81. The most economical lighting layout which is suitable for narrow roads is
single side lighting
82. The direct interchange ramp involves diverging to the right side and
merging from right
83. In soils having same values of plasticity index, if liquid limit is increased, then
compressibility and permeability increase and dry strength decreases
84. Which of the following tests measures the toughness of road aggregates ?
impact test
85. Los Angeles testing machine is used to conduct abrasion test
86. If in a Dorry abrasion test the loss in weight is 21 gms, then the coefficient of
hardness is 13
87. In CBR test the value of CBR is calculated at both 2.5 mm and 5.0 mm penetrations
88. If aggregate impact value is 20 to 30 percent, then it is classified as
satisfactory for road surfacing
89. The maximum allowable Los Angeles abrasion value for high quality surface
course is 30 %
90. Percentage of free carbon in bitumen is less than that in tar
91. The ductility value of bitumen for suit ability in road construction should not be
less than 50 cm
92. The maximum limit of water absorption for aggregate suitable for road construction is 0.6%
93. Which of the following represents hardest grade of bitumen ?
30/40
94. Penetration test on bitumen is used for determining its grade
95. Bitumen of grade 80/100 means its penetration value is 8 to 10 mm
96. RC-2, MC-2 and SC-2 correspond to same viscosity
97. The recommended grade of tar for grouting purpose is RT-5
98. Softening point of bitumen to be used for road construction at a place where maximum temperature is 40° C should be greater than 40°C
99. For rapid curing cutbacks, the oil used is gasoline
100. The method of design of flexible pavement as recommended by IRC is CBR method