Surveying and Levelling

271. The horizontal angle between true meridian and magnetic meridian, is known

1. Bearing
2. Magnetic declination
3. Dip
4. Convergence

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272. The Huygens telescope eye piece

1. Is aplanatic
2. Achromatic
3. Both (a) and (b)
4. Neither (a) nor (b)

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273. The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as

1. Line of sight
2. Line of collimation
3. Axis of the telescope
4. None of these

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274. The included angles of a theodolite traverse, are generally measured

1. Clockwise from the forward station
2. Anti-clockwise from the back station
3. Anti-clockwise from the forward station
4. Clockwise from the back station

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275. The instrument used for accurate centering in plane table survey is

1. Spirit level
2. Alidade
3. Plumbing fork
4. Trough compass

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276. The instrument which is used in plane tabling for obtaining horizontal and vertical distances directly without resorting to chaining, is known as

1. Plane alidade
2. Telescopic alidade
3. Clinometer
4. Tacheometer

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277. The intercept of a staff

1. Is maximum if the staff is held truly normal to the line of sight
2. Is minimum if the staff is held truly normal to the line of sight
3. Decreases if the staff is tilted away from normal
4. Increases if the staff is tilted towards normal

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278. The latitude of a traverse leg is obtained by multiplying its length by

1. Tangent of its reduced bearing
2. Sign of its reduced bearing
3. Cosine of its reduced bearing
4. Cosecant of its reduced bearing

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279. The least count of a Vernier scale is

1. Sum of the smallest divisions of main and Vernier scales
2. Value of one division of the primary scale divided by total number of divisions of Vernier scale
3. Value of one division of Vernier scale divided by total number of divisions of primary scale
4. None of these

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280. The length of a traverse leg may be obtained by multiplying the latitude and

1. Secant of its reduced bearing
2. Sine of its reduced bearing
3. Cosine of its reduced bearing
4. Tangent of its reduced bearing

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