76. As per IRC recommendations, the average level of illumination on important roads carrying fast traffic is
a) 10 lux
b) 15 lux
c) 20 lux
d) 30 lux
Ans: d
77. The most economical lighting layout which is suitable for narrow roads is
a) single side lighting
b) staggered system
c) central lighting system
d) none of the above
Ans: a
78. The direct interchange ramp involves
a) diverging to the right side and merging from left
b) diverging to the left side and merging from right
c) diverging to the right side and merging from right
d) diverging to the left side and merging from left
Ans: c
79. In soils having same values of plasticity index, if liquid limit is increased, then
a) compressibility and permeability decrease and dry strength increases
b) compressibility, permeability and dry strength decrease
c) compressibility, permeability and dry strength increase
d) compressibility and permeability increase and dry strength decreases
Ans: d
80. Which of the following tests measures the toughness of road aggregates ?
a) crushing strength test
b) abrasion test
c) impact test
d) shape test
Ans: c
81. Los Angeles testing machine is used to conduct
a) abrasion test
b) impact test
c) attrition test
d) crushing strength test
Ans: a
82. In CBR test the value of CBR is calculated at
a) 2.5 mm penetration only
b) 5.0 mm penetration only
c) 7.5 mm penetration only
d) both 2.5mm and 5.0 mm penetrations
Ans: d
83. If aggregate impact value is 20 to 30 percent, then it is classified as
a) exceptionally strong
b) strong
c) satisfactory for road surfacing
d) unsuitable for road surfacing
Ans: c
84. The maximum allowable Los Angeles abrasion value for high quality surface course is
a) 10%
b) 20 %
c) 30%
d) 45 %
Ans: c
85. Percentage of free carbon in bitumen is
a) more than that in tar
b) less than that in tar
c) equal to that in tar
d) none of the above
Ans: b
86. The ductility value of bitumen for suitability in road construction should not be less than
a) 30 cm
b) 40 cm
c) 50 cm
d) 60 cm
Ans: c
87. The maximum limit of water absorption for aggregate suitable for road construction is
a) 0.4 %
b) 0.6%
c) 0.8 %
d) 1.0 %
Ans: b
88. Which of the following represents hardest grade of bitumen ?
a) 30/40
b) 60/70
c) 80/100
d) 100/120
Ans: a
89. Penetration test on bitumen is used for determining its
a) grade
b) viscosity
c) ductility
d) temperature susceptibility
Ans: a
90. Bitumen of grade 80/100 means
a) its penetration value is 8 mm
b) its penetration value is 10 mm
c) its penetration value is 8 to 10 mm
d) its penetration value is 8 to 10 cm
Ans: c
91. RC-2, MC-2 and SC-2 correspond to
a) same viscosity
b) viscosity in increasing order from RC-2 to SC-2
c) viscosity in decreasing order from RC-2 to SC-2
d) none of the above
Ans: a
92. The recommended grade of tar for grouting purpose is
a) RT-1
b) RT-2
c) RT.3
d) RT-5
Ans: d
93. Softening point of bitumen to be used for read construction at a place where maximum temperature is 40° C should be
a) less-than 40°C
b) greater than 40°C
c) equal to 40°C
d) none of the above
Ans: b
94. For rapid curing cutbacks, the oil used is
a) gasoline
b) kerosene oil
c) light diesel
d) heavy diesel
Ans: a
95. The method of design of flexible pavement as recommended by IRC is
a) group index method
b) CBR method
c) Westergaard method
d) Benkelman beam method
Ans: b
96. The group index for a soil, whose liquid limit is 40 percent, plasticity index is 10 percent and percentage passing 75 micron IS sieve is 35, is
a) 0
b) 3
c) 5
d) 7
Ans: a
97. Bottom most layer of pavement is known as
a) wearing course
b) base course
c) sub-base course
d) subgrade
Ans: d
98. Flexible pavement distribute the wheel load
a) directly to subgrade
b) through structural action
c) through a set of layers to the subgrade
d) none of the above
Ans: c
99. The number of repetitions, which the pavement thickness designed for a given wheel load should be able to support during the life of pavement is
a) 1000
b) 10000
c) 100000
d) 1000000
Ans: d
100. Group index method of design of flexible pavement is
a) a theoretical method
b) an empirical method based on physical properties of subgrade soil
c) an empirical method based on strength characteristics of subgrade soil
d) a semi empirical method
Ans: b