Most recently asked Surveying lab viva questions with answers pdf

81. 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

82. 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

83. With the rise of temperature, the sensiti¬vity of a bubble tube
a) decreases
b) increases
c) remains unaffected
d) none of the above
Ans: a

84.      Refraction correction
a) completely eliminates curvature cor-rection
b) partially eliminates curvature cor-rection
c) adds to the curvature correction
d) has no effect on curvature correction
Ans: b

85.   The R.L, of the point A which is on the floor is 100 m and backsight 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

86. As applied to staff readings, the correc¬tions 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

87. For a tacheometer the additive and multi-plying constants are respectively
a) 0 and 100
b) 100 and 0
c) 0 and 0
d) 100 and 100
Ans: a

88. If the focal length of the object glass is 25 cm and the distance from object glass to the trunnion axis is 15 cm, the additive constant is
a) 0.1
b) 0.4
c) 0.6
d) 1.33
Ans: b

89. The number of horizontal cross wires in a stadia diaphragm is
a) one
b) two
c) three
d) four
Ans: c

90. In Question no. 89, the number of stations is "95.
a) 2
b) 5
c) 6
d) 7
Ans: d
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