Soil Mechanics and Foundation Sheet 35

1) Question.

The initial and final void ratios of clay sample in a consolidation test are 1 and 0.5, respectively. If the initial thickness of the sample is 2.4 cm. then its final thickness will be
Answer.
- 1
  
  1.3 cm
- 2
  
  1.8 cm
- 3
  
  1.9 cm
- 4
  
  2.2 cm
Answer: 2

Explanation:
2) Question.

A dry sand specimen is put through a triaxial test. The cell pressure is 50 kPa and the deviator stress at failure is 100 kPa. The angle of internal friction for the sand specimen is
Answer.
- 1
  
  $15 °$
- 2
  
  $30 °$
- 3
  
  $37 °$
- 4
  
  $45 °$
Answer: 2

Explanation:
3) Question.

If the actual observed value of standard penetration resistance, N, is greater than 15 in a fine sand layer below water table, then the equivalent penetration resistance will be
Answer.
- 1
  
  $15 + [\frac{(N + 15)}{2}]$
- 2
  
  $15 - [\frac{(N + 15)}{2}]$
- 3
  
  $15 + [\frac{(N - 15)}{2}]$
- 4
  
  $15 + [\frac{(15 - N)}{2}]$
Answer: 3

Explanation:
4) Question.

The changes that take place during the process of consolidation of a saturated clay would include
Answer.
- 1
  
  an increase in pore water pressure and an increase in effective pressure
- 2
  
  an increase in pore water pressure and a decrease in effective pressure
- 3
  
  a decrease in pore water pressure and decrease in effective pressure
- 4
  
  a decrease in pore water pressure and an increase in effective pressure
Answer: 4

Explanation:
5) Question.
Given that for a soil deposit,
Given that for a soil deposit,Ko=earth pressure coefficient at
Answer.

1
$K_{a} / K_{p}$

2

$K_{o} / K_{a}$

3

$K_{p} / K_{a}$

4

$1 / K_{o}$

Answer: 4

Explanation:

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6) Question.

In a cohesionless soil deposit having a unit weight of $1.5 t / m^{3}$ and an angle of internal friction of $30 °$ , the active and passive lateral earth pressure intensities $(i n t / m^{2})$ at a depth of 10 m will, respectively, be
Answer.
- 1
  
  15 and 5
- 2
  
  5 and 45
- 3
  
  10 and 20
- 4
  
  20 and 10
Answer: 2

Explanation:
7) Question.

A soil has a liquid limit of 45% and lies above the A-line when plotted on a plasticity chart. The group symbol of the soil as per IS Soil Classification is
Answer.
- 1
  
  CH
- 2
  
  CI
- 3
  
  CL
- 4
  
  MI
Answer: 2

Explanation:
8) Question.

Consider the following statements in the context of aeolian soils:

1. The soil has low density and low compressibility.

2. The soil is deposited by wind.

3. The soil has large permeability.

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

Explanation:
9) Question.

A rectangular footing 1 m x 2 m is placed at a depth 2 m in a saturated clay behaving an unconfined compressive strength of $100 k N / m^{2}$ . Accoridng to Skempton, the net ultimate bearing capacity is
Answer.
- 1
  
  $420 k N / m^{2}$
- 2
  
  $412.5 k N / m^{2}$
- 3
  
  $385 k N / m^{2}$
- 4
  
  $350 k N / m^{2}$
Answer: 3

Explanation:
10) Question.

A clay layer 5 m thich in field takes 300 days to attain 50% consolidation with condition of double drainage. If the same clay layer is underlain by hard rock then the time taken to attain 50% consolidation will be
Answer.
- 1
  
  300 days
- 2
  
  600 days
- 3
  
  900 days
- 4
  
  1200 days
Answer: 4

Explanation:

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