### Surveying Set 3

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on Surveying Set 3

Q1 | Which of the following errors can be neutralised by setting the level midwaybetween the two stations ?
• error due to curvature only
• error due to refraction only
• error due to both curvature and re-fraction
• none of the above
Q2 | Height of instrument method of levelling is
• more accurate than rise and fall method
• less accurate than rise and fall method
• quicker and less tedious for large number of intermediate sights
• none of the above
Q3 | The rise and fall method
• is less.accurate than height of instrument method
• is not suitable for levelling with tilting levels
• provides a check on the reduction of intermediate point levels
• quicker and less tedious for large number of intermediate sights
Q4 | If the staff is not held vertical at a level¬ling station, the reduced level calculatedfrom the observation would be
• true R.L.
• more than true R.L.
• less than true R.L.
• none of the above
Q5 | The difference between a level line and a horizontal line is that
• level line is a curved line while hori-zontal line is a straight line
• level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
• horizontal line is normal to plumb line while level line may not be normal to the plumb line
• both are same
Q6 | The sensitivity of a bubble tube can be increased by
• increasing the diameter of the tube
• decreasing the length of bubble
• increasing the viscosity of liquid
• decreasing the radius of curvature of tube
Q7 | With the rise of temperature, the sensitivity of a bubble tube
• decreases
• increases
• remains unaffected
• none of the above
Q8 | Refraction correction
• completely eliminates curvature correction
• partially eliminates curvature correction
• adds to the curvature correction
• has no effect on curvature correction
Q9 | The R.L, of the point A which is on the floor is 100 m and back sight reading on A is 2.455 m. If the foresight reading on the point B which is on the ceiling is 2.745 m, the R.L. of point B will be
• 94.80 m
• 99.71 m
• 100.29 m
• 105.20 m
Q10 | As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be
• 98.7
• 100
• 102.3
• 103.3
Q11 | If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
• d
• 1/d
• d2
• 1/d2
Q12 | Sensitiveness of a level tube is designated by
• length of level tube
• length of bubble of level tube
• none of the above
Q13 | Which of the following statements is in-correct ?
• Error due to refraction may not be completely eliminated by reciprocal levelling.
• Tilting levels are commonly used for precision work.
• The last reading of levelling is always a foresight.
• All of the above statements are incorrect.
Q14 | Dumpy level is most suitable when
• the instrument is to be shifted frequently
• fly levelling is being done over long distance
• many readings are to be taken from a single setting of the instrument
• all of the above
Q15 | The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be
• equidistant from A and B
• closer to the higher station
• closer to the lower station
• as far as possible from the line AB
Q16 | Contour interval is
• inversely proportional to the scale of the map
• directly proportional to the flatness of ground
• larger for accurate works
• larger if the time available is more
Q17 | An imaginary line lying throughout the surface of ground and preserving aconstant inclination to the horizontal is known as
• contour line
• horizontal equivalent
• contour interval
Q18 | The suitable contour interval for a map with scale 1 : 10000 is
• 2 m
• 5m
• 10 m
• 20 m
Q19 | Select the correct statement.
• A contour is not necessarily a closed curve.
• A contour represents a ridge line if the concave side of lower value con¬tour lies towards the higher value contour.
• Two contours of different elevations do not cross each other except in case of an overhanging cliff.
• All of the above statements are correct.
Q20 | A series of closely spaced contour lines represents a
• steep slope
• gentle slope
• uniform slope
• plane surface
Q21 | Direct method of contouring is
• a quick method
• adopted for large surveys only
• most accurate method
• suitable for hilly terrains
Q22 | In direct method of contouring, the process of locating or identifying pointslying on a contour is called
• ranging
• centring
• horizontal control
• vertical control
Q23 | In the cross-section method of indirect contouring, the spacing of cross-sections depends uponi) contour intervalii) scale of planiii) characteristics of groundThe correct answer is
• only (i)
• (i)and(ii)
• (ii) and (iii)
• (i), (ii) and (iii)
Q24 | Which of the following methods of con-touring is most suitable for a hillyterrain ?
• direct method
• square method
• cross-sections method
• tacheometric method
Q25 | Select the correct statement.
• Contour interval on any map is kept constant.
• Direct method of contouring is cheaper than indirect method.
• Inter-visibility of points on a contour map cannot be ascertained.
• Slope of a hill cannot be determined with the help of contours.