# Surveying Quiz | Surveying Short Questions and Answers

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

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

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

44 With the rise of temperature, the sensitivity of a bubble tube
A decreases
B increases
C remains unaffected
D none of the above

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

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

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

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

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

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)

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

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

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