Soil Mechanics MCQs | Soil Mechanics Short Questions and Answers

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Questions
41 Select the incorrect statement.
A Effective cohesion of a soil can never have a negative value
B Effective angle of internal friction for coarse grained soils is rarely below 30°
C Effective angle of internal friction for a soil increases as state of compact-ness increases
D Effective angle of internal friction is a complicated function of mineralogy and clay size content

Answer: Effective cohesion of a soil can never have a negative value
42 For a loose sand sample and a dense sand sample consolidated to the same effective stress
A ultimate strength is same and also peak strength is same
B ultimate strength is different but peak strength is same
C ultimate strength is same but peak strength of dense sand is greater than that of loose sand
D ultimate strength is same but peak

Answer: ultimate strength is same but peak strength of dense sand is greater than that of loose sand
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43 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
44 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
45 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°
46 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
47 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
48 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
49 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
50 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

Answer: greater than active earth pressure but less than passive earth pressure
51 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

Answer: assumes the slip surface as an arc of a circle
52 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

Answer: cohesion and effective unit weight of soil
53 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

Answer: between 300 mm and 750 mm
54 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

Answer: Bearing capacity of a soil depends upon the amount and direction of load
55 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

Answer: more at edges compared to middle
56 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
57 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°
58 The ultimate consolidation settlement of a structure resting on a soil
A decreases with the increase in the initial voids ratio
B decreases with the decrease in the plastic limit
C increases with the increase in the initial voids ratio
D increases with the decrease in the porosity of the soil

Answer: decreases with the increase in the initial voids ratio
59 Compressibility of sandy soils is
A almost equal to that of clayey soils
B much greater than that of clayey soils
C much less than that of clayey soils
D none of the above

Answer: much less than that of clayey soils
60 Which of the following methods is best suited for determination of permeability of coarse-grained soils ?
A constant head method
B falling head method
C both the above
D none of the above

Answer: constant head method

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