Surveying and Levelling

361. When the bubble of the level tube of a level, remains central

1. Line of sight is horizontal
2. Axis of the telescope is horizontal
3. Line of collimation is horizontal
4. Geometrical axis of the telescope is horizontal

View answer

362. Which of the following introduces an error of about 1 in 1000 if 20 m chain is used?

1. Length of chain 20 mm wrong
2. One end of the chain 0.9 m off the line
3. One end of chain 0.9 m higher than the other
4. All the above

View answer

363. Which of the following methods of contouring is most suitable for a hilly terrain?

1. Direct method
2. Square method
3. Cross-sections method
4. Tachometric method

View answer

364. Which of the following methods of plane table surveying is used to locate the position of an inaccessible point?

1. Radiation
2. Intersection
3. Traversing
4. Resection

View answer

365. Which of the following methods of theodolite traversing is suitable for locating the details which are far away from transit stations?

1. Measuring angle and distance from one transit station
2. Measuring angles to the point from at least two stations
3. Measuring angle at one station and distance from other
4. Measuring distance from two points on traverse line

View answer

366. Which of the following statements is incorrect?

1. Error due to refraction may not be completely eliminated by reciprocal levelling
2. Tilting levels are commonly used for precision work
3. The last reading of levelling is always a foresight
4. All of the above statements are incorrect

View answer

367. Which one of the following mistakes/errors may be cumulative + or - :

1. Bad ranging
2. Bad straightening
3. Erroneous length of chain
4. Sag

View answer

368. Which one of the following procedures for getting accurate orientation is the most distinctive feature of the art of plane tabling?

1. Radiation
2. Intersection
3. Traversing
4. Resection

View answer

369. Which one of the following statements is correct?

1. When the axes of rotation of the graduated circle and the verniers are not coincident, the instrument possesses eccentricity
2. The mean of the readings of the two verniers gives correct reading free from the eccentricity
3. One Vernier may be used if the readings of two verniers differ by a constant
4. All the above

View answer

370. While measuring a chain line between two stations and intervened by a raised ground

1. Vision gets obstructed
2. Chaining gets obstructed
3. Both vision and chaining get obstructed
4. All the above

View answer