Wednesday 25 January 2017

Surveying: Multiple Choice Questions and Answers

61. The cross hairs in the surveying telescope are placed
a) midway between eye piece and objec¬tive lens
b) much closer to the eye-piece than to the objective lens
c) much closer to the objective lens than to the eye piece
d) anywhere between eye-piece and objective lens
Ans: b

62. For which of the following permanent adjustments of theodolite, the spire test is used ?
a) adjustment of plate levels
b) adjustment of line of sight
c) adjustment of horizontal axis
d) adjustment of altitude bubble and vertical index frame
Ans: c

63. The adjustment of horizontal cross hair is required particularly when the instrument is used for
a) levelling
b) prolonging a straight line
c) measurement of horizontal angles
d) all of the above
Ans: a

64. Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?
a) error due to eccentricity of verniers
b) error due to displacement of station signals
c) error due to wrong adjustment of line of collimation and trunion axis
d) error due to inaccurate graduation
Ans: b

65. The error due to eccentricity of inner and outer axes can be eliminated by
a) reading both verniers and taking the mean of the two
b) taking both face observations and taking the mean of the two
c) double sighting
d) taking mean of several readings dis-tributed over different portions of the graduated circle
Ans: a

66. In the double application of principle of reversion, the apparent error is
a) equal to true error
b) half the true error
c) two times the true error
d) four times the true error
Ans: d

67. Which of the following errors can be eliminated by taking mean of botr> 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
Ans: d

68. Which of the following errors cannot be eliminated by taking both face observa-tions ?
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 thc-axis of telescope level and line of collimation
d) none of the above
Ans: d

69. If 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) either 'a' or 'b'
Ans: a

70. 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)
Ans: b
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