Wednesday 25 January 2017

Mcqs on Surveying

71. A'level line'is a
a) horizontal line
b) line parallel to the mean spheriodal surface of earth
c) line passing through the centre of cross hairs and the centre of eye piece
d) line passing through the objective lens and the eye-piece of a dumpy or tilting level
Ans: b

72. The following sights are taken on a "turning point"
a) foresight only
b) backsight only
c) foresight and backsight
d) foresight and intermediate sight
Ans: c

73. The rise and fall method of levelling provides a complete check on
a) backsight
b) intermediate sight
c) foresight
d) all of the above
 Ans: d

74. 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
Ans: a

75. In an internal focussing type of telescope, the lens provided is
a) concave
b) convex
c) plano-convex
d) plano-concave
Ans: a

76. 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

77. 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

78. The rise and fall method
a) is less.accurate than height of instru-ment 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

79.   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

80. Different grades are joined together by a
a) compound curve
b) transition curve
c) reverse curve
d) vertical curve
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