220+ Soil Mechanics and Foundations Solved MCQs

1.

Consolidation and compressibility of soil

A. is a measure of the ability of soil to allow the water to pass through its pores
B. is a measure of the ability of soil to bear stresses without failure
C. deals with changes in volume of pores in a soil under load
D. any one of the above
Answer» C. deals with changes in volume of pores in a soil under load
2.

The minimum size of grains of silts is about

A. 0.0002 mm
B. 0.002 mm
C. 0.02 mm
D. 0.2 mm
Answer» A. 0.0002 mm
3.

Quich sand is a

A. moist sand containing small particles
B. condition which occurs in coarse sand
C. condition in which a cohesionless soil loses at its strength because of upward flow of water
D. none of the above
Answer» C. condition in which a cohesionless soil loses at its strength because of upward flow of water
4.

Submerged soils are

A. partially
B. fully
Answer» B. fully
5.

The unit bearing capacity of footing in sand

A. decreases with depth of footing
B. decreses with width of footing
C. increases with depth of footing
D. increases with width of footing
Answer» C. increases with depth of footing
6.

The specific gravity of sandy soils is

A. 1.2
B. 1.8
C. 2.2
D. 2.7
Answer» D. 2.7
7.

The active earth pressure of a soil is defined as the lateral pressure exerted by soil

A. when it is at rest
B. when the retaining wall has no movement relative to the back fill
C. when the retaining wall tends to move away from the back fill
D. when the retaining wall moves into the soil
Answer» C. when the retaining wall tends to move away from the back fill
8.

Cohesionless soils are

A. sands
B. clays
C. silts
D. silts and clays
Answer» A. sands
9.

The process of maintaining or improving the performance of a soil as a constructional material, usually by the use of admixtures, is known as

A. soil exploration
B. soil stabilisation
C. soil compaction
D. consolidation
Answer» B. soil stabilisation
10.

The permeability of a given soil is

A. directly proportional to the average grain size
B. inversely proportional to the average grain size
C. directly proportional to the square of the average grain size
D. inversely proportional to the square of the average grain size
Answer» C. directly proportional to the square of the average grain size
11.

A line showing the dry density as a function of water content for soil containing no air voids, is called

A. saturation line
B. zero air void line
C. liquid limit line
D. none of these
Answer» B. zero air void line
12.

The hydraulic gradient provided at the downstream side of a hydraulic structure such as a dam, is called

A. downstream gradient
B. tail water gradient
C. exit gradient
D. any one of these
Answer» D. any one of these
13.

The dry sand specimen is put through a triaxial test. The cell pressure is 50 kPa and the deviator stress at failure is 100 kPa. The angle of internal friction for the sand specimen is

A. 15?
B. 30?
C. 35?
D. 40?
Answer» B. 30?
14.

The lateral earth pressure exerted by the soil when the retaining wall moves into the soil, is known as

A. earth pressure at rest
B. active earth pressure
C. passive earth pressure
D. total earth pressure
Answer» C. passive earth pressure
15.

Hydrometer analysis is used to determine the density of soil suspension.

A. Agree
B. Disagree
Answer» A. Agree
16.

The uniformity co-efficient of soil is defined as the ratio of

A. D40 to D10
B. D40 to D20
C. D50 to D10
D. D60 to D10
Answer» D. D60 to D10
17.

Which of the following gives the correct decreasing order of the densities of a soil sample?

A. Saturated, submerged, wet, dry
B. Saturated, wet, submerged, dry
C. Saturated, wet, dry, submerged
D. Wet, saturated, submerged, dry
Answer» C. Saturated, wet, dry, submerged
18.

The effective stress on the soil mass

A. increases
B. decreases
Answer» B. decreases
19.

The ultimate net bearing capacity lay depends upon the value of cohesion.

A. Agree
B. Disagree
Answer» A. Agree
20.

The ratio of the unit weight of soil solids to that of water is called

A. void ratio
B. porosity
C. specific gravity
D. degree of saturation
Answer» C. specific gravity
21.

When the water table is under the base of the footing at a depth equal to half of the width of the footing, the bearing capacity of a soil is reduced to

A. one-fourth
B. one-half
C. two-third
D. three-fourth
Answer» B. one-half
22.

The net ultimate bearing capacity is the maximum net pressure intensity causing shear failure of soil.

A. True
B. False
Answer» A. True
23.

Talus' is a soil transported by glacial water.

A. Right
B. Wrong
Answer» B. Wrong
24.

The compression index of the soil

A. increases with the increase in liquid limit
B. decreases with the increase in liquid limit
C. increases with the decrease in plastic limit
D. decreases with the increase in plastic limit
Answer» A. increases with the increase in liquid limit
25.

The critical gradient of the seepage of water

A. directly proportional to void ratio
B. increases with the decrease in void ratio
C. inversely proportional to specific gravity
D. increases with the decrease in specific gravity of soil
Answer» B. increases with the decrease in void ratio
26.

The settlement of a footing in sand depends upon the

A. stress deformation characteristics of sand
B. relative density of the sand
C. width of the footing
D. all of these
Answer» D. all of these
27.

The bearing capacity of a soil

A. increases
B. decreases
C. does not change
Answer» A. increases
28.

A soil with consistency equal to one is at its

A. liquid
B. plastic
Answer» B. plastic
29.

The angle of internal friction

A. varies with the density of sand
B. depends upon the amount of interlocking
C. depends upon the particle shape and roughness
D. all of the above
Answer» D. all of the above
30.

Which of the following clay mineral gives maximum swelling?

A. Kalonite
B. Montmorillonite
C. Illite
D. all of these
Answer» B. Montmorillonite
31.

The uniformity coefficient for a uniformly graded soil is nearly unity.

A. Agree
B. Disagree
Answer» A. Agree
32.

The degree of saturation for the moist soil is about

A. 0%
B. 1 to 25%
C. 25 to 50%
D. 50 to 75%
Answer» D. 50 to 75%
33.

The submerged or buoyant unit weight of soil is equal to the

A. sum
B. difference
C. product
D. ratio
Answer» B. difference
34.

The contact pressure of flexible footing on no-choesive soils is

A. more in the centre than at the edges
B. less in the centre than at the edges
C. uniform throughout
D. none of these
Answer» A. more in the centre than at the edges
35.

The seepage pressure is independent of the coefficient of permeability.

A. Correct
B. Incorrect
Answer» A. Correct
36.

The plastic limit of a soil is defined as the

A. limit of water that makes the soil to flow
B. amount of water content which makes the soil to go into the liquid state
C. amount of water content which makes the soil to go into the solid state from the liquid state
D. minimum amount of water content which makes the soil to be rolled into 3 mm diameter threads
Answer» D. minimum amount of water content which makes the soil to be rolled into 3 mm diameter threads
37.

The decrease in voids ratio per unit increse of presure is called

A. coefficient of permeability
B. coefficient of compressibility
C. coefficient of volume compressibility
D. coefficient of curvature
Answer» B. coefficient of compressibility
38.

The maximum size of grains of silts is about

A. 0.06 mm
B. 0.2 mm
C. 0.5 mm
D. 1 mm
Answer» A. 0.06 mm
39.

Which of the following statement is wrong?

A. The neutral stress does not change the shearing resistance of the soil.
B. The decrease in effective stress is accompanied by increase in the neutral stress.
C. The neutral stress does not decrease the void ratio.
D. none of the above
Answer» D. none of the above
40.

The frictional resistance of clayey soil is

A. less than
B. more than
C. same as
Answer» A. less than
41.

The coefficient of compressibility

A. increases
B. decreases
C. does not change
Answer» B. decreases
42.

If the coefficient of passive earth pressure is 1/3, then the coefficient of active earth pressure is

A. 1?3
B. 1
C. 3?2
D. 3
Answer» C. 3?2
43.

The lateral earth pressure is

A. directly proportional to the depth of soil
B. inversely proportional to the depth of soil
C. directly proportional to the squre of the depth of soil
D. inversely proportional to the square of the depth of soil
Answer» C. directly proportional to the squre of the depth of soil
44.

The net soil pressure is obtained by multiplying the net ultimate bearing capacity of soil to the factor of safety.

A. Right
B. Wrong
Answer» B. Wrong
45.

The maximum size of the particles of clay is about

A. 0.0002 mm
B. 0.002 mm
C. 0.02 mm
D. 0.2 mm
Answer» B. 0.002 mm
46.

The angle of internal friction of round grained loose sand is about

A. 5? to 25?
B. 25? to 30?
C. 30? to 35?
D. 32? to 37?
Answer» B. 25? to 30?
47.

A soil having particles of nearly the same size is known as

A. uniform soil
B. poor soil
C. well graded soil
D. coarse soil
Answer» A. uniform soil
48.

The dense sands have

A. greater
B. lesser
Answer» A. greater
49.

The unconfined compressive strength of a very hard clay is

A. 10 to 25 kN/m2
B. 25 to 150 kN/m2
C. 150 to 400 kN/m2
D. Above 400 kN/m2
Answer» D. Above 400 kN/m2
50.

The sensitivity of a normal clay is about

A. 2 to 4
B. 4 to 8
C. 8 to 15
D. 15 to 20
Answer» A. 2 to 4
51.

The flow net in the seepage of water through a soil medium is a network of

A. flow lines
B. equi-potential lines
C. flow lines and equi-potential lines
D. water particles and their movement in the soil
Answer» C. flow lines and equi-potential lines
52.

The unit of coefficient of compressibility is inverse of pressure.

A. Correct
B. Incorrect
Answer» A. Correct
53.

In the design of footings on sand, if the angle of internal friction is equal to 36?, the bearing capacity factors for

A. general
B. local
Answer» A. general
54.

The coefficient of consolidation is used for evaluating

A. stress in the soil
B. total settlement
C. over consolidation ratio
D. time rate of settlement
Answer» D. time rate of settlement
55.

The shear strength of a soil in the plastic limit is

A. higher
B. lower
Answer» A. higher
56.

A sand with greater relative density exhibits

A. smaller
B. larger
Answer» B. larger
57.

Which of the following have an influence on the value of permeability?

A. Grain size
B. Void ratio
C. Degree of saturation
D. all of these
Answer» D. all of these
58.

The angle of shearing resistance for dry loose sand is same as that of angle of internal friction.

A. Right
B. Wrong
Answer» A. Right
59.

The ratio of the difference between the void ratio in its loosest state and its natural void ratio to the difference between the voids ratio is the loosest and the densest state, is called

A. density index
B. relative density
C. degree of density
D. any one of these
Answer» D. any one of these
60.

Stoke's law is applicable to particles upto

A. 0.0002 mm
B. 0.002 mm
C. 0.02 mm
D. 0.2 mm
Answer» A. 0.0002 mm
61.

The degree of consolidation is proportional directly

A. to time and inversely to drainage path
B. to drainage path and inversely to time
C. to time and inversely to the square of drainage path
D. to square of drainage path and inversely to time
Answer» C. to time and inversely to the square of drainage path
62.

Flow lines and equi-potential lines are

A. perpendicular to each other
B. parallel to each other
C. intersecting lines at 90? to each other
D. intersecting lines at 45? to each other
Answer» C. intersecting lines at 90? to each other
63.

The effective size of a soil is

A. D10
B. D20
C. D40
D. D60
Answer» A. D10
64.

When the particles of soil are oriented 'edge to edge' or 'edge to face' with respect to one another, the soil is said to have

A. single grained structure
B. double grained structure
C. honey-combed structure
D. flocculent structure
Answer» D. flocculent structure
65.

The maximum permissible exit gradient is the critical gradient divided by a factor of safety.

A. True
B. False
Answer» A. True
66.

The ultimate settlement of a soil

A. is directly proportional to the compression index
B. decreases with an increase in the initial void ratio
C. is directly proportional to the depth of the compressible soil mass
D. all of the above
Answer» D. all of the above
67.

The effect of cohesion on a soil is to

A. reduce both active and passive earth pressure intensities
B. increase both active and passive earth pressure intensities
C. reduce active earth pressure intensity but to increase passive earth pressure intensity
D. increase active earth pressure intensity but to reduce passive earth pressure intensity
Answer» C. reduce active earth pressure intensity but to increase passive earth pressure intensity
68.

A soil sample is having a specific gravity of 2.60 and a void ratio of 0.78. The water content in percentage required to fully saturate the soil at that void ratio will be

A. 10
B. 30
C. 50
D. 70
Answer» B. 30
69.

The difference between maximum void ratio and minimum void ratio of a sand sample is 0.30. If the relative density of this sample is 66.6% at a void ratio of 0.40, then the void ratio of this sample at its loosest state will be

A. 0.4
B. 0.6
C. 0.7
D. 0.75
Answer» B. 0.6
70.

If the direction of flow of water is parallel to the planes of stratification, then the permeability is

A. 2 to 10
B. 2 to 15
C. 2 to 20
D. 2 to 30
Answer» D. 2 to 30
71.

Chemical weathering of soil is caused due to

A. oxidation
B. hydration
C. carbonation and leaching
D. all of these
Answer» D. all of these
72.

Bulk density of a soil is defined as the ratio of

A. total mass of soil to the total volume of soil
B. weight of water to the weight of solids
C. unit weight of solids to the unit weight of water
D. weight of solid grains to the volume of solids
Answer» A. total mass of soil to the total volume of soil
73.

The coefficient of consolidation of a soil is affected by

A. compressibility
B. permeability
C. both (a) and (b)
D. none of these
Answer» C. both (a) and (b)
74.

When water content in a soil is reduced beyond the shrinkage limit, the soil will be in a

A. solid state
B. liquid state
C. semi-solid state
D. plastic state
Answer» A. solid state
75.

The critical gradient for all soils is normally

A. 0.5
B. 1
C. 1.5
D. 2.5
Answer» B. 1
76.

For a sandy soil, the angle of internal friction is 30?. If the major principal stress is 50 kN/m2 at failure, the corresponding minor principal stress will be

A. 12.2 kN/m2
B. 16.66 kN/m2
C. 20.8 kN/m2
D. 27.2 kN/m2
Answer» B. 16.66 kN/m2
77.

The clays which exhibit high activity

A. contain montmorillonite
B. have high plasticity index
C. both (a) and (b)
D. none of these
Answer» C. both (a) and (b)
78.

The coefficient of volume compressibility is

A. directly proportional to the void ratio
B. inversely proportional to the void ratio
C. directly proportional to the coefficient of compressibility
D. inversely proportional to the coefficient of compressibility
Answer» C. directly proportional to the coefficient of compressibility
79.

The earth pressure at rest is calculated by using

A. Euler's theory
B. Rankine's theory
C. bending theory
D. theory of elasticity
Answer» D. theory of elasticity
80.

For a perfectly dry soil mass, the degree of saturation is zero

A. Yes
B. No
Answer» A. Yes
81.

A civil engineer is concerned mainly with

A. 2 to 5 m
B. 5 to 8 m
C. 8 to 10 m
D. 10 to 15 m
Answer» D. 10 to 15 m
82.

The effective stress on the soil is due to the

A. external load acting on the soil
B. weight of the soil particles
C. weight of water present in soil pores
D. both (a) and (b)
Answer» D. both (a) and (b)
83.

The moist soil is

A. fully
B. partially
Answer» B. partially
84.

The maximum water content of a saturated soil at which a reduction in its moisture does not cause a decrease in volume of the soil, is called

A. liquid limit
B. plastic limit
C. elastic limit
D. shrinkage limit
Answer» D. shrinkage limit
85.

When the water table is close to the ground surface, the bearing capacity of a soil is reduced to

A. one-fourth
B. one-half
C. two-third
D. three-fourth
Answer» D. three-fourth
86.

The change in volume of soil per unit of initial volume due to a given unit increase in pressure is called

A. coefficient of permeability
B. coefficient of compressibility
C. coefficient of volume compressibility
D. coefficient of curvature
Answer» C. coefficient of volume compressibility
87.

The coefficient of passive earth pressure

A. increases
B. decreases
C. does not change
Answer» A. increases
88.

The neutral stress is

A. transmitted through the points of contact of the interconnected particles of soil.
B. transmitted to the soil base through the pore water
C. independent of the depth of water above the soil mass
D. due to weight of soil particles
Answer» B. transmitted to the soil base through the pore water
89.

If the pores of a soil are completely full of air only, the soil is said to be

A. wet soil
B. dry soil
C. fully saturated soil
D. partially saturated soil
Answer» B. dry soil
90.

The soil transported by wind is called

A. aeolian soil
B. marine soil
C. alluvial soil
D. lacustrine soil
Answer» A. aeolian soil
91.

The earth pressure at rest is defined as the lateral pressure exerted by soil

A. when it is at rest
B. when the retaining wall has no movement relative to the back fill
C. when the retaining wall tends to move away from the back fill
D. when the retaining wall moves into the soil
Answer» B. when the retaining wall has no movement relative to the back fill
92.

The effective stress is also called pore-water pressure.

A. Agree
B. Disagree
Answer» B. Disagree
93.

The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30?, is

A. 1?2
B. 1?3
C. 1
D. 3
Answer» B. 1?3
94.

The rate of expulsion of pore fluid is directly dependent on the

A. shear strength
B. Void ratio
C. permeability
Answer» C. permeability
95.

Sand is almost non-compressible.

A. Correct
B. Incorrect
Answer» A. Correct
96.

The vertical deformation of soil mass consists of

A. deformation of soil grains
B. compression of pore fluid
C. reduction of pore space
D. all of these
Answer» D. all of these
97.

When the plastic limit is equal to or greater than the liquid limit, then the plasticity index is

A. negative
B. zero
C. one
D. more than one
Answer» B. zero
98.

When the consistency index is zero, then the soil is at its

A. elastic limit
B. plastic limit
C. liquid limit
D. semi-solid state
Answer» C. liquid limit
99.

The effective stress is

A. increases
B. decreases
Answer» A. increases
100.

The frictional resistance offered by sand is

A. sliding friction
B. rolling friction
C. resistance due to interlocking
D. all of these
Answer» D. all of these
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