91. 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
Ans:c
92. Unconfmed compressive strength test is
a) undrained test
b) drained test
c) consolidated undrained test
d) consolidated drained test
Ans:a
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°
Ans:b
94. 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
Ans:a
95. 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°
Ans:b
96. 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 com-pression 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.
Ans:d
97. 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°
Ans:b
98. 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
Ans:d
99. 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
Ans:b
100. 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
Ans:a
101. 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
Ans:b
102. 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
Ans:c
103. 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
Ans:a
104. 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
Ans:a
105. 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 [GATE 99]
Ans:c
106. A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of
a) 7°
b) 10°
c) 12°
d) 17°
Ans:c
107. Coefficient of earth pressure at rest is
a) less than active earth pressure but greater than passive earth pressure
b) greater than active earth pressure but less than passive earth pressure
c) greater than both the active earth pressure and passive earth pressure
d) less than both the active and passive earth pressures
Ans:b
108. Bishop's method of stability analysis
a) is more conservative
b) neglects the effect of forces acting on the sides of the slices
c) assumes the slip surface as an arc of a circle
d) all of the above
Ans:c
109. Allowable bearing pressure for a founda¬tion depends upon
a) allowable settlement only
b) ultimate bearing capacity of soil only
c) both allowable settlement and ultimate bearing capacity
d) none of above
Ans:c
110. The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing
a) cohesion and effective angle of shearing resistance
b) cohesion and effective unit weight of soil
c) effective unit weight of soil and effective angle of shearing resistance
d) effective angle of shearing resistance
Ans:b
111. Terzaghi's general bearing capacity formula for a strip footing
(C Nc + y D Nq + 0.5 Y NTB) gives
a) safe bearing capacity
b) net safe bearing capacity
c) ultimate bearing capacity
d) net ultimate bearing capacity where C = unit cohesion
Y =unit weight of soil D = depth of foundation B = width of foundation N„ Nq, NY = bearing capacity factors
Ans:c
112. Terzaghi's bearing capacity factors Nc, Nq and Nr are functions of
a) cohesion only
b) angle of internal friction only
c) both cohesion and angle of internal friction
d) none of the above
Ans:b
113. In the plate loading test for determining the bearing capacity of soil, the size of square bearing plate should be
a) less than 300 mm
b) between 300 mm and 750 mm
c) between 750 mm and 1 m
d) greater than 1 m
Ans:b
114. Select the incorrect statement.
a) Bearing capacity of a soil depends upon the amount and direction of load.
b) Bearing capacity of a soil depends on the type of soil.
c) Bearing capacity of a soil depends upon shape and size of footing.
d) Bearing capacity of a soil is indepen-dent of rate of loading.
Ans:a
115. A 600 mm square bearing plate settles by 15 mm in plate load test on a cohesionless soil under an intensity of loading of 0.2 N/ram2. The settlement of a prototype shallow footing 1 m square under the same intensity of loading is
a) 15 mm
b) between 15 mm and 25 mm
c) 25 mm
d) greater than 25 mm
Ans:b
116. A 300 mm square bearing plate settles by 15 mm in a plate load test on a cohesive soil when the intensity of loading is 0.2 N/mm2. The settlement of a prototype shallow footing 1 m square under the same intensity of loading is
a) 15 mm
b) 30 mm
c) 50 mm
d) 167 mm
Ans:c
117. Rise of water table in cohesionless soils upto ground surface reduces the net ultimate bearing capacity approximately by
a) 25%
b) 50%
c) 75%
d) 90%
Ans:b
118. Contact pressure beneath a rigid footing resting on cohesive soil is
a) less at edges compared to middle
b) more at edges compared to middle
c) uniform throughout
d) none of the above
Ans:b
119. According to IS specifications, the minimum depths of foundation in sand and clay should be respectively
a) 600 mm and 700 mm
b) 800 mm and 900 mm
c) 1 m and 800 mm
d) 1 m and 1.2 m
Ans:b
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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
Ans:c
92. Unconfmed compressive strength test is
a) undrained test
b) drained test
c) consolidated undrained test
d) consolidated drained test
Ans:a
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°
Ans:b
94. 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
Ans:a
95. 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°
Ans:b
96. 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 com-pression 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.
Ans:d
97. 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°
Ans:b
98. 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
Ans:d
99. 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
Ans:b
100. 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
Ans:a
101. 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
Ans:b
102. 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
Ans:c
103. 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
Ans:a
104. 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
Ans:a
105. 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 [GATE 99]
Ans:c
106. A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of
a) 7°
b) 10°
c) 12°
d) 17°
Ans:c
107. Coefficient of earth pressure at rest is
a) less than active earth pressure but greater than passive earth pressure
b) greater than active earth pressure but less than passive earth pressure
c) greater than both the active earth pressure and passive earth pressure
d) less than both the active and passive earth pressures
Ans:b
108. Bishop's method of stability analysis
a) is more conservative
b) neglects the effect of forces acting on the sides of the slices
c) assumes the slip surface as an arc of a circle
d) all of the above
Ans:c
109. Allowable bearing pressure for a founda¬tion depends upon
a) allowable settlement only
b) ultimate bearing capacity of soil only
c) both allowable settlement and ultimate bearing capacity
d) none of above
Ans:c
110. The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing
a) cohesion and effective angle of shearing resistance
b) cohesion and effective unit weight of soil
c) effective unit weight of soil and effective angle of shearing resistance
d) effective angle of shearing resistance
Ans:b
111. Terzaghi's general bearing capacity formula for a strip footing
(C Nc + y D Nq + 0.5 Y NTB) gives
a) safe bearing capacity
b) net safe bearing capacity
c) ultimate bearing capacity
d) net ultimate bearing capacity where C = unit cohesion
Y =unit weight of soil D = depth of foundation B = width of foundation N„ Nq, NY = bearing capacity factors
Ans:c
112. Terzaghi's bearing capacity factors Nc, Nq and Nr are functions of
a) cohesion only
b) angle of internal friction only
c) both cohesion and angle of internal friction
d) none of the above
Ans:b
113. In the plate loading test for determining the bearing capacity of soil, the size of square bearing plate should be
a) less than 300 mm
b) between 300 mm and 750 mm
c) between 750 mm and 1 m
d) greater than 1 m
Ans:b
114. Select the incorrect statement.
a) Bearing capacity of a soil depends upon the amount and direction of load.
b) Bearing capacity of a soil depends on the type of soil.
c) Bearing capacity of a soil depends upon shape and size of footing.
d) Bearing capacity of a soil is indepen-dent of rate of loading.
Ans:a
115. A 600 mm square bearing plate settles by 15 mm in plate load test on a cohesionless soil under an intensity of loading of 0.2 N/ram2. The settlement of a prototype shallow footing 1 m square under the same intensity of loading is
a) 15 mm
b) between 15 mm and 25 mm
c) 25 mm
d) greater than 25 mm
Ans:b
116. A 300 mm square bearing plate settles by 15 mm in a plate load test on a cohesive soil when the intensity of loading is 0.2 N/mm2. The settlement of a prototype shallow footing 1 m square under the same intensity of loading is
a) 15 mm
b) 30 mm
c) 50 mm
d) 167 mm
Ans:c
117. Rise of water table in cohesionless soils upto ground surface reduces the net ultimate bearing capacity approximately by
a) 25%
b) 50%
c) 75%
d) 90%
Ans:b
118. Contact pressure beneath a rigid footing resting on cohesive soil is
a) less at edges compared to middle
b) more at edges compared to middle
c) uniform throughout
d) none of the above
Ans:b
119. According to IS specifications, the minimum depths of foundation in sand and clay should be respectively
a) 600 mm and 700 mm
b) 800 mm and 900 mm
c) 1 m and 800 mm
d) 1 m and 1.2 m
Ans:b
Read More Soil Mechanics and Foundation Engineering Questions:
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