310+ Geotechnical Engineering Solved MCQs

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1.

Rise of water table above the ground surface causes

A. Equal increase in pore water pressure and total stress
B. Equal decrease in pore water pressure and total stress
C. Increase in pore water pressure but decrease in total stress
D. Decrease in pore water pressure but increase in total
Answer» A. Equal increase in pore water pressure and total stress
2.

If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

A. The liquid limit of soil always increases
B. The liquid limit of soil always decreases
C. The liquid limit of soil may increase
D. The liquid limit of soil may decrease
Answer» A. The liquid limit of soil always increases
3.

A triaxial shear test is preferred to direct shear test, because

A. It can be performed under all three drainage conditions with complete control
B. Precise measurement of pore pressure and change in volume during test, is not possible
C. Stress distribution on the failure plane, is non uniform
D. None of these
Answer» A. It can be performed under all three drainage conditions with complete control
4.

The average coefficient of permeability of natural deposits

A. Parallel to stratification is always greater than that perpendicular to stratification
B. Parallel to stratification is always less than that perpendicular to stratification
C. Is always same in both directions
D. Parallel to stratification may or may not be greater than that perpendicular to stratification
Answer» A. Parallel to stratification is always greater than that perpendicular to stratification
5.

Pick up the correct statement from the following:

A. The dry density reduces by addition of water after attaining optimum moisture content
B. The line joining the peak of three moisture content graphs obtained by using three compactive energies, is called line of optimus
C. Well graded coarse grained soils can be compacted to a very high density as compared to fine grained soils
D. All the above
6.

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» D. Decreases with decrease in normal stress
7.

Pick up the correct statement from the following:

A. The object of classifying soils is to arrange them into groups according to their properties and behaviour
B. A soil classification system is meant to provide an accepted and systematic method of describing the various types of soils eliminating personal factors
C. The first category of soil classification is based on grain size of the soil
D. All the above
8.

The major principal stress in an element of cohesion-less 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» A. Vertical if the soil is in an active state of plastic equilibrium
9.

A grillage foundation

A. Is provided for heavily loaded isolated columns
B. Is treated as spread foundation
C. Consists of two sets of perpendicularly placed steel beams
D. All the above
10.

Effective stress on soil

A. Increases voids ratio and decreases permeability
B. Increases both voids ratio and permeability
C. Decreases both voids ratio and permeability
D. Decreases voids ratio and increases permeability
Answer» C. Decreases both voids ratio and permeability
11.

A. Temperature correction
B. Meniscus correction
C. Dispersing agent correction
D. Temperature, meniscus and dispersing agent corrections
Answer» D. Temperature, meniscus and dispersing agent corrections
12.

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» A. Decreases with the increase in the initial voids ratio
13.

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» D. Unconfined compression test can be carried out on all types of soils
14.

The angle of internal friction, is least for

A. Angular-grained loose sand
B. Angular -grained dense sand
C. Round-grained loose sand
D. Clays
15.

Dispersed type of soil structure is an arrangement comprising particles having

A. Face to face or parallel orientation
B. Edge to edge orientation
C. Edge to face orientation
D. All of the above
Answer» A. Face to face or parallel orientation
16.

The neutral stress in a soil mass is

A. Force per neutral area
B. Force per effective area
C. Stress taken up by the pore water
D. Stress taken up by solid particles
Answer» C. Stress taken up by the pore water
17.

The coefficient of compressibility of soil, is the ratio of

A. Stress to strain
B. Strain to stress
C. Stress to settlement
18.

A clay subjected to pressure in excess to its present over-burden, is said to be

A. Pre-compressed
B. Pre-consolidated
C. Over-consolidated
D. All the above
19.

Physical properties of a permeant which influence permeability are

A. Viscosity only
B. Unit weight only
C. Both viscosity and unit weight
D. None of the above
Answer» C. Both viscosity and unit weight
20.

Pick up the correct statement from the following:

A. The range of water content between the liquid limit and plastic limit is called plasticity index
B. The ratio of the liquid limit minus the natural water content to the plasticity index of soils, is called consistency index
C. The ratio of natural water content minus its plastic limit to its plasticity index is called liquidity index
D. All the above
21.

Rankine's theory of active earth pressure assumes

A. Soil mass is homogeneous, dry and cohesionless
B. Ground surface is a plane which may be horizontal or inclined
C. Back of the wall is vertical and smooth
D. All the above
22.

For testing a saturated clay for shear strength, the test recommended, is

A. Direct shear test
B. Triaxial compression test
C. Unconfined compression test
D. All the above
23.

Coefficient of permeability of soil

A. Does not depend upon temperature
B. Increases with the increase in temperature
C. Increases with the decrease in temperature
D. None of the above
Answer» B. Increases with the increase in temperature
24.

Pick up the correct statement from the following:

A. In soils, the flow index indicates variation in shear strength with water content
B. Liquid limit minus plastic limit, is known as plasticity index of the soil
C. Plastic limit minus shrinkage limit, is known as shrinkage index of the soil
D. All the above
25.

The triaxial apparatus is usually used for

A. Unconsolidated-undrained test
B. Consolidated-undrained test
C. Drained test
D. All the above tests
Answer» D. All the above tests
26.

Which one of the following clays behaves like a dense sand?

A. Over-consolidated clay with a high over-consolidation ratio
B. Over-consolidated clay with a low over-consolidation ratio
C. Normally consolidated clay
D. Under-consolidated clay
Answer» A. Over-consolidated clay with a high over-consolidation ratio
27.

During seepage through a soil, direction of seepage is always

A. Parallel to equipotential lines
B. Perpendicular to stream lines
C. Perpendicular to equipotential lines
D. None of these
Answer» C. Perpendicular to equipotential lines
28.

The seepage force in a soil, is

A. Perpendicular to the equipotential lines
B. Proportional to the exit gradient
C. Proportional to the head loss
D. All the above
29.

Pick up the correct statement from the following:

A. Coefficient of compressibility is the decrease in void ratio per unit increase of pressure
B. The percent settlement at any time is called degree of consolidation
C. Time factor is a dimensionless quantity
D. All the above
30.

A. Only in fixed ring type consolidometer
B. Only in floating ring type consolidometer
C. Both (A) and (B)
D. None of the above
Answer» A. Only in fixed ring type consolidometer
31.

A. Porosity
B. Plasticity
C. Permeability
D. Ductility
32.

Failure of the stability of slopes, generally occurs along

A. Slip plane
B. A horizontal surface
C. A curved surface
D. All the surfaces
33.

The shearing force acting along the slice of a curved surface of slippage, causes the soil to slide

A. Down at the centre
B. Down at the toe
C. Upward at the centre
D. None of these
Answer» A. Down at the centre
34.

With the increase in the amount of compaction energy

A. Optimum water content increases but maximum dry density decreases
B. Optimum water content decreases but maximum dry density increases
C. Both optimum water content and maximum dry density increase
D. Both optimum water content and maximum dry density decrease
Answer» B. Optimum water content decreases but maximum dry density increases
35.

Soils containing organic matters

A. Are of spongy nature
B. Swell with decrease of moisture
C. Shrink with increase of moisture content
D. None of these
Answer» A. Are of spongy nature
36.

Buoyant unit weight equals the saturated density

A. Multiplied by unit weight of water
B. Divided by unit weight of water
C. Plus unit weight of water
D. Minus unit weight of water
Answer» D. Minus unit weight of water
37.

The change of moisture content of soils, changes the

A. Value of the angle of repose
B. Amount of compaction required
C. Cohesive strength of soil
D. All the above
38.

Skempton's pore pressure coefficient B for saturated soil is

A. 1
B. Zero
C. Between 0 and 1
D. Greater than 1
39.

The density of soil can be increased

A. By reducing the space occupied by air
B. By elastic compression of soil grains
C. By expelling water from pores
D. All the above
40.

Pick up the correct statement from the following:

A. Kaolinite is most stable clay
B. Kaolinite shows a very little sign of swelling on wetting
C. Kaolinite is also called China clay
D. All the above
41.

Pick up the correct definition from the following:

A. The lateral pressure exerted by the soil when the retaining wall moves away from the back fill, is generally known as active earth pressure of the soil
B. The lateral pressure exerted by the soil when the retaining wail moves towards the soil, is generally known as 'Passive earth pressure of the soil
C. The lateral pressure exerted by the soil when the retaining wall has no movement relative to the back fill, is known as 'earth pressure at rest of the soil
D. All the above
42.

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
43.

A. 24.2 %
B. 18.2 %
C. 53.8 %
D. None of these
44.

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
45.

A flow net may be utilised for the determination of

B. Seepage
C. Hydrostatic pressure
D. All the above
46.

The compression index of a soil

A. Decreases with an increase in the liquid limit
B. Increases with an increase in the liquid limit
C. Decreases with an increase in the plastic limit
D. Is not related with plastic limit
Answer» B. Increases with an increase in the liquid limit
47.

A. 1/3
B. 2/3
C. 1
D. 3
48.

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» B. Ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
49.

A. 4 t/m2
B. 5 t/m2
C. 6 t/m2
D. 7 t/m2
50.

The soil moisture driven off by heat, is called

A. Free water
B. Hydroscopic water
C. Gravity water
D. None of these
51.

Plasticity index is defined as the range of water content between

A. Liquid and plastic limit
B. Plastic limit and semi solid limit
C. Semi-solid limit and liquid limit
D. Liquid limit and solid limit
Answer» A. Liquid and plastic limit
52.

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» C. Assumes the slip surface as an arc of a circle
53.

You are given a sample of soil containing coarse grains to determine its water content, you will use

A. Pycnometer
B. Oven-drying method
C. Calcium carbide method
D. Alcohol method
54.

Pick up the incorrect definition from the following:

A. Ratio of the compressive strength of unconfined undisturbed soil to that of remoulded soil, is known as the sensitivity of the soil sample
B. The rotation of soil particles into stable state while remoulding, is known as the thiostropy of soil
C. The water content at which a soil flows, is known plastic limit of the soil
D. None of these
55.

A 600 mm square bearing plate settles by 15 mm in plate load test on a cohesion-less 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
Answer» B. Between 15 mm and 25 mm
56.

The angle between the directions of the failure and the major principal plane, is equal to

A. 90° + effective angle of shearing resistance
B. 90° + half of the angle of shearing resistance
C. 45° - half of the angle of shearing resistance
D. 45° + half of the angle of shearing resistance
Answer» D. 45° + half of the angle of shearing resistance
57.

In active state of plastic equilibrium in a non cohesive soil with horizontal ground surface

A. Major principal stress is horizontal
B. Minor principal stress is vertical
C. Major principal stress is vertical
D. Minor and major principal stresses are equally inclined to horizontal
Answer» C. Major principal stress is vertical
58.

Residual soils are formed by

A. Glaciers
B. Wind
C. Water
D. None of the above
Answer» D. None of the above
59.

A soil not fully consolidated under the existing over-burden pressure, is called

A. Pre-consolidated
B. Normally consolidated
C. Over-consolidated
D. None of these
60.

Pick up the correct statement from the following:

A. Illite bond is weaker than Kaolinite bond
B. Illite bond is stronger than montmorillonite bond
C. Illite does not swell when wet
D. All the above
61.

A. Tv = d²/Cvt
B. Tv = t²/d²Cv
C. Tv = Cv3/d²t
D. Tv = Cvt/dt²
62.

Select the correct statement.

A. Unit weight of dry soil is greater than unit weight of wet soil
B. For dry soils, dry unit weight is less than total unit weight
C. Unit weight of soil increases due to submergence in water
D. Unit weight of soil decreases due to submergence in water
Answer» D. Unit weight of soil decreases due to submergence in water
63.

The bearing capacity of a soil depends upon

A. Size of the particles
B. Shape of the particles
C. Cohesive properties of particles
D. All the above
64.

Pick up the correct statement from the following:

A. The void ratio in soils is defined as the ratio of the volume of voids to the volume of solids
B. The bulk density of a soil is defined as the unit weight of the soil
C. The dry density of a soil is defined as weight of solids to the total volume of the soil
D. All the above
65.

If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is

A. Less than specific gravity of soil
B. Equal to specific gravity of soil
C. Greater than specific gravity of soil
D. Independent of specific gravity of soil
Answer» B. Equal to specific gravity of soil
66.

A. 70 %
B. 75 %
C. 80 %
D. 85 %
67.

Stoke's law is valid only if the size of particle is

A. Less than 0.0002 mm
B. Greater than 0.2 mm
C. Between 0.2 mm and 0.0002 mm
D. All of the above
Answer» C. Between 0.2 mm and 0.0002 mm
68.

Pick up the correct statement applicable to plate load test

A. Width of the test pit for plate load test is made five times the width of the plate
B. At the centre of the test pit, a hole is dug out whose size is kept equal to the size of the test plate
C. Bottom level of the hole dug at the centre of the test pit, is kept at the level of the actual formation
D. All the above
69.

Failure of a slope occurs only when total shear force is

A. Equal to total shearing strength
B. Greater than total shearing strength
C. Less than total shearing strength
D. None of these
Answer» B. Greater than total shearing strength
70.

If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in

A. Liquid state
B. Plastic state
C. Semisolid state
D. Solid state
71.

Pick up the correct statement from the following:

A. The permeability of the coarse-grained soils may be reduced by grouting
B. The process of injecting fluids (i.e. grouts) into the pores space of the soil is called grouting
C. The grouting increases the soil strength
D. All the above
72.

Negative skin friction on piles

A. Is caused due to relative settlement of the soil
B. Is caused in soft clays
C. Decreases the pile capacity
D. All of the above
Answer» D. All of the above
73.

Select the correct statement.

A. A uniform soil has more strength and stability than a nonuniform soil
B. A uniform soil has less strength and stability than a nonuniform soil
C. Uniformity coefficient does not affect strength and stability
D. Uniformity coefficient of a poorly graded soil is more than that of a well graded soil
Answer» B. A uniform soil has less strength and stability than a nonuniform soil
74.

If a soil undergoes a change in shape and volume by application of external loads over it, but recovers its shape and volume immediately after removal of the load, the property of the soil is said to be

A. Resilience of soils
B. Elasticity of soils
C. Compressibility of soils
D. None of these
75.

The water content in a soil sample when it continues to loose weight without loosing the volume, is called

A. Shrinkage limit
B. Plastic limit
C. Liquid limit
D. Semi-solid limit
76.

Effective stress is

A. The stress at particles contact
B. A physical parameter that can be measured
C. Important because it is a function of engineering properties of soil
D. All of the above
Answer» C. Important because it is a function of engineering properties of soil
77.

The angle of internal friction is maximum for

A. angular-grained loose sand
B. angular-grained dense sand
C. round-grained dense sand
D. round-grained loose sand
78.

A. 1.10
B. 1.15
C. 1.20
D. 1.30
79.

When a cohesionless soil attains quick condition, it looses

A. Shear strength
B. Bearing capacity
C. Both (a) and (b)
D. Neither (a) nor (6)
Answer» C. Both (a) and (b)
80.

Select the correct statement.

A. The greater the viscosity, the greater is permeability
B. The greater the unit weight, the greater is permeability
C. The greater the unit weight, the smaller is permeability
D. Unit weight does not affect permeability
Answer» B. The greater the unit weight, the greater is permeability
81.

A direct shear test possesses the following disadvantage:

A. A relatively thin thickness of sample permits quick drainage
B. A relatively thin thickness of sample permits quick dissipation of pore pressure developed during the test
C. As the test progresses the area under shear, gradually changes
D. None of these
Answer» C. As the test progresses the area under shear, gradually changes
82.

A. 100 years
B. 120 years
C. 140 years
D. 160 years
83.

When the seepage pressure becomes equal to the pressure due to submerged weight of a soil, the effective pressure is reduced to zero and the soil particles have a tendency to move up in the direction of flow. This phenomenon is generally known

A. Quick condition
B. Boiling condition
C. Quick sand
D. All the above
84.

If drainage is permitted throughout the test, during the application of both normal, and shear stresses so that full consolidation occurs and no excess pore pressure is set up at any stage of the test, is known as

A. Quick test
B. Drained test
C. Consolidated undrained test
D. None of these
85.

Degree of consolidation is

A. Directly proportional to time and inversely proportional to drainage path
B. Directly proportional to time and inversely proportional to square of drainage path
C. Directly proportional to drainage path and inversely proportional to time
D. Directly proportional to square of drainage path and inversely proportional to time
Answer» B. Directly proportional to time and inversely proportional to square of drainage path
86.

Terzaghi's theory of one dimensional consolidation assumes

A. Load is applied in one direction
B. Coefficient of permeability is constant
C. Excess pore water drains out only in the vertical direction
D. All the above
87.

The shear resistance of a soil is constituted basically of the following component.

A. The frictional resistance to translocation between the individual soil particles at their contact point
B. To the structural relation to displacement of the soil because of the interlocking of the particles
C. Cohesion and adhesion between the surfaces of the soil particles
D. All the above
88.

The consolidation time for soils

A. Increases with increasing compressibility
B. Decreases with increasing permeability
C. Increases rapidly with increasing size of soil mass
D. All the above
89.

Coefficient of compressibility is

A. Constant for any type of soil
B. Different for different types of soils and also different for a soil under different states of consolidation
C. Different for different types of soils but same for a soil under different states of consolidation
D. Independent of type of soil but depends on the stress history of soil
Answer» B. Different for different types of soils and also different for a soil under different states of consolidation
90.

The ratio of the weight of water to the weight of solids in a given mass of soil, is known

A. Porosity
B. Specific gravity
C. Void ratio
D. Water content
91.

A. 35 %
B. 50 %
C. 65 %
D. None of these
92.

The critical exist gradient of seepage water in soils, increases with

A. An increase in specific gravity
B. A decrease in specific gravity
C. A decrease in void ratio
D. Both (a) and (c)
Answer» D. Both (a) and (c)
93.

The Mohr's straight theory is based on the following fact:

A. Material fails essentially by shear
B. Ultimate strength of the material is determined by the stress in the plane of slip
C. Failure criterion is independent of the intermediate principal stress
D. All the above
94.

According to Coulomb's wedge theory, the active earth pressure slides the wedge

A. Down and outwards on a slip surface
B. Up and inwards on a slip surface
C. Horizontal upward and parallel to base
D. Horizontal inward and parallel to base
Answer» A. Down and outwards on a slip surface
95.

Pile foundations are generally preferred to for

A. Bridge foundations
B. Sky scrapper buildings
C. Residential buildings
D. Runways
96.

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» B. Cohesion and effective unit weight of soil
97.

A soil mass is said to be in plastic equilibrium if

A. It is stressed to maximum
B. It is on the verge of failure
C. It is in plastic stage
D. It starts flowing
Answer» B. It is on the verge of failure
98.

Stoke's law states that the velocity at which a grain settles out of suspension, the other factors remaining constant, is dependent upon

A. Shape of grain
B. Weight of grain
C. Size of grain
D. Shape, size and weight of grain
Answer» D. Shape, size and weight of grain
99.

Pick up the correct statement from the following:

A. A soil having pH value more than 7 is an acidic soil
B. A soil having pH value less than 7 is an acidic soil
C. A soil having pH value more than 7 is an alkaline soil
D. A soil containing chemicals for the manufacture of Portland cement is preferred
Answer» B. A soil having pH value less than 7 is an acidic soil
100.

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» B. More at edges compared to middle