Surveying and Levelling

371. While measuring the distance between two points along upgrade with the help of a 20 m chain, the forward end of the chain is shifted forward through a distance

1. 20 (sin θ - 1)
2. 20 (cos θ - 1)
3. 20 (sec θ - 1)
4. 20 (cosec θ - 1)

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372. While measuring with a metallic tape of 30 m length pull should be applied

1. 1 kg
2. 2 kg
3. 3 kg
4. 4 kg

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373. While rotating the theodolite in the horizontal plane, the bubble of the bubble tube takes up the same position in its tube, it indicates

1. The rotation axis is vertical
2. The trunnion axis is horizontal
3. The line of collimation is perpendicular to vertical axis
4. None of the above

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374. While setting a plane table at a station it was found that the error in centering was 30 cm away from the ray of length 40 m drawn from the station. If the scale of the plan is 1 cm = 2 cm, the displacement of the end of the ray in plan from the true position will be

1. 0.02 cm
2. 0.15 cm
3. 0.2 cm
4. 0.1 cm

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375. While surveying a plot of land by plane tabling, the field observations

1. And plotting proceed simultaneously
2. And plotting do not proceed simultaneously
3. And recorded in field books to be plotted later
4. All the above

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376. While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is

1. Correctly focussed
2. Not correctly focussed
3. Said to have parallax
4. Free from parallax

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377. While working on a plane table, the correct rule is:

1. Draw continuous lines from all instrument stations
2. Draw short rays sufficient to contain the points sought
3. Intersection should be obtained by actually drawing second rays
4. Take maximum number of sights as possible from each station to distant objects

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378. Whole circle bearing of a line is preferred to a quadrantal bearing merely because

1. Bearing is not completely specified by an angle
2. Bearing is completely specified by an angle
3. Sign of the correction of magnetic declination is different in different quadrants
4. Its Trigonometrical values may be extracted from ordinary tables easily

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379. With the rise of temperature, the sensitivity of a bubble tube

1. Decreases
2. Increases
3. Remains unaffected
4. None of the above

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380. With usual notations, the expression V²/gR represents

1. Centrifugal force
2. Centrifugal ratio
3. Super elevation
4. Radial acceleration

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