RRB JE exam Civil Engineering Soil Important MCQs – 10

101. In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear
a)
 decreases
b)
 increases
c)
 remains unchanged
d)
 first increases and then decreases
Correct Option:a

102. Skempton's pore pressure coefficient B for saturated soil is
a)
 1
b)
 zero
c)
 between 0 and 1
d)
 greater than 1 [CS 95]
Correct Option:a

103. Shear strength of a soil is a unique function of
a)
 effective stress only
b)
 total stress only
c)
 both effective stress and total stress
d)
 none of the above
Correct Option:a

104. In a deposit of normally consolidated clay
a)
 effective stress increases with depth but water content of soil and un-drained strength decrease with depth
b)
 effective stress and water content increase with depth but undrained strength decreases with depth
c)
 effective stress and undrained strength increase with depth but water content decreases with depth
d)
 effective stress, water content and undrained strength decrease with depth
Correct Option:c

105. Select the incorrect statement.
Effective angle of shearing resistance

a) increases as the size of particles increases

b)
 increases as the soil gradation im-proves
c)
 is limited to a maximum value of 45°
d)
 is rarely more than 30° for fine grained soil
Correct Option:c

106. Unconfmed compressive strength test is
a)
 undrained test
b)
 drained test
c)
 consolidated undrained test
d)
 consolidated drained test
Correct Option:a

107. A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°.
The values of cohesion and angle of internal friction for the soil are respectively

a)
 0.5 N/mm2 and 30°
b)
 0.05 N/mm2 and 0°
c)
 0.2 N/mm2 and 0°
d)
 0.05 N/mm2 and 45°
Correct Option:b

109. The angle that Coulomb's failure envelope makes with the horizontal is called
a)
 cohesion
b)
 angle of internal friction
c)
 angle of repose
d)
 none of the above
Correct Option:a

111. If a cohesive soil specimen is subjected to a vertical compressive load, the inclination of the cracks to the horizontal is
a)
 90°
b)
 45°
c)
 22.5°
d)
 
Correct Option:b