Soil Mechanics And Foundation Sheet 39

1) Question.

For undisturbed sampling, the area ratio for a thin-wall sampler should not normally exceed
Answer.
- 1
  
  15%
- 2
  
  25%
- 3
  
  30%
- 4
  
  35%
Answer: 1

Explanation:
2) Question.
Given:

For a demped vibrating foundation system with single degree of freedom
C = damping constant,CC= crifical demping coefficient,δ
Answer.

1
$δ^{2} = 6.2832 {[\frac{C}{C_{C}}]}^{2}$

2

$δ^{2} = 6.2832 \frac{(C / C_{C})}{{(C_{C} - C)}^{2}}$

3

$δ^{2} = 39.4784 \frac{C^{2}}{{C_{C}}^{2} - C^{2}}$

4

$δ^{2} = 39.4784 \frac{{C_{C}}^{2} - C^{2}}{C^{2}}$

Answer: 3

Explanation:

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3) Question.

Permissible settlement is relatively higher for
Answer.
- 1
  
  isolated footings on clays
- 2
  
  isolated footings on sands
- 3
  
  rafts on clays
- 4
  
  rafts on sands
Answer: 3

Explanation:
4) Question.

The gross bearing capacity of footing is $450 k N / m^{2}$ . If the footing is 1.5 m wide at a depth of 1 m in clayey soil with unit weight of $20 k N / m^{3}$ , then the net bearing capacity $(i n k N / m^{2})$ will be
Answer.
- 1
  
  400
- 2
  
  430
- 3
  
  435
- 4
  
  440
Answer: 2

Explanation:
5) Question.

The factor of Safety of an infinite slope in a sand deposit is found to be 1.732. The angle of shearing resistance of the sand is $30 °$ . The average slope of the sand deposit is given by
Answer.
- 1
  
  $\sin^{- 1} (0.333)$
- 2
  
  $\cos^{- 1} (0.252)$
- 3
  
  $\tan^{- 1} (0.333)$
- 4
  
  $c o t^{- 1} (0.621)$
Answer: 3

Explanation:
6) Question.

Given:

$μ_{1} = P o i s s o n' s r a t i o o f s o i l s a m p l e 1 μ_{2} = P o i s s o n' s r a t i o o f s o$
Answer.
- 1
  
  1.3125
- 2
  
  1.7143
- 3
  
  1.9687
- 4
  
  1.8213
Answer: 2

Explanation:
7) Question.

If a sample of dry sand tested in direct shear test gives failure shear stress $t_{f} a s 1 k g / c m^{2}$ at a normal stress $σ_{f} a s 2 k g / c m^{2}$ , then the angle of internal friction of soil is given by
Answer.
- 1
  
  $\tan^{- 1} (2)$
- 2
  
  $\tan^{- 1} (1)$
- 3
  
  $\tan^{- 1} (1 / 2)$
- 4
  
  $\tan^{- 1} (1 / 4)$
Answer: 3

Explanation:
8) Question.

for a sandy soil, the angle of internal friction is $30 °$ . If the major principal stress is $50 k N / m^{2}$ at failure, then the corresponding minor principal stress $(i n k N / m^{2})$ will be
Answer.
- 1
  
  12.2
- 2
  
  16.66
- 3
  
  20.8
- 4
  
  27.2
Answer: 2

Explanation:
9) Question.

A soil has a bulk density of $1.80 g / c m^{2}$ at a water content of 5%. If the void ratio remains constant, then its bulk density for a water content of 10% will be
Answer.
- 1
  
  $1.98 g / c m^{2}$
- 2
  
  $1.88 g / c m^{2}$
- 3
  
  $1.80 g / c m^{2}$
- 4
  
  $1.70 g / c m^{2}$
Answer: 2

Explanation:
10) Question.

Under a given load, a clay layer attains 30% degree of consolidation in 100 days. The time taken by the same clay layer to attain 60% degree of consolidation will be
Answer.
- 1
  
  1600 days
- 2
  
  800 days
- 3
  
  400 days
- 4
  
  200 days
Answer: 3

Explanation:

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Soil Mechanics and Foundation Sheet 39

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