Soil Mechanics and Foundation Sheet 10

1) Question.

The plastic limit of a soil is defined as the
Answer.
- 1
  
  limit of water that makes the soil to flow
- 2
  
  amount of water content which makes the soil to go into the liquid state
- 3
  
  amount of water content which makes the soil to go into the solid state from the liquid state
- 4
  
  minimum amount of water content which makes the soil to be rolled into 3 mm diameter threads
Answer: 4

Explanation:
2) Question.

The water content in a soil at which just shear strength develops is called
Answer.
- 1
  
  liquid limit
- 2
  
  plastic limit
- 3
  
  elastic limit
- 4
  
  shrinkage limit
Answer: 1

Explanation:
3) Question.

When water content in a soil is reduced beyond the shrinkage limit, the soil will be in a
Answer.
- 1
  
  solid state
- 2
  
  liquid state
- 3
  
  semi-solid state
- 4
  
  plastic state
Answer: 1

Explanation:
4) Question.

The maximum water content of a saturated soil at which a reduction in its moisture does not cause a decrease in volume of the soil, is called
Answer.
- 1
  
  liquid limit
- 2
  
  plastic limit
- 3
  
  elastic limit
- 4
  
  shrinkage limit
Answer: 4

Explanation:
5) Question.

The sensitivity of a normal clay is about
Answer.
- 1
  
  2 to 4
- 2
  
  4 to 8
- 3
  
  8 to 15
- 4
  
  15 to 20
Answer: 1

Explanation:
6) Question.

The unconfined compressive strength of a hard clay is
Answer.
- 1
  
  $10 t o 25 k N / m^{2}$
- 2
  
  $25 t o 150 k N / m^{2}$
- 3
  
  $150 t o 400 k N / m^{2}$
- 4
  
  above $400 k N / m^{2}$
Answer: 4

Explanation:
7) Question.

The unconfined compressive strength of a very soft clay is
Answer.
- 1
  
  $10 t o 25 k N / m^{2}$
- 2
  
  $25 t o 150 k N / m^{2}$
- 3
  
  $150 t o 400 k N / m^{2}$
- 4
  
  above $400 k N / m^{2}$
Answer: 1

Explanation:
8) Question.

The property of a soil which enables to regain its strength lost on remoulding in a short time without change of moisture content, is called
Answer.
- 1
  
  unconfined compressive strength
- 2
  
  sensitivity
- 3
  
  thixotropy
- 4
  
  relative density
Answer: 3

Explanation:
9) Question.

The ratio of the unconfined compressive strength of undisturbed soil to the unconfined compressive strength of soil in a remoulded state, is called
Answer.
- 1
  
  sensitivity
- 2
  
  thixotropy
- 3
  
  relative density
- 4
  
  bulk density
Answer: 1

Explanation:
10) Question.

Sieve analysis is done if all particles do not pass through square opening of 0.075 mm.
Answer.
- 1
  
  Correct
- 2
  
  Incorrect
Answer: 1

Explanation:
11) Question.

When the degree of consolidation is 50%, the time factor is about
Answer.
- 1
  
  0.2
- 2
  
  0.5
- 3
  
  1.0
- 4
  
  2.0
Answer: 1

Explanation:
12) Question.

Compression index on a soil helps to determine
Answer.
- 1
  
  total time required for consolidation
- 2
  
  time required for 50 percent consolidation
- 3
  
  total settlement of clay layer
- 4
  
  pre-consolidation pressure of clay
Answer: 3

Explanation:
13) Question.

Soil pressure distribution below a rigid footing on the surface of a cohesive soil is
Answer.
- 1
  
  maximum at the centre and minimum at edges
- 2
  
  minimum at the centre and maximum at edges
- 3
  
  uniform throughout
- 4
  
  maximum at one end and minimum at the other end
Answer: 2

Explanation:
14) Question.

Undisturbed soil samples are required for conducting
Answer.
- 1
  
  hydrometer test
- 2
  
  shrinkage limit test
- 3
  
  consolidation test
- 4
  
  specific gravity test
Answer: 3

Explanation:
15) Question.

According to Skemption's formula for a surface footing of square shape, the net ultimate bearing capacity on a purely cohesive soil of cohesion c is
Answer.
- 1
  
  1.4 c
- 2
  
  6.0 c
- 3
  
  7.4 c
- 4
  
  9.0 c
Answer: 2

Explanation:
16) Question.

A square footing is to be proportioned on a cohesionless soil with an average N value of 40. The allowable bearing pressure of this footing will be governed by
Answer.
- 1
  
  general shear failure
- 2
  
  local shear failure
- 3
  
  progressive failure
- 4
  
  settlement criteria
Answer: 3

Explanation:
17) Question.

Consider the following characteristics of soil layer:

1. Poisson's ratio

2. Young's modulus

3. Finite nature of soil layer

4. Effect of water table

5. Rigidity of footing

Westergaard's analysis for pressure distribution in soils utilises
Answer.
- 1
  
  1, 3, 4 and 5
- 2
  
  2, 3, 4 and 5
- 3
  
  3, 4 and 5
- 4
  
  1 and 2
Answer: 4

Explanation:
18) Question.

Westergaard's analysis for stress distribution beneath loaded areas is applicable to
Answer.
- 1
  
  sandy soils
- 2
  
  clayey soils
- 3
  
  stratified soils
- 4
  
  silty soils
Answer: 3

Explanation:
19) Question.

In consolidation testing, curve fitting method is used to determine
Answer.
- 1
  
  compression index
- 2
  
  swelling index
- 3
  
  coefficient of consolidation
- 4
  
  time factor
Answer: 3

Explanation:
20) Question.

A cohesionless soil having an angle of shearing resistance of $ϕ$ , is standing at a slope angle of i. The factor of safety of the slope is
Answer.
- 1
  
  $\frac{\tan i}{\tan ϕ}$
- 2
  
  $\tan i - \tan ϕ$
- 3
  
  $\frac{\tan ϕ}{\tan i}$
- 4
  
  $\tan ϕ - \tan i$
Answer: 3

Explanation:

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