Soil Mechanics and Foundation Engineering Quiz | Soil Mechanics and Foundation Engineering MCQs and Answers
Questions
81
The effect of cohesion on a soil is to
Answer: reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
82
The major principal stress in an element of cohesionless soil within the backfill of a retaining wall is
Answer: vertical if the soil is in an active state of plastic equilibrium
⭐ Make GKSeries Your Preferred Source on Google
Add GKSeries as Preferred Source
83
The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is
Answer: 1/3
84
Rankine’s theory of earth pressure assumes that the back of the wall is
Answer: vertical and smooth
85
Sensitivity of a soil can be defined as
Answer: ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
86
During the first stage of triaxial test when the cell pressure is increased from 0.10 N/mm2 to 0.26 N/mm2, the pore water pressure increases from 0.07 N/mm2 to 0.15 “N/mm2. Skempton’s pore pressure parameter B is
Answer: 0.5
87
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as
Answer: consolidated undrained test
88
In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on
Answer: all planes except horizontal and vertical planes
89
If the shearing stress is zero on two planes, then the angle between the two planes is
Answer: 90°
90
Select the incorrect statement.
Answer: Unconfined compression test can be carried out on all types of soils.
91
If a cohesive soil specimen is subjected to a vertical compressive load, the inclination of the cracks to the horizontal is
Answer: 45°
92
The angle that Coulomb’s failure envelope makes with the horizontal is called
Answer: cohesion
93
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
Answer: 0.05 N/mm2 and 0°
95
Select the incorrect statement.
Effective angle of shearing resistance
Answer: is limited to a maximum value of 45°
96
In a deposit of normally consolidated clay
Answer: effective stress and undrained strength increase with depth but water content decreases with depth
97
Shear strength of a soil is a unique function of
Answer: effective stress only
99
In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear
Answer: decreases
100
The shear strength of a soil
Answer: decreases with decrease in normal stress
