Surveying and Levelling

261. The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

1. Equidistant from A and B
2. Closer to the higher station
3. Closer to the lower station
4. As far as possible from the line AB

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262. The direction of steepest slope on a contour, is

1. Along the contour
2. At an angle of 45° to the contour
3. At right angles to the contour
4. None of these

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263. The distance between steps for measuring downhill to obtain better accuracy

1. Decreases with decrease of slope
2. Increases with increase of slope
3. Decreases with increase of slope
4. Decreases with decrease of weight of the chain

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264. The distance between terminal points computed from a subsidiary traverse run between them, is generally known, as

1. Traverse leg
2. A base
3. Traverse base
4. All the above

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265. The distance between the point of intersection of an upgrade +g₁% and downgrade g₂% and the highest point of the vertical curve of length L, is

1. L (g₁ - g₂)/400
2. + (g₁ + g₂)/400
3. + (g₁ + g₂)/800
4. - (g₁ - g₂)/800

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266. The distances AC and BC are measured from two fixed points A and B whose distance AB is known. The point C is plotted by intersection. This method is generally adopted in

1. Chain surveying
2. Traverse method of surveys
3. Triangulation
4. None of these

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267. The first reading from a level station is

1. Foresight
2. Intermediate sight
3. Back-sight
4. Any sight

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268. The 'fix' of a plane table from three known points, is good, if

1. Middle station is nearest
2. Middle station is farthest
3. Either the right or left station is nearest
4. None of these

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269. The 'fix' of a plane table station with three known points, is bad if the plane table station lies

1. In the great triangle
2. Outside the great triangle
3. On the circumference of the circumscribing circle
4. None of these

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270. The formula for the horizontal distances for inclined sights, on staff held normalis (f/i) s cos θ + (f + d) cos θ ± h sin θ

1. Minus sign is used for angle of depression
2. Plus sign is used for angle of depression
3. Minus sign is used for angle of elevation
4. None of these

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