontal called . . . . . . . .
2. Asurvey plan is drawn to a scale of 1 : 10000. A plot on the plan measures 50 mm × 80 mm. What is the area in hectar.
3. A survey done in conneciion with projects such as roads, railways etc is called
4. In prismatic compass, this carries a horse air . . . . . . . .
5. The methods of contouring are . . . . . . . .
6. A perpendicular to chain line is set by . . . . . . . .
7. The best method of folding a chain is to . . . . . . . .
8. The arrangement of levelling tube is . . . . . . . .
9. A source of local attraction for prismatic compass is . . . . . . . .
10. A page from a chain book is shown in fig. The width of river AB is equal to
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