51. Which of the following errors can be neutralised by setting the level midway between the two stations ?
a) error due to curvature only
b) error due to refraction only
c) error due to both curvature and re-fraction
d) none of the above
Ans: c
52. Height of instrument method of levelling is
a) more accurate than rise and fall method
b) less accurate than rise and fall method
c) quicker and less tedious for large number of intermediate sights
d) none of the above
Ans: c
53. The rise and fall method
a) is less.accurate than height of instrument method
b) is not suitable for levelling with tilting levels
c) provides a check on the reduction of intermediate point levels
d) quicker and less tedious for large number of intermediate sights
Ans: c
54. If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be
a) true R.L.
b) more than true R.L.
c) less than true R.L.
d) none of the above
Ans: c
55. The difference between a level line and a horizontal line is that
a) level line is a curved line while hori-zontal line is a straight line
b) level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
c) horizontal line is normal to plumb line while level line may not be normal to the plumb line
d) both are same
Ans: a
56. The sensitivity of a bubble tube can be increased by
a) increasing the diameter of the tube
b) decreasing the length of bubble
c) increasing the viscosity of liquid
d) decreasing the radius of curvature of tube
Ans: a
57. With the rise of temperature, the sensitivity of a bubble tube
a) decreases
b) increases
c) remains unaffected
d) none of the above
Ans: a
58. Refraction correction
a) completely eliminates curvature correction
b) partially eliminates curvature correction
c) adds to the curvature correction
d) has no effect on curvature correction
Ans: b
59. 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
a) 94.80 m
b) 99.71 m
c) 100.29 m
d) 105.20 m
Ans: d
60. 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
a) 98.70
b) 100.00
c) 102.30
d) 103.30
Ans: b
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a) error due to curvature only
b) error due to refraction only
c) error due to both curvature and re-fraction
d) none of the above
Ans: c
52. Height of instrument method of levelling is
a) more accurate than rise and fall method
b) less accurate than rise and fall method
c) quicker and less tedious for large number of intermediate sights
d) none of the above
Ans: c
53. The rise and fall method
a) is less.accurate than height of instrument method
b) is not suitable for levelling with tilting levels
c) provides a check on the reduction of intermediate point levels
d) quicker and less tedious for large number of intermediate sights
Ans: c
54. If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be
a) true R.L.
b) more than true R.L.
c) less than true R.L.
d) none of the above
Ans: c
55. The difference between a level line and a horizontal line is that
a) level line is a curved line while hori-zontal line is a straight line
b) level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
c) horizontal line is normal to plumb line while level line may not be normal to the plumb line
d) both are same
Ans: a
56. The sensitivity of a bubble tube can be increased by
a) increasing the diameter of the tube
b) decreasing the length of bubble
c) increasing the viscosity of liquid
d) decreasing the radius of curvature of tube
Ans: a
57. With the rise of temperature, the sensitivity of a bubble tube
a) decreases
b) increases
c) remains unaffected
d) none of the above
Ans: a
58. Refraction correction
a) completely eliminates curvature correction
b) partially eliminates curvature correction
c) adds to the curvature correction
d) has no effect on curvature correction
Ans: b
59. 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
a) 94.80 m
b) 99.71 m
c) 100.29 m
d) 105.20 m
Ans: d
60. 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
a) 98.70
b) 100.00
c) 102.30
d) 103.30
Ans: b
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