Soil Mechanics and Foundation Engineering Quiz | Soil Mechanics and Foundation Engineering MCQs and Answers

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Questions
81 The effect of cohesion on a soil is to
A reduce both the active earth pressure intensity and passive earth pressure intensity
B increase both the active earth pressure intensity and passive earth pressure intensity
C reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
D increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity

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
A vertical if the soil is in an active state of plastic equilibrium
B vertical if the soil is in a passive state of plastic equilibrium
C inclined at 45° to the vertical plane
D none of the above

Answer: vertical if the soil is in an active state of plastic equilibrium
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83 The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is
A 1/3
B 3
C 1
D 1/2

Answer: 1/3
84 Rankine’s theory of earth pressure assumes that the back of the wall is
A plane and smooth
B plane and rough
C vertical and smooth
D vertical and rough

Answer: vertical and smooth
85 Sensitivity of a soil can be defined as
A percentage of volume change of soil under saturated condition
B ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
C ratio of volume of voids to volume of solids
D none of the above

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
A 0.5
B -0.5
C 2.0
D – 2.0

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
A consolidated drained test
B consolidated undrained test
C unconsolidated drained test
D unconsolidated undrained test

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
A horizontal plane only
B vertical plane only
C both horizontal and vertical planes
D all planes except horizontal and vertical planes

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
A 45°
B 90°
C 135°
D 225°

Answer: 90°
90 Select the incorrect statement.
A In a direct shear box test, the plane of shear failure is predetermined.
B Better control is achieved on the drainage of the soil in a triaxial compression test.
C Stress distribution on the failure plane in the case of triaxial compression test is uniform.
D Unconfined compression test can be carried out on all types of soils.

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
A 90°
B 45°
C 22.5°
D 0°

Answer: 45°
92 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

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
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°

Answer: 0.05 N/mm2 and 0°
94 Unconfmed compressive strength test is
A undrained test
B drained test
C consolidated undrained test
D consolidated drained test

Answer: undrained test
95 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

Answer: is limited to a maximum value of 45°
96 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

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
A effective stress only
B total stress only
C both effective stress and total stress
D none of the above

Answer: effective stress only
98 Skempton’s pore pressure coefficient B for saturated soil is
A 1
B zero
C between 0 and 1
D greater than 1

Answer: 1
99 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

Answer: decreases
100 The shear strength of a soil
A is directly proportional to the angle of internal friction of the soil
B is inversely proportional to the angle of internal friction of the soil
C decreases with increase in normal stress
D decreases with decrease in normal stress

Answer: decreases with decrease in normal stress
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