Soil Mechanics Test 2

Question 1
2 / -0.33

The natural void ratio of a saturated soil sample is 0.6 and its density index is 60 %. If void ratio in loosest state is 0.9, (Assume G = 2.7) then

A
Water content corresponding to densest state of the soil sample is 33.33%

B
Minimum void ratio of the sample is 0.6

C
Water content corresponding to densest state of the soil sample is 14.81%

D
Minimum void ratio of the sample is 0.4

Question 2
2 / -0.33

Which of the following statements are correct?
1. Stress Isobar can be prepared using Boussinesq’s stress distribution theory.
2. Equivalent point load method yields accurate results.
3. Newmark’s method relates the vertical stress with the help of influence chart.
4. Westergaard’s method helps in determination of stress distribution for layered soils.
Select the correct answer using the codes given below:

A
1, 2 and 3 only

B
1, 3 and 4 only

C
1, 2 and 4 only

D
2, 3 and 4 only

Question 3
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Consider the following statements regarding permeability of soils:
1. Permeability of coarse grained soil is inversely proportional to the specific surface at a given porosity.
2. Direct measurement of permeability of a soil specimen at any stage of loading in odometer test can be made only in fixed-ring type odometer.
3. The permeability of an aquifer increases with decrease in temperature of water moving through it.
Which of the above statements are correct?

A
1 and 2 only

B
1 and 3 only

C
2 and 3 only

D
1, 2 and 3

Question 4
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A soil mass contains 40 % gravel, 50 % sand, and 10 % silt. The soil can be classified as-

A
Silty Sandy gravel having C_u< 60

B
Silty Gravely Sand having C_u= 10

C
Silty Gravely sand having C_u> 60

D
Gravelly Silty Sand - C_u can’t be calculated

Question 5
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A cohesive soil yields a maximum dry density of 1.8 g/cc at an OMC of 16% during standard proctor test. The maximum dry density (in g/cc) to which the soil can be compacted further is ______. (Take specific gravity of soil solid (G) = 2.7)

A
1.800

B
1.830

C
1.865

D
1.885

Question 6
2 / -0.33

In an undrained triaxial test on a saturated clay, the Poisson’s ratio is

A
$\frac{σ_{3}}{σ_{1} + σ_{3}}$

B
$\frac{σ_{3}}{σ_{1} - σ_{3}}$

C
$\frac{σ_{1} - σ_{3}}{σ_{3}}$

D
$\frac{σ_{1} + σ_{3}}{σ_{3}}$

Question 7
2 / -0.33

Using Engineering News formula, the allowable load (Q_a) of a wooden pile hammered with a drop hammer (W = 30 kN), having free fall (H) 1.5 m, penetration in last blow (S) 5 mm, using empirical constant (C) as 2.5 and factor of safety as 6, will be

A
185 kN

B
250 kN

C
212 kN

D
231 kN

Question 8
2 / -0.33

A sand sample has a bulk density of 20kN/m³ and a degree of saturation of 70%. If the specific gravity of soil grains is 2.65, the value of critical hydraulic gradient for the soil will be ( Assume γ_w= 10 kN/m³)

A
1.02

B
1.05

C
1.10

D
1.15

Question 9
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A retaining wall of height 10 m retains dry sand. In initial state, the soil is loose and has a void ratio of 0.5, γ_d = 18 kN/m² and ϕ = 30°. Subsequently, the backfill is compacted to void ratio 0.3, γ_d = 20 kN/m³ and ϕ = 35°. The ratio of initial passive thrust to final passive thrust (upto 2 decimal places) is __________.

A
0.72-0.74

B
0.724-0.741

C
0.727-0.746

D
0.729-0.742

Question 10
2 / -0.33

The coefficients of permeability of a soil in horizontal and vertical directions are 3.48 and 1.5 m/day respectively. The base length of a concrete dam resting in this soil is 100 m. When the flow net is developed for this soil with 1:25 scale factor in the vertical direction, the reduced base length of the dam will be ………………. m

A
2.62-2.64

B
2.624-2.641

C
2.627-2.646

D
2.629-2.642

Question 11
2 / -0.33

A vane shear test was performed on saturated clay layer at the site and it is noted that a torque of 45 N-m was required to shear the soil. In order to remould the soil, the vane was rotated rapidly under the certain value of torque say “x”. If the sensitivity of the clay is 8, then calculate the value of “x” in N-m.
Assume diameter and length of the vane to be 70 mm and 130 mm respectively, consider two way shearing.

A
5.5-5.7

B
5.54-5.71

C
5.57-5.76

D
5.59-5.72

Question 12
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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 strip is $\frac{d^{2} H}{d X^{2}} = 0$ (Where x is the distance along the soil strip), the value of H (in m) at the middle of the strip is ___________

A
3-3

B
34-31

C
37-36

D
39-32

Submit Test

Soil Mechanics ...

Question 1

Water content corresponding to densest state of the soil sample is 33.33%

Minimum void ratio of the sample is 0.6

Water content corresponding to densest state of the soil sample is 14.81%

Minimum void ratio of the sample is 0.4

Question 2

1, 2 and 3 only

1, 3 and 4 only

1, 2 and 4 only

2, 3 and 4 only

Question 3

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3

Question 4

Silty Sandy gravel having Cu < 60

Silty Gravely Sand having Cu = 10

Silty Gravely sand having Cu > 60

Gravelly Silty Sand - Cu can’t be calculated

Question 5

1.800

1.830

1.865

1.885

Question 6

σ3σ1+σ3

σ3σ1−σ3

σ1−σ3σ3

σ1+σ3σ3

Question 7

185 kN

250 kN

212 kN

231 kN

Question 8

1.02

1.05

1.10

1.15

Question 9

0.72-0.74

0.724-0.741

0.727-0.746

0.729-0.742

Question 10

2.62-2.64

2.624-2.641

2.627-2.646

2.629-2.642

Question 11

5.5-5.7

5.54-5.71

5.57-5.76

5.59-5.72

Question 12

3-3

34-31

37-36

39-32

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Question Analysis

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Silty Sandy gravel having C_u< 60

Silty Gravely Sand having C_u= 10

Silty Gravely sand having C_u> 60

Gravelly Silty Sand - C_u can’t be calculated

$\frac{σ_{3}}{σ_{1} + σ_{3}}$

$\frac{σ_{3}}{σ_{1} - σ_{3}}$

$\frac{σ_{1} - σ_{3}}{σ_{3}}$

$\frac{σ_{1} + σ_{3}}{σ_{3}}$