Which one of the following statements is true for Mohr-Coulomb envelope ?

Coulomb suggests that the relationship between shear strength and normal stress, is adequately represented by the straight line

The generalised Mohr theory suggests that, though the shear stress depends on the normal stress, the relation is not linear

Coulomb and Mohr suggest that a definite relationship exists among the principal stress and the angle of internal friction

For an ideal pure friction material, the straight line passes through the origin.

If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by

The ratio of the plasticity index to the flow limit, is known as toughness index of the soil

The fluid generally used for grouting is

natural water content plus its plastic limit to its plasticity index

liquid limit minus the natural water content to the plasticity index.

The ratio of settlement at any time 't' to the final settlement, is known as

consolidation of undisturbed soil.

The internal molecular attraction of a soil, the cohesion

is more in well compacted clays

decreases as the moisture content increases

increases as the moisture content decreases

is more in well compacted clays

The critical exist gradient of seepage water in soils, is

directly proportional to the voids ratio

inversely proportional to the specific gravity

directly proportional to the specific gravity

inversely proportional to the voids ratio

For shear strength, triaxial shear test is suitable because

it can be performed under all three drainage conditions

precise measurement of the pore pressure and volume change during the test is possible

stress distribution on the failure plane, is uniform

state of stress within the specimen during any stage of the test as well as at failure, is completely determined

If Cs is the expansion index in Q. 11.165, the empirical formula given by Terzaghi, is

e¬∞ = e + Cd log10 œÉ'/œÉ0'

Coulomb's wedge theory assumes that

back fill is dry, cohesionless, homogeneous and isotropic

slip surface is the plane which passes through the heel of the wall

sliding wedge itself acts as a rigid body and the value of earth pressure is obtained by considering the limiting equilibrium of the wedge

position and direction of the resultant earth pressure, are known

If the back fill is having a uniform surcharge of intensity q per unit area, the lateral pressure will be

q times the lateral pressure within the surface

1/q times the lateral pressure within the surface

equal to a fill of height Z equal to q/r, where r is the density of the backfill

266 + Mcqs in Soil Mechanics And Foundation Engineering in Civil Engineering Page 2 McqOptions

51.	A plane inclined at an angle φ to the horizontal at which the soil is expected to stay in the absence of any lateral support, is known as
A.	natural slope line
B.	repose line
C.	the φ line
D.	all the above.
Answer» E.

Discussion

52.	If the coefficient of the active pressure Ka is 1/3, the coefficient of passive pressure Kp, is
A.	1/3
B.	2/3
C.	1
D.	3/2
E.	3
Answer» F.

Discussion

53.	The intensity of active earth pressure at a depth of 10 metres in dry cohesionless sand with an angle of internal friction of 30° and with a weight of 1.8 t/m3, is
A.	4 t/m2
B.	5 t/m2
C.	6 t/m2
D.	7 t/m2
E.	8 t/m2
Answer» D. 7 t/m2

Discussion

54.	The earth pressure of a soil at rest, is proportional to (where φ is the angle of internal friction of the soil)
A.	tan (45° - φ)
B.	tan (45° + φ)
C.	tan2 (45° - φ)
D.	tan2 (45° + φ)
E.	none of these
Answer» F.

Discussion

55.	The passive earth pressure of a soil, is proportional to (where φ is the angle of internal friction of the soil.)
A.	tan (45° - φ)
B.	tan (45° + φ)
C.	tan2 (45° - φ
D.	tan2 (45° + φ)
Answer» E.

Discussion

56.	The active earth pressure of a soil is proportional to (where φ is the angle of friction of the soil)
A.	tan (45° - φ)
B.	tan2 (45° + φ/2)
C.	tan2 (45° - φ/2)
D.	tan (45° + φ)
Answer» D. tan (45° + φ)

Discussion

57.	If β is the surcharge angle of a backfill with an angle of internal friction φ, the coefficient of active earth pressure given by Rankine's theory, is :
A.	[A].
B.	[B].
C.	[C].
D.	none of these.
Answer» C. [C].

Discussion

58.	The coefficient ka of the active earth pressure, is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

Discussion

59.	The angle of internal friction, is least for
A.	angular-grained loose sand
B.	angular -grained dense sand
C.	round-grained loose sand
D.	round-grained loose sand
E.	clays.
Answer» F.

Discussion

60.	The area of cross-section A at failure or during any stage of Triaxial Compression Test and its initial length (L) and volume (V), are related by the equation
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

61.	Which one of the following statements is true for Mohr-Coulomb envelope ?
A.	Coulomb suggests that the relationship between shear strength and normal stress, is adequately represented by the straight line
B.	The generalised Mohr theory suggests that, though the shear stress depends on the normal stress, the relation is not linear
C.	Coulomb and Mohr suggest that a definite relationship exists among the principal stress and the angle of internal friction
D.	For an ideal pure friction material, the straight line passes through the origin.
E.	All the above.
Answer» F.

Discussion

62.	A flow line makes angles θ1 and θ2 with the normal to the interface of the soils having permeabilities k1, k2 before and after deflection. According to the law of deflection of the flow lines at the interface of the dissimilar soils
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

63.	If Nf, Nd and H are total number flow channels, total number of potential drops and total hydraulic head differences respectively, the discharge q through the complete flow is given by (where K is a constant)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

64.	Laplacian fundamental equation for a non-compressible flow in three dimensions, is
A.	[A].
B.	[B].
C.	[C].
D.	none of these.
Answer» D. none of these.

Discussion

65.	A suspended particle falls through a height H cm in water in t minutes. If the viscosity of water is η and specific gravity of the particle is G, the diameter of the particle is (where M is a constant factor)
A.	103M
B.	104M
C.	105M
D.	102M
Answer» D. 102M

Discussion

66.	Fundamental relationship between dry density (γd), specific gravity (G), water content (ω) and percentage of air voids (na) is :
A.	γd =
B.	γd =
C.	γd =
D.	γd =
Answer» B. γd =

Discussion

67.	The fundamental equation of air content (ac), degree of saturation (Sr) and void ratio (e), is
A.	ac =
B.	ac =
C.	ac =
D.	ac = 1 + e/Sr
Answer» D. ac = 1 + e/Sr

Discussion

68.	Fundamental relationship between dry density (γd), bulk density (γ) and water content (ω), is :
A.	γ =
B.	γd =
C.	ω =
D.	ω =
Answer» C. ω =

Discussion

69.	The general relationship between specific gravity (G), weight of water (γω), degree of saturation (Sr), void ratio (e) and bulk density (γ), is
A.	γ =
B.	γ =
C.	γ =
D.	γ =
Answer» C. γ =

Discussion

70.	The fundamental equation of specific gravity (G), dry density (γd), unit weight of water (γω) and void ratio (e), is
A.	e =
B.	G =
C.	γd =
D.	γω =
Answer» D. γω =

Discussion

71.	A fundamental equation of void ratio(e), specific gravity (G), water content (ω) and degree of saturation (Sr) is
A.	e =
B.	ω =
C.	G =
D.	Sr =
Answer» B. ω =

Discussion

72.	The maximum possible value nf dry density is referred to as
A.	gravitational force.
B.	dry density
C.	zero air voids
D.	saturation dry density
Answer» E.

Discussion

73.	A pycnometer is used to determine
A.	drained test
B.	all the above tests.
C.	voids ratio
D.	dry density
Answer» D. dry density

Discussion

74.	A moist soil sample of volume 60 cc. weighs 108 g and its dried weight is 86.4 g. If its absolute density is 2.52, the degree of saturation is
A.	all the above.
B.	0.54
C.	0.64
D.	0.74
Answer» E.

Discussion

75.	If the specific gravity and voids in soil sample are G and e respectively, the hydraulic gradient i, is
A.	20 tonnes
B.	10 tonnes.
Answer» B. 10 tonnes.

Discussion

76.	Under-reamed piles are generally
A.
B.	driven piles
C.	bored piles
Answer» C. bored piles

Discussion

77.	If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by
A.	The ratio of the plasticity index to the flow limit, is known as toughness index of the soil
B.	All the above.
Answer» B. All the above.

Discussion

78.	The fluid generally used for grouting is
A.	natural water content plus its plastic limit to its plasticity index
B.	liquid limit minus the natural water content to the plasticity index.
C.	cement and water mix
D.	clay suspension
Answer» E.

Discussion

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» D. neither (a) nor (6).

Discussion

80.	The property of a soil which allows it to be deformed rapidly without rupture, elastic rebound and also a volume change, is known
A.	porosity
B.	plasticity
C.	permeability
D.	ductility.
Answer» C. permeability

Discussion

81.	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.	tan2 (45¬∞ + œÜ)
B.	Resilience of soils
C.	Elasticity of soils
D.	Compressibility of soils
Answer» C. Elasticity of soils

Discussion

82.	'Talus' is the soil transported by
A.	All the above.
B.	wind
C.	water
D.	glacier
Answer» E.

Discussion

83.	The factor which affects the compaction, is
A.	ultimate bearing capacity.
B.	moisture content
C.	compacting content
D.	method of compaction
Answer» E.

Discussion

84.	Fundamental relationship between dry density (Œ≥d), specific gravity (G), water content (œâ) and percentage of air voids (na) is :
A.	Œ≥d =
B.	Œ≥d =
C.	Œ≥d =
D.	Œ≥d =
Answer» B. Œ≥d =

Discussion

85.	A saturated soil sample has water content of 40% and specific gravity of soil particles 2.7. The void ratio of the soil, is
A.	0.4
B.	0.52
C.	1.08
D.	none of these.
Answer» D. none of these.

Discussion

86.	The soil which contains finest grain particles, is
A.	coarse sand
B.	fine sand
C.	silt
D.	clay.
Answer» E.

Discussion

87.	The ratio of settlement at any time 't' to the final settlement, is known as
A.	co-efficient of consolidation
B.	degree of consolidation
C.	consolidation index
D.	consolidation of undisturbed soil.
Answer» C. consolidation index

Discussion

88.	The maximum value of effective stress in the past divided by the present value, is defined as over consolidation ratio (OCR). The O.C.R. of an over consolidated clay is
A.	1 mm
B.	less than 1
C.	1
D.	more than 1
Answer» D. more than 1

Discussion

89.	The internal molecular attraction of a soil, the cohesion
A.	none of these.
B.	decreases as the moisture content increases
C.	increases as the moisture content decreases
D.	is more in well compacted clays
Answer» D. is more in well compacted clays

Discussion

90.	The critical exist gradient of seepage water in soils, is
A.	directly proportional to the voids ratio
B.	inversely proportional to the specific gravity
C.	directly proportional to the specific gravity
D.	inversely proportional to the voids ratio
Answer» E.

Discussion

91.	For shear strength, triaxial shear test is suitable because
A.	it can be performed under all three drainage conditions
B.	precise measurement of the pore pressure and volume change during the test is possible
C.	stress distribution on the failure plane, is uniform
D.	state of stress within the specimen during any stage of the test as well as at failure, is completely determined
Answer» E.

Discussion

92.	If Cs is the expansion index in Q. 11.165, the empirical formula given by Terzaghi, is
A.	e = e0 - Cd log10 œÉ'/œÉ0'
B.	e = e0 + Cd log10 œÉ'/œÉ0'
C.	e0 = e - Cd log10 œÉ'/œÉ0'
D.	e¬∞ = e + Cd log10 œÉ'/œÉ0'
Answer» C. e0 = e - Cd log10 œÉ'/œÉ0'

Discussion

93.	The ratio of volume of air voids to the volume of total voids, is known as
A.	air content
B.	percentage air voids
C.	percentage voids
D.	porosity.
Answer» B. percentage air voids

Discussion

94.	For a base failure of a slope, depth factor
A.	Df = 1
B.	Df < 1
C.	Df > 1
D.	none of these.
Answer» D. none of these.

Discussion

95.	Maximum size of clay particles, is :
A.	0.002 mm
B.	0.04 mm
C.	0.06 mm
D.	0.08 mm
Answer» B. 0.04 mm

Discussion

96.	Coulomb's wedge theory assumes that
A.	back fill is dry, cohesionless, homogeneous and isotropic
B.	slip surface is the plane which passes through the heel of the wall
C.	sliding wedge itself acts as a rigid body and the value of earth pressure is obtained by considering the limiting equilibrium of the wedge
D.	position and direction of the resultant earth pressure, are known
Answer» E.

Discussion

97.	If the back fill is having a uniform surcharge of intensity q per unit area, the lateral pressure will be
A.	q times the lateral pressure within the surface
B.	1/q times the lateral pressure within the surface
C.	equal to a fill of height Z equal to q/r, where r is the density of the backfill
D.	none of these.
Answer» D. none of these.

Discussion

98.	Through a point in a loaded soil mass, there exists n typical planes mutually orthogonal on which the stress is wholly normal and no shear stress acts, if n is
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

99.	The triaxial apparatus is usually used for
A.	unconsolidated-undrained test
B.	consolidated-undrained test
C.	drained test
D.	all the above tests.
Answer» E.

Discussion

100.	Determination of water content of a soil sample suspected to contain gypsum is made by drying the sample for longer period at a temperature not more than
A.	60¬∞C
B.	80¬∞C
C.	100¬∞C
D.	110¬∞C
Answer» C. 100¬∞C

Discussion

Explore topic-wise MCQs in Civil Engineering.

A plane inclined at an angle φ to the horizontal at which the soil is expected to stay in the absence of any lateral support, is known as

If the coefficient of the active pressure Ka is 1/3, the coefficient of passive pressure Kp, is

The intensity of active earth pressure at a depth of 10 metres in dry cohesionless sand with an angle of internal friction of 30° and with a weight of 1.8 t/m3, is

The earth pressure of a soil at rest, is proportional to (where φ is the angle of internal friction of the soil)

The passive earth pressure of a soil, is proportional to (where φ is the angle of internal friction of the soil.)

The active earth pressure of a soil is proportional to (where φ is the angle of friction of the soil)

If β is the surcharge angle of a backfill with an angle of internal friction φ, the coefficient of active earth pressure given by Rankine's theory, is :

The coefficient ka of the active earth pressure, is given by

The angle of internal friction, is least for

The area of cross-section A at failure or during any stage of Triaxial Compression Test and its initial length (L) and volume (V), are related by the equation

Which one of the following statements is true for Mohr-Coulomb envelope ?

A flow line makes angles θ1 and θ2 with the normal to the interface of the soils having permeabilities k1, k2 before and after deflection. According to the law of deflection of the flow lines at the interface of the dissimilar soils

If Nf, Nd and H are total number flow channels, total number of potential drops and total hydraulic head differences respectively, the discharge q through the complete flow is given by (where K is a constant)

Laplacian fundamental equation for a non-compressible flow in three dimensions, is

A suspended particle falls through a height H cm in water in t minutes. If the viscosity of water is η and specific gravity of the particle is G, the diameter of the particle is (where M is a constant factor)

Fundamental relationship between dry density (γd), specific gravity (G), water content (ω) and percentage of air voids (na) is :

The fundamental equation of air content (ac), degree of saturation (Sr) and void ratio (e), is

Fundamental relationship between dry density (γd), bulk density (γ) and water content (ω), is :

The general relationship between specific gravity (G), weight of water (γω), degree of saturation (Sr), void ratio (e) and bulk density (γ), is

The fundamental equation of specific gravity (G), dry density (γd), unit weight of water (γω) and void ratio (e), is

A fundamental equation of void ratio(e), specific gravity (G), water content (ω) and degree of saturation (Sr) is

The maximum possible value nf dry density is referred to as

A pycnometer is used to determine

A moist soil sample of volume 60 cc. weighs 108 g and its dried weight is 86.4 g. If its absolute density is 2.52, the degree of saturation is

If the specific gravity and voids in soil sample are G and e respectively, the hydraulic gradient i, is

Under-reamed piles are generally

If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by

The fluid generally used for grouting is

When a cohesionless soil attains quick condition, it looses

The property of a soil which allows it to be deformed rapidly without rupture, elastic rebound and also a volume change, is known

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

'Talus' is the soil transported by

The factor which affects the compaction, is

Fundamental relationship between dry density (Œ≥d), specific gravity (G), water content (œâ) and percentage of air voids (na) is :

A saturated soil sample has water content of 40% and specific gravity of soil particles 2.7. The void ratio of the soil, is

The soil which contains finest grain particles, is

The ratio of settlement at any time 't' to the final settlement, is known as

The maximum value of effective stress in the past divided by the present value, is defined as over consolidation ratio (OCR). The O.C.R. of an over consolidated clay is

The internal molecular attraction of a soil, the cohesion

The critical exist gradient of seepage water in soils, is

For shear strength, triaxial shear test is suitable because

If Cs is the expansion index in Q. 11.165, the empirical formula given by Terzaghi, is

The ratio of volume of air voids to the volume of total voids, is known as

For a base failure of a slope, depth factor

Maximum size of clay particles, is :

Coulomb's wedge theory assumes that

If the back fill is having a uniform surcharge of intensity q per unit area, the lateral pressure will be

Through a point in a loaded soil mass, there exists n typical planes mutually orthogonal on which the stress is wholly normal and no shear stress acts, if n is

The triaxial apparatus is usually used for

Determination of water content of a soil sample suspected to contain gypsum is made by drying the sample for longer period at a temperature not more than