Surveying problems
- 1. The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, is known
Options- A. declination
- B. azimuth
- C. dip
- D. bearing. Discuss
Correct Answer: dip
- 2. An ideal transition curve is
Options- A. cubic parabola
- B. cubic spiral
- C. clothoid spiral
- D. true spiral. Discuss
Correct Answer: clothoid spiral
Explanation:
IRC recommends Spiral or clothoid as the ideal transition curve due to following reasons:
1. It satisfies that rate of change of centrifugal acceleration is constant i.e., Ls.R = constant. Where Ls = length of transition curve R = radius of curve.
2. The calculation and field implementation of spiral curve is simple and easy.
3. It enhances aesthetics also.
- 3. In levelling operation
Options- A. when the instrument is being shifted, the staff must not be moved
- B. when the staff is being carried forward, the instrument must remain stationary
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b)
- 4. Pantagraph is used for
Options- A. measuring distances
- B. measuring areas
- C. enlarging or reducing plans
- D. setting out right angles Discuss
Correct Answer: enlarging or reducing plans
- 5. The sum of the interior angles of a geometrical figure laid on the surface of the earth differs from that of the corresponding plane figure only to the extent of one second for every
Options- A. 100 sq. km of area
- B. 150 sq. km of area
- C. 200 sq. km of area
- D. none of these. Discuss
Correct Answer: 200 sq. km of area
- 6. Centering error of a theodolite produces an error
Options- A. in all angles equally
- B. which does not vary with the direction or pointing
- C. which varies with the direction of pointing and inversely with the length of sight
- D. none of these. Discuss
Correct Answer: which varies with the direction of pointing and inversely with the length of sight
- 7. Let angular value of one graduation of a tube of length x be ? seconds and R be the radius of its internal curved surface, then
Options- A.
- B.
- C.
- D.
.
Discuss
Correct Answer:
- 8. When the bubble of the level tube of a level, remains central
Options- A. line of sight is horizontal
- B. axis of the telescope is horizontal
- C. line of collimation is horizontal
- D. geometrical axis of the telescope is horizontal. Discuss
Correct Answer: line of sight is horizontal
- 9. The angle between two plane mirrors of optical square, is
Options- A. 20°
- B. 30°
- C. 45°
- D. 60°
- E. 90°. Discuss
Correct Answer: 45°
- 10. In optical reading instruments
Options- A. the vertical circle is usually continuous from 0° to 359°
- B. the readings increase when the telescope is elevated in the face left position
- C. the readings decrease when the telescope is elevated in the face right position
- D. all the above. Discuss
Correct Answer: all the above.
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