Soil Mechanics and Foundation Sheet 12

1) Question.

The ratio of the liquid limit minus the natural content of a soil to its plasticity index, is known as
Answer.
- 1
  
  toughness index
- 2
  
  liquidity index
- 3
  
  flow index
- 4
  
  relative consistency
Answer: 4

Explanation:
2) Question.

The liquidity index (in percentage) is given by
Answer.
- 1
  
  $\frac{w_{P} - w}{l_{P}}$
- 2
  
  $\frac{w_{L} - w}{l_{P}}$
- 3
  
  $\frac{w_{L} - w_{P}}{l_{P}}$
- 4
  
  $\frac{w - w_{P}}{l_{P}}$
Answer: 4

Explanation:
3) Question.

The consistency index is also known as relative consistency.
Answer.
- 1
  
  True
- 2
  
  False
Answer: 1

Explanation:
4) Question.

The consistency index is given by

[where $w_{P}$ = Plastic limit, $l_{P}$ = Plasticity index, $w_{L}$ = Liquid limit, and w= Natural water content of a soil]
Answer.
- 1
  
  $\frac{w_{P} - w}{l_{P}}$
- 2
  
  $\frac{w_{L} - w}{l_{P}}$
- 3
  
  $\frac{w_{L} - w_{P}}{l_{P}}$
- 4
  
  $\frac{w - w_{P}}{l_{P}}$
Answer: 2

Explanation:
5) Question.

A soil is in a semi- solid state, if the consistency index is
Answer.
- 1
  
  zero
- 2
  
  one
- 3
  
  more than unity
- 4
  
  none of these
Answer: 3

Explanation:
6) Question.

When the consistency index is zero, then the soil is at its
Answer.
- 1
  
  elastic limit
- 2
  
  plastic limit
- 3
  
  liquid limit
- 4
  
  semi-solid state
Answer: 3

Explanation:
7) Question.

Toughness index is the ratio of
Answer.
- 1
  
  flow index and plasticity index
- 2
  
  plasticity index and flow index
- 3
  
  liquidity index and flow index
- 4
  
  flow index and liquidity index
Answer: 2

Explanation:
8) Question.

A soil with consistency equal to one is at its ..... limit.
Answer.
- 1
  
  liquid
- 2
  
  plastic
Answer: 2

Explanation:
9) Question.

A sample of soil has liquid limit 45%, plastic limit 25%, shrinkage limit 17% and natural moisture content 30%. The consistency index of the soil is
Answer.
- 1
  
  15/20
- 2
  
  13/20
- 3
  
  8/20
- 4
  
  5/20
Answer: 1

Explanation:
10) Question.

The shear strength of a soil in the plastic limit is ....... than that in the liquid limit.
Answer.
- 1
  
  higher
- 2
  
  lower
Answer: 1

Explanation:
11) Question.

The time 't' required for attaining a certain degree of consolidation of a clay layer is proportional to
Answer.
- 1
  
  $H^{2} a n d C_{v}$
- 2
  
  $H^{2} a n d 1 / C_{v}$
- 3
  
  $1 / H^{2} a n d C_{v}$
- 4
  
  $1 / H^{2} a n d 1 / C_{v}$
Answer: 2

Explanation:
12) Question.
A completely saturated normally consolidated clay is tested in a triaxial test under consolidated undrained condition. The value of pore pressure coefficient at failure, Af is fiven by
(∆σ3=change in cell pressure;∆σ1=change
Answer.

1
$A_{f} = [\frac{∆ u - ∆ σ_{1}}{∆ u - ∆ σ_{3}}]$

2

$A_{f} = [\frac{∆ u - ∆ σ_{1}}{∆ σ_{1} - ∆ σ_{3}}]$

3

$A_{f} = [\frac{∆ u - ∆ σ_{3}}{∆ u - ∆ σ_{1}}]$

4

$A_{f} = [\frac{∆ u - ∆ σ_{3}}{∆ σ_{1} - ∆ σ_{3}}]$

Answer: 4

Explanation:

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13) Question.

Deflection of a sheet pile in a braced cut
Answer.
- 1
  
  increases from top to bottom
- 2
  
  decreases from top to bottom
- 3
  
  increases from top and then decreases
- 4
  
  decreases from top and then increases
Answer: 1

Explanation:
14) Question.

A cantilever sheet pile derives its stability from
Answer.
- 1
  
  lateral resistance of soil
- 2
  
  self-weight
- 3
  
  the deadman
- 4
  
  the anchor rod
Answer: 1

Explanation:
15) Question.

Which one of the following parameters can be used to estimate the angle of internal friction of sandy soil?
Answer.
- 1
  
  particle size
- 2
  
  roughness of particle
- 3
  
  particle size distribution
- 4
  
  density index
Answer: 4

Explanation:
16) Question.

The foundation soil under the toe of a dam has a void ratio 'e'. The specific gravity of the soil solid is G. Factor of safety against piping is to be take as 2.5. The maximum permissible upward exit gradient is given by
Answer.
- 1
  
  $i = 2.5 [\frac{G - 1}{1 + e}]$
- 2
  
  $i = 2.5 [\frac{1 + e}{G - 1}]$
- 3
  
  $i = 0.4 [\frac{1 + e}{G - 1}]$
- 4
  
  $i = 0.4 [\frac{G - 1}{1 + e}]$
Answer: 4

Explanation:
17) Question.

A particular soil sample is subjected to test for the determination of permeability coefficient in two separate constant head permeameters, whose specifications are as under:

Permeameter Permeameter

A B

Diameter of

sample
D 2D

Length of

sample
2L L

If the tests on both the permeameters are conduced with equal head of water applied on the samples, then the ratio of amount of water discharged through the permeameters A & B during a period of one hour will be:
Answer.
- 1
  
  4.000
- 2
  
  1.000
- 3
  
  0.250
- 4
  
  0.125
Answer: 4

Explanation:
18) Question.

The difference between maximum void ratio and minimum void ratio of a sand sample is 0.30. If the relative density of this sample is 66.6% at a void ratio of 0.40, then the void ratio of this sample at its loosest state will be
Answer.
- 1
  
  0.40
- 2
  
  0.60
- 3
  
  0.70
- 4
  
  0.75
Answer: 2

Explanation:
19) Question.

Consider the following field tests:

1. Vertical pile load test

2. Cyclic pile load test

3. Lateral pile load test

4. Instrumented test pile

While estimating the load carrying capacity of a pile, the tests that can be used for separating the skin resistance from point resistance, would include
Answer.
- 1
  
  1 and 3
- 2
  
  1 and 4
- 3
  
  2 and 3
- 4
  
  2 and 4
Answer: 4

Explanation:
20) Question.

The stress distribution at a depth beneath a loaded area is determined using Newkark's influence chart which indecate in influence value of 0.005. The number of the segments covered by the loaded area in the chart is 20 and the intensity of loading on the area is $10 T / m^{2}$ . The intensity of stress distribution at that depth is
Answer.
- 1
  
  $1 T / m^{2}$
- 2
  
  $2 T / m^{2}$
- 3
  
  $5 T / m^{2}$
- 4
  
  $10 T / m^{2}$
Answer: 1

Explanation:

Question Pallet

Time Left -

	Permeameter	Permeameter
	A	B
Diameter of sample	D	2D
Length of sample	2L	L