Surveying and Levelling

231. The angle of intersection of a curve is the angle between

1. Back tangent and forward tangent
2. Prolongation of back tangent and forward tangent
3. Forward tangent and long chord
4. Back tangent and long chord

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232. The apparent error on reversal is

1. Equal to the actual error
2. Twice the actual error
3. Thrice the actual error
4. None of these

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233. The approximate formula for radial or perpendicular offsets from the tangent, is

1. x/2R
2. x²/2R
3. x/R
4. x²/R

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234. The area of a plane triangle ABC, having its base AC and perpendicular height , is

1. ½ bh
2. ½ ba sin C
3. ½ bc sin A
4. All the above

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235. The area of any irregular figure of the plotted map is measured with

1. Pentagraph
2. Sextant
3. Clinometer
4. Planimeter

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236. The back staff reading on a B.M. of R.L. 500.000 m is 2.685 m. If foresight reading on a point is 1.345 m, the reduced level of the point, is

1. 502.685 m
2. 501.345 m
3. 501.340 m
4. 504.030 m

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237. The bearing of AB is 190° and that of CB is 260° 30'. The included angle ABC, is

1. 80° 30'
2. 99° 30'
3. 70° 30'
4. None of these

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238. The bearing of C from A is N 30° E and from B, 50 metres east of A, is N 60° W. The departure of C from A is

1. 50 m
2. 50 m
3. 25 m
4. 25 m

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239. The bearing of line AB is 152° 30' and angle ABC measured clockwise is 124° 28'. The bearing of BC is

1. 27° 52'
2. 96° 58'
3. 148° 08'
4. 186° 58'

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240. The bearing of lines OA and OB are 16° 10' and 332° 18', the value of the included angle BOA is

1. 316° 10'
2. 158° 28'
3. 348° 08'
4. 43° 52'

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