Soil Mechanics and Foundation Sheet 22

1) Question.

The coefficient of earth pressure at rest is given by

[ $μ$ = Poisson's ratio]
Answer.
- 1
  
  $\frac{μ}{1 + μ}$
- 2
  
  $\frac{1 + μ}{μ}$
- 3
  
  $\frac{μ}{1 - μ}$
- 4
  
  $\frac{1 - μ}{μ}$
Answer: 3

Explanation:
2) Question.

The earth pressure at rest is calculated by using
Answer.
- 1
  
  Euler's theory
- 2
  
  Rankine's theory
- 3
  
  bending theory
- 4
  
  theory of elasticity
Answer: 4

Explanation:
3) Question.

The lateral earth pressure exerted by the soil when the retaining wall moves into the soil, is known as
Answer.
- 1
  
  earth pressure at rest
- 2
  
  active earth pressure
- 3
  
  passive earth pressure
- 4
  
  total earth pressure
Answer: 3

Explanation:
4) Question.

The effect of cohesion on a soil is to
Answer.
- 1
  
  reduce both active and passive earth pressure intensities
- 2
  
  increase both active and passive earth pressure intensities
- 3
  
  reduce active earth pressure intensity but to increase passive earth pressure intensity
- 4
  
  increase active earth pressure intensity but to reduce passive earth pressure intensity
Answer: 3

Explanation:
5) Question.

The active earth pressure of a soil is defined as the lateral pressure exerted by soil
Answer.
- 1
  
  when it is at rest
- 2
  
  when the retaining wall has no movement relative to the back fill
- 3
  
  when the retaining wall tends to move away from the back fill
- 4
  
  when the retaining wall moves into the soil
Answer: 3

Explanation:
6) Question.

The earth pressure at rest is defined as the lateral pressure exerted by soil
Answer.
- 1
  
  when it is at rest
- 2
  
  when the retaining wall has no movement relative to the back fill
- 3
  
  when the retaining wall tends to move away from the back fill
- 4
  
  when the retaining wall moves into the soil
Answer: 2

Explanation:
7) Question.

A line showing the dry density as a function of water content for soil containing no air voids, is called
Answer.
- 1
  
  saturation line
- 2
  
  zero air void line
- 3
  
  liquid limit line
- 4
  
  none of these
Answer: 1

Explanation:
8) Question.

The useful method of finding the shear strength of very plastic cohesive soils is by means of
Answer.
- 1
  
  cone test
- 2
  
  penetration test
- 3
  
  vane shear test
- 4
  
  torsional shear test
Answer: 3

Explanation:
9) Question.

The frictional resistance offered by sand is
Answer.
- 1
  
  sliding friction
- 2
  
  rolling friction
- 3
  
  resistance due to interlocking
- 4
  
  all of these
Answer: 4

Explanation:
10) Question.

The frictional resistance of clayey soil is....... sandy soil.
Answer.
- 1
  
  less than
- 2
  
  more than
- 3
  
  same as
Answer: 1

Explanation:
11) Question.

A vane 20cm long and 10 cm in diameter was pressed into a soft marine clay at the bottom of a bore hole. Torque was applied gradually and failure occurred at 1000 kg cm. The cohesion of the clay in $k g / c m^{2}$ is:
Answer.
- 1
  
  $\frac{1}{π} x \frac{6}{7}$
- 2
  
  $\frac{1}{π} x \frac{5}{7}$
- 3
  
  $\frac{1}{π} x \frac{4}{7}$
- 4
  
  $\frac{1}{π} x \frac{3}{7}$
Answer: 1

Explanation:
12) Question.

Consider the following statements related to triaxial test:

1. Failure occurs along pre-determined plane.

2. Intermediate and minor principal stresses are equal.

3. Volume changes can be measured.

4. Field conditions can be simulated.

Of these statements
Answer.
- 1
  
  1, 2 and 3 correct
- 2
  
  1, 2 and 4 correct
- 3
  
  1, 3 and 4 correct
- 4
  
  2, 3 and 4 correct
Answer: 4

Explanation:
13) Question.

A and B are Skempton's pore pressure parameters and $∆ σ_{1}$ and $∆ σ_{3}$ are increemental principal stresses. Skempton's pore pressure equation is given by
Answer.
- 1
  
  $∆ u = A [∆ σ_{3} + B (∆ σ_{1} - ∆ σ_{3})]$
- 2
  
  $∆ u = B [∆ σ_{3} + A (∆ σ_{1} - ∆ σ_{3})]$
- 3
  
  $∆ u = A [∆ σ_{3} + B (∆ σ_{1} + ∆ σ_{3})]$
- 4
  
  $∆ u = B [∆ σ_{3} + A (∆ σ_{1} + ∆ σ_{3})]$
Answer: 2

Explanation:
14) Question.
Using Mohr's diagram, the relation between major principal stress $σ_{1}$ and minor principal stress $σ_{3}$ , and shear parameters c and $ϕ$ is given by
σ1=σ3Nϕ+2cNϕ where Nb
Answer.

1
$\sin ϕ / (1 + \sin ϕ)$

2

$\sin ϕ / (1 - \sin ϕ)$

3

$(1 - \sin ϕ) / (1 + \sin ϕ)$

4

$(1 + \sin ϕ) / (1 - \sin ϕ)$

Answer: 4

Explanation:

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15) Question.

For a given soil sample,

$C_{c}$ = coefficient of gradation

$C_{u}$ = coefficient of uniformity

$D_{10}$ = effective size

$D_{30}$ = diameter through which 30 per cent of the total soil mass is passing.

If $C_{c}$ =1.0 and $C_{u}$ =4.0
Answer.
- 1
  
  2.00
- 2
  
  1.75
- 3
  
  1.50
- 4
  
  1.25
Answer: 1

Explanation:
16) Question.

Increasing the depth of foundation in saturated clays results in an increased ultimate bearing capacity for strip footings
Answer.
- 1
  
  because the bearing capacity factor $N_{y}$ decreases
- 2
  
  because the bearing capacity factor $N_{c}$ , increases as the depth increases
- 3
  
  the term in the bearing capacity equation $q N_{q}$ , increases with depth
- 4
  
  because the angle of internal friction decreases as the depth of foundation increases
Answer: 3

Explanation:
17) Question.

The description of 'sandy silty clay' signifies that
Answer.
- 1
  
  the soil contains unequal proportions of the three consituents, in the order sand>silt>clay
- 2
  
  the soil contains equal proportions of sand, silt and clay
- 3
  
  the soil contains unequal proportions of sand, silt and clay
- 4
  
  the soil contains unequal proportions of the three constituents such that clay>silt>sand
Answer: 4

Explanation:
18) Question.

According to IS specifications, the minimum depths of foundation in sand and clay should be respectively
Answer.
- 1
  
  600 mm and 700 mm
- 2
  
  800 mm and 900 mm
- 3
  
  1 m and 800 mm
- 4
  
  1 m and 1.2 m
Answer: 2

Explanation:
19) Question.

Contact pressure beneath a rigid footing resting on cohesive soil is
Answer.
- 1
  
  less at edges compared to middle
- 2
  
  more at edges compared to middle
- 3
  
  uniform throughout
- 4
  
  none of the above
Answer: 2

Explanation:
20) Question.

Rise of water table in cohesionless soils upto ground surface reduces the net ultimate bearing capacity approximately by
Answer.
- 1
  
  25%
- 2
  
  50%
- 3
  
  75%
- 4
  
  90%
Answer: 2

Explanation:

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