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Surveying Quiz | Surveying Short Questions and Answers

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Questions
41 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
A d
B 1/d
C d2
D 1/d2

Answer: d2
42 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

Answer: 105.20 m
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43 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

Answer: partially eliminates curvature correction
44 With the rise of temperature, the sensitivity of a bubble tube
A decreases
B increases
C remains unaffected
D none of the above

Answer: decreases
45 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

Answer: increasing the diameter of the tube
46 The difference between a level line and a horizontal line is that
A level line is a curved line while horizontal 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

Answer: level line is a curved line while horizontal line is a straight line
47 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

Answer: less than true R.L.
48 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

Answer: provides a check on the reduction of intermediate point levels
49 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 these

Answer: quicker and less tedious for large number of intermediate sights
50 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

Answer: error due to both curvature and re-fraction
51 In an internal focussing type of telescope, the lens provided is
A concave
B convex
C plano-convex
D plano-concave

Answer: concave
52 If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is
A 99.345 m
B 100.345 m
C 100.655m
D 101.870m

Answer: 99.345 m
53 The rise and fall method of levelling provides a complete check on
A backsight
B intermediate sight
C foresight
D all of the above

Answer: all of the above
54 The following sights are taken on a “turning point”
A foresight only
B backsight only
C foresight and backsight
D foresight and intermediate sight

Answer: foresight and backsight
55 A’level line’is a
A horizontal line
B line parallel to the mean spheriodal surface of earth
C line passing through the center of cross hairs and the center of eye piece
D line passing through the objective lens and the eye-piece of a dumpy or tilting level

Answer: line parallel to the mean spheriodal surface of earth
56 If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to

i) altitude bubble on index frame

ii) altitude bubble on index frame if it is to be used as a level

iii) altitude bubble on telescope

iv) altitude bubble on telescope if it is to be used as a level The correct answer is

A only (i)
B both (i) and (iv)
C only (iii)
D both (ii) and (iii)

Answer: both (i) and (iv)
57 a tripod settles in the interval that elapses between taking a back sight reading and the following foresight reading, then the elevation of turning point will
A increase
B decrease
C not change
D None of these

Answer: increase
58 Which of the following errors cannot be eliminated by taking both face observations ?
A error due to horizontal axis not being perpendicular to the vertical axis
B index error i.e. error due to imperfect adjustment of the vertical circle vernier
C error due to non-parallelism of the axis of telescope level and line of collimation
D none of the above

Answer: none of the above
59 Which of the following errors can be eliminated by taking mean of bot face observations ?
A error due to imperfect graduations
B error due to eccentricity of verniers
C error due to imperfect adjustment of plate levels
D error due to line of collimation not being perpendicular to horizontal axis

Answer: error due to line of collimation not being perpendicular to horizontal axis
60 Sensitiveness of a level tube is designated by
A radius of level tube
B length of level tube
C length of bubble of level tube
D none of the above

Answer: radius of level tube