Recent questions in Soil Mechanics / GO Civil

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41

GATE2016-1-44
A drained triaxial compression test on a saturated clay yielded the effective shear strength parameters as $c’=15$ kPa and $\phi’=22^{\circ}$. Consolidated Undrained triaxial test on an identical sample of this clay at a cell pressure of $200$ kPa developed a pore water pressure of $150$ kPa at failure. The deviator stress (expressed in kPa) at failure is ________

A drained triaxial compression test on a saturated clay yielded the effective shear strength parameters as $c’=15$ kPa and $\phi’=22^{\circ}$. Consolidated Undrained ...

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42

GATE2017 CE-1: 8
Group I lists the type of gain or loss of strength in soils. Group II lists the property or process responsible for the loss or gain of strength in soils. ... $P-3, \: Q-2; \: R-1, \: S-4$ $P-4, \: Q-2; \: R-1, \: S-3$

Group I lists the type of gain or loss of strength in soils. Group II lists the property or process responsible for the loss or gain of strength in soils.$\begin{array}{l...

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43

GATE2017 CE-1: 9
A soil sample is subjected to a hydrostatic pressure, $\sigma$. The Mohr circle for any point in the soil sample would be a circle of radius $\sigma$ and center at the origin a circle of radius $\sigma$ and center at a distance $\sigma$ from the origin a point at a distance $\sigma$ from the origin a circle of diameter $\sigma$ and center at the origin

A soil sample is subjected to a hydrostatic pressure, $\sigma$. The Mohr circle for any point in the soil sample would bea circle of radius $\sigma$ and center at the ori...

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44

GATE2017 CE-1: 36
The laboratory tests on a soil sample yields the following results: natural moisture content $=18 \%$, liquid limit $=60 \%$, plastic limit $=25 \%$, percentage of clay sized fraction $=25\%$. The liquidity index and activity (as per the expression proposed by Skempton) of the soil, respectively, are $-0.2$ and $1.4$ $0.2$ and $1.4$ $-1.2$ and $0.714$ $1.2$ and $0.714$

The laboratory tests on a soil sample yields the following results: natural moisture content $=18 \%$, liquid limit $=60 \%$, plastic limit $=25 \%$, percentage of clay s...

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45

GATE2017 CE-1: 50
A consolidated undrained $(\overline{CU})$ triaxial compression test is conducted on a normally consolidated clay at a confining pressure of $100$ kPa. The deviator stress at failure is $80$ kPa, and the pore-water pressure measured at failure is $50$ kPa. The effective angle of internal friction (in degrees, up to one decimal place) of the soil is __________

A consolidated undrained $(\overline{CU})$ triaxial compression test is conducted on a normally consolidated clay at a confining pressure of $100$ kPa. The deviator stres...

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46

GATE2015-2-12
If the water content of a fully saturated soil mass is $100\%$, the void ratio of the sample is: less than specific gravity of soil equal to specific gravity of soil greater than specific gravity of soil independent of specific gravity of soil

If the water content of a fully saturated soil mass is $100\%$, the void ratio of the sample is:less than specific gravity of soilequal to specific gravity of soilgreater...

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47

GATE2015-2-37
A $588 \: cm^3$ volume of moist sand weighs $1010$ gm. Its dry weight is $918$ gm and specific gravity of solids, $G$ is $2.67$. Assuming density of water as $1 \: gm/cm^3$, the void ratio is _________.

A $588 \: cm^3$ volume of moist sand weighs $1010$ gm. Its dry weight is $918$ gm and specific gravity of solids, $G$ is $2.67$. Assuming density of water as $1 \: gm/cm^...

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48

GATE2015-1-11
A fine-grained soil has $60 \%$ (by weight) slit content. The soil behaves as $\textit{semi-solid}$ when water content is between $15 \%$ and $28 \%$. The soil behaves $\textit{fluid-like}$ when the water content is more than $40 \%$. The $’\textit{Activity}\:’$ of the soil is $3.33$ $0.42$ $0.30$ $0.20$

A fine-grained soil has $60 \%$ (by weight) slit content. The soil behaves as $\textit{semi-solid}$ when water content is between $15 \%$ and $28 \%$. The soil behaves $\...

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49

GATE2015-1-13
Which of the following statements is TRUE for degree of disturbance of collected soil sample? Thinner the sampler wall, lower the degree of disturbance of collected soil sample Thicker the sampler wall, lower the degree of disturbance of collected soil ... sample are unrelated The degree of disturbance of collected soil sample is proportional to the inner diameter of the sampling tube

Which of the following statements is TRUE for degree of disturbance of collected soil sample?Thinner the sampler wall, lower the degree of disturbance of collected soil s...

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50

GATE2015-1-15
Which of the following statements is NOT correct? Loose sand exhibits contractive behavior upon shearing Dense sand when sheared under undrained condition, may lead to generation of negative pore pressure Black cotton sild exhibits expansive behavior Liquefaction is ... soil near the downstream side of dams or sheet-piles loses its shear strength due to high upward hydraulic gradient

Which of the following statements is NOT correct?Loose sand exhibits contractive behavior upon shearingDense sand when sheared under undrained condition, may lead to gene...

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51

GATE2015-1-38
An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is $5000 \: m^3$ and the target dry unit weight is $16.2 \: kN/m^3$. Three nearby sites (see figure below) have been identified from where the required soil can be transported to ... solution (Use unit weight of water $= 10 \: kN/m^3$). Site $X$ Site $Y$ Site $Z$ Any of the sites

An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is $5000 \: m^3$ and the target dry unit weight is $16.2 \: kN/m^3...

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52

GATE2015-1-39
A water tank is to be constructed on the soil deposit shown in the figure below. A circular footing of diameter $3$ m and depth of embedment $1$ ... the load dispersion pattern as $2V:1H$. The expected settlement of the tank due to primary consolidation of the clay layer is _________ mm.

A water tank is to be constructed on the soil deposit shown in the figure below. A circular footing of diameter $3$ m and depth of embedment $1$ m has been designed to su...

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53

GATE2015-1-41
A non-homogeneous soil deposit consists of a silt layer sandwiched between a fine-sand layer at top and a clay layer below. Permeability of the silt layer is $10$ times the permeability of the clay layer and one-tenth of the permeability of ... third of the thickness of the clay layer. The ratio of equivalent horizontal and equivalent vertical permeability of the deposit is _________.

A non-homogeneous soil deposit consists of a silt layer sandwiched between a fine-sand layer at top and a clay layer below. Permeability of the silt layer is $10$ times t...

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54

GATE2014-2-38
Group I enlists in-situ field tests carried out for soil exploration, while Group II provides a list of parameters for sub-soil strength characterization. Match the type of tests with the characterization parameters. ... $P-1; Q-2; R-3; S-4$ $P-2; Q-3; R-4; S-1$ $P-4; Q-1; R-2; S-3$

Group I enlists in-situ field tests carried out for soil exploration, while Group II provides a list of parameters for sub-soil strength characterization. Match the type ...

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55

GATE2014-2-37
An infinitely long slope is made up of a $c-\phi$ soil having the properties: cohesion $(c)=20$ kPa, and dry unit weight $(\gamma_d)=16 \: kN/m^3$. The angle of inclination and critical height of the slope are $40^{\circ}$ and $5$ m respectively. To maintain the limiting equilibrium, the angle of internal friction of the soil (in degrees) is _______

An infinitely long slope is made up of a $c-\phi$ soil having the properties: cohesion $(c)=20$ kPa, and dry unit weight $(\gamma_d)=16 \: kN/m^3$. The angle of inclinati...

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56

GATE2014-2-29
Water is flowing at a steady rate through a homogeneous and saturated horizontal soil strip of $10$ m length. The strip is being subjected to a constant water head $(H)$ of $5$ m at the beginning and $1$ m at the end. If the governing equation of flow in the soil ... $x$ is the distance along the soil strip), the value of $H$ (in m) at the middle of the strip is _______

Water is flowing at a steady rate through a homogeneous and saturated horizontal soil strip of $10$ m length. The strip is being subjected to a constant water head $(H)$ ...

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57

GATE2014-2-14
The clay mineral primarily governing the swelling behavior of Black Cotton soil is Halloysite Illite Kaolinite Montmorillonite

The clay mineral primarily governing the swelling behavior of Black Cotton soil isHalloysiteIlliteKaoliniteMontmorillonite

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58

GATE2014-2-13
As per Indian Standard Soil Classification System (IS: $1498 – 1970$), an expression for $\textbf{A-line}$ is $I_p=0.73(w_L-20)$ $I_p=0.70(w_L-20)$ $I_p=0.73(w_L-10)$ $I_p=0.70(w_L-10)$

As per Indian Standard Soil Classification System (IS: $1498 – 1970$), an expression for $\textbf{A-line}$ is$I_p=0.73(w_L-20)$$I_p=0.70(w_L-20)$$I_p=0.73(w_L-10)$$I_p=...

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59

GATE2014-2-15
The contact pressure for a rigid footing resting on clay at the centre and the edges are respectively maximum and zero maximum and minimum zero and maximum minimum and maximum

The contact pressure for a rigid footing resting on clay at the centre and the edges are respectivelymaximum and zeromaximum and minimumzero and maximumminimum and maximu...

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60

GATE2014-2-16
A certain soil has the following properties: $G_s=2.71$, $n=40 \%$ and $w=20 \%$. The degree of saturation of the soil (rounded off to the nearest percent) is ______

A certain soil has the following properties: $G_s=2.71$, $n=40 \%$ and $w=20 \%$. The degree of saturation of the soil (rounded off to the nearest percent) is ______

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61

GATE2014-1-39
The following data are given for the laboratory sample. $\sigma_0=175$ kPa; $e_0 =1.1$; $\sigma_0 + \Delta \sigma_0 =300$ kPa; $e=0.9$ If thickness of the clay specimen is $25$ mm, the value of coefficient of volume compressibility is ______ $\times 10^{-4} m^2/kN$

The following data are given for the laboratory sample.$\sigma_0=175$ kPa; $e_0 =1.1$; $\sigma_0 + \Delta \sigma_0 =300$ kPa; $e=0.9$If thickness of the clay specimen is...

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62

GATE2014-1-38
A given cohesionless soil has $e_{\text{max}} = 0.85$ and $e_{\text{min}} =0.50$. In the field, the soil is compacted to a mass density of $1800 \: kg/m^3$ at a water content of $8 \%$. Take the mass density of water as $1000 \: kg/m^3$ and $G_s$ as $2.7$. The relative density (in $\%$) of the soil is $56.43$ $60.25$ $62.87$ $65.71$

A given cohesionless soil has $e_{\text{max}} = 0.85$ and $e_{\text{min}} =0.50$. In the field, the soil is compacted to a mass density of $1800 \: kg/m^3$ at a water con...

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63

GATE2014-1-16
A long slope is formed in a soil with shear strength parameters$: c'=0$ and $\phi=34^{\circ}$ ... of $1.5$, assuming a potential failure surface parallel to the slope, would be $45.3$ $44.7$ $12.3$ $11.3$

A long slope is formed in a soil with shear strength parameters$: c’=0$ and $\phi=34^{\circ}$. A firm stratum lies below the slope and it is assumed that the water tabl...

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64

GATE2014-1-14
For a saturated cohesive soil, a triaxial test yields the angle of internal friction $( \phi)$ as zero. The conducted test is Consolidated Drained (CD) test Consolidated Undrained (CU) test Unconfined Compression (UC) test Unconsolidated Undrained (UU) test

For a saturated cohesive soil, a triaxial test yields the angle of internal friction $( \phi)$ as zero. The conducted test isConsolidated Drained (CD) testConsolidated Un...

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65

GATE Civil 2013 | Question: 38
Two different soil types (Soil $1$ an Soil $2$) are used as backfill behind a retaining wall as shown in the figure, where $\gamma_t$ is total unit weight, and $c’$ and $\phi’$ are effective cohesion and effective angle of shearing resistance. The resultant active earth forceper unit length (in kN/m) acting on the wall is $31.7$ $35.2$ $51.8$ $57.0$

Two different soil types (Soil $1$ an Soil $2$) are used as backfill behind a retaining wall as shown in the figure, where $\gamma_t$ is total unit weight, and $c’$ and...

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66

GATE Civil 2013 | Question: 37
The soil profile above the rock surface for a $25^{\circ}$ infinite slope is shown in the figure, where $s_u$ is the undrained shear strength an $\gamma_t$ is total unit weight. The slip will occur at a depth of $8.83$ m $9.79$ m $7.83$ m $6.53$ m

The soil profile above the rock surface for a $25^{\circ}$ infinite slope is shown in the figure, where $s_u$ is the undrained shear strength an $\gamma_t$ is total unit ...

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67

GATE Civil 2013 | Question: 36
The soil profile below a lake with water level at elevation $=0$ m and lake bottom at elevation $=-10$ m is shown in the figure, where $k$ is the permeability coefficient. A piezometer (stand pipe) installed in the sand layer shows a reading of $+10$ m elevation. Assume that the ... $2.0 \times 10^{-6}$ $1.0 \times 10^{-6}$ $0.5 \times 10^{-6}$

The soil profile below a lake with water level at elevation $=0$ m and lake bottom at elevation $=-10$ m is shown in the figure, where $k$ is the permeability coefficient...

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68

GATE Civil 2013 | Question: 14
Following statements are made on compacted soils, wherein DS stands for the soils compacted on dry side of optimum moisture content and WS stands for the soils compacted on wet side of optimum moisture content. Identify the $\textit{incorrect}$ statement. Soil structure ... shrinkage is high on DS and low on WS On access to water, swelling is high on DS and low on DS

Following statements are made on compacted soils, wherein DS stands for the soils compacted on dry side of optimum moisture content and WS stands for the soils compacted ...

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69

GATE Civil 2013 | Question: 12
In its natural condition, a soil sample has a mass of $1.980$ kg and a volume of $0.001 \: m^3$. After being completely dried in an oven, the mass of the sample is $1.800$ kg. Specific gravity G is $2.7$. Unit weight of water is $10 \: kN/m^3$. The degree of saturation of the soil is $0.65$ $0.70$ $0.54$ $0.61$

In its natural condition, a soil sample has a mass of $1.980$ kg and a volume of $0.001 \: m^3$. After being completely dried in an oven, the mass of the sample is $1.800...

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70

GATE Civil 2013 | Question: 13
The ratio $N_f/N_d$ is known as shape factor, where $N_f$ is the number of flow lines and $N_d$ is the number of equipotential drops. Flow net is always drawn with a constant $b/a$ ratio, where $b$ and $a$ are ... downstream heads are interchanged soil in the flow space is changed dimensions of the flow space are changed head difference causing the flow is changed

The ratio $N_f/N_d$ is known as shape factor, where $N_f$ is the number of flow lines and $N_d$ is the number of equipotential drops. Flow net is always drawn with a cons...

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71

GATE Civil 2012 | Question: 38
Steady state seepage is taking place through a soil element at $Q$, $2$ m below the ground surface immediately downstream of the toe of an earthen dam as shown in the sketch. The water level in a piezometer installed at $P$, $500$ mm above $Q$, is at the ground surface. ... $Q$ is $14.42$ $15.89$ $16.38$ $18.34$

Steady state seepage is taking place through a soil element at $Q$, $2$ m below the ground surface immediately downstream of the toe of an earthen dam as shown in the ske...

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72

GATE Civil 2012 | Question: 36
Two soil specimens with identical geometric dimensions were subjected to failing head permeability tests in the laboratory under identical conditions. The fall of water head was measured after an identical time interval. The ratio of initial to final water heads for the test ... water heads in the test involving the second specimen is $3.05$ $3.80$ $4.00$ $6.25$

Two soil specimens with identical geometric dimensions were subjected to failing head permeability tests in the laboratory under identical conditions. The fall of water h...

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73

GATE2018 CE-2: 43
The compression curve (void ratio $e$ vs. effective stress, $\sigma_v^{\text{'}}$ for a certain clayey soil is a straight line in a semi-logarithmic plot and it passes through the points ($e = 1.2; \: \sigma_v=50 \: kPa$) and ($e = 0.6; \sigma_v = 800 \: kPa$). The compression index (up to two decimal places) of the soil is ______

The compression curve (void ratio $e$ vs. effective stress, $\sigma_v^{\text{'}}$ for a certain clayey soil is a straight line in a semi-logarithmic plot and it passes th...

gatecse

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74

GATE2018 CE-2: 33
Three soil specimens (Soil $1$, Soil $2$ and Soil $3$), each $150$ mm long and $100$ mm diameter, are placed in series in a instant head flow set-up as shown in the figure. Suitable screens are provided at the boundaries of the specimens to keep them intact. The values of ... and $0.03$ cm/s, respectively. The value of $h$ in the set-up is $0$ mm $40$ mm $255$ mm $560$ mm

Three soil specimens (Soil $1$, Soil $2$ and Soil $3$), each $150$ mm long and $100$ mm diameter, are placed in series in a instant head flow set-up as shown in the figur...

gatecse

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75

GATE2018 CE-2: 8
A flownet below a dam consists of $24$ equipotential drops and $7$ flow channels. The difference between the upstream the upstream and downstream water levels is $6$ m. The length of the flow line adjacent to the toe of the dam at exit is $1$ m. The specific gravity and void ... dam are $2.70$ and $0.70$, respectively. The factor of safety against piping is $1.67$ $2.5$ $3.4$ $4$

A flownet below a dam consists of $24$ equipotential drops and $7$ flow channels. The difference between the upstream the upstream and downstream water levels is $6$ m. T...

gatecse

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76

GATE2018 CE-1: 46
The void ratio of a soil is $0.55$ at an effective normal stress of $140$ kPa. The compression index of the soil is $0.25$. In order to reduce the void ratio to $0.4$, an increase in the magnitude of effective normal stress (in kPa, up to one decimal place) should be ________

The void ratio of a soil is $0.55$ at an effective normal stress of $140$ kPa. The compression index of the soil is $0.25$. In order to reduce the void ratio to $0.4$, an...

gatecse

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77

GATE2018 CE-1: 45
A conventional drained triaxial compression test was conducted on a normally consolidated clay sample under an effective confining pressure of $200$ kPa. The deviator stress at failure was found to be $400$ kPa. An identical specimen of the same clay sample is ... deviator stress at failure is $150$ kPa, the pore pressure developed (in kPa, up to one decimal place) is ________

A conventional drained triaxial compression test was conducted on a normally consolidated clay sample under an effective confining pressure of $200$ kPa. The deviator str...

gatecse

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78

GATE2018 CE-1: 21
A core cutter of $130$ mm height has inner and outer diameters of $100$ mm and $106$ mm, respectively. The area ratio of the core cutter (in $\%$, up to two decimal places) is _____

A core cutter of $130$ mm height has inner and outer diameters of $100$ mm and $106$ mm, respectively. The area ratio of the core cutter (in $\%$, up to two decimal place...

gatecse

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79

GATE2018 CE-1: 20
In a shrinkage limit test, the volume and mass of a dry soil pat are found to be $50 cm^3$ and $88$ g, respectively. The specific gravity of the soil solids is $2.71$ and the density of water is $1$ g/cc. The shrinkage limit (in $\%$, up to two decimal places is _____

In a shrinkage limit test, the volume and mass of a dry soil pat are found to be $50 cm^3$ and $88$ g, respectively. The specific gravity of the soil solids is $2.71$ and...

gatecse

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