Soil Mechanics and Foundation Sheet 38

1) Question.

A 2 m wide strip footing rests at a depth of 2 m below ground surfae in a clay deposit where water table is at ground surface, $c = 3 t / m^{3} a n d y_{s a t} = 2 t / m^{3}$ . The best estimate of the net ultimate load which the footing can carry is
Answer.
- 1
  
  18 t/m
- 2
  
  22 t/m
- 3
  
  34.2 t/m
- 4
  
  48 t/m
Answer: 1

Explanation:
2) Question.

A fully saturated clay specimen is placed in a consolidometer and subjected to a loading of $200 k N / m^{2}$ . After a period of time it was found that the average pore pressure in the specimen was $70 k N / m^{2}$ . The percentage of consolidation reached by then was
Answer.
- 1
  
  70
- 2
  
  65
- 3
  
  35
- 4
  
  29
Answer: 2

Explanation:
3) Question.

In a saturated soil deposit having a density of $22 k N / m^{3}$ , the effective normal stress on horizontal plane at 5 m depth will be
Answer.
- 1
  
  $22 k N / m^{2}$
- 2
  
  $55 k N / m^{2}$
- 3
  
  $60 k N / m^{2}$
- 4
  
  $110 k N / m^{2}$
Answer: 3

Explanation:
4) Question.

Which one of the following planes is most likely to be the failure plane in sandy soils?
Answer.
- 1
  
  Plane carrying maximum shear stress
- 2
  
  Plane carring maximum normal stress
- 3
  
  Plane with the maximum angle of obliquity
- 4
  
  Principal plane
Answer: 3

Explanation:
5) Question.

An undrained triaxial compression test is carried out on a saturated clay sample under a cell pressure of $100 k N / m^{2}$ . The sample failed at a deviator stress of $200 k N / m^{2}$ . The cohesion of the given sample of clay is
Answer.
- 1
  
  $50 k N / m^{2}$
- 2
  
  $100 k N / m^{2}$
- 3
  
  $200 k N / m^{2}$
- 4
  
  $300 k N / m^{2}$
Answer: 2

Explanation:
6) Question.

Consider the following statements about the properties of flowents:

1) Flow lines are perpendicular to equipotential lines.

2) No two flow lines or equipotential lines start from the same point.

3) No two flow lines cross each other.

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

Explanation:
7) Question.

The ratio of the energies imparted to soil sample in modified Proctor's compaction test and the standard Proctor's compaction test is about
Answer.
- 1
  
  10.0
- 2
  
  4.5
- 3
  
  2.2
- 4
  
  1.8
Answer: 2

Explanation:
8) Question.

A stratum of soil consists of three layers of equal thickness. The permeabilities of top and bottom layers are $K = 10^{- 4} c m / s$ and that of the middle layer is $K = 10^{- 3} c m / s$ . Then the value of the horizontal coefficient of permeability $K_{H}$ for the entire soil layers is
Answer.
- 1
  
  $2 x 10^{- 3} c m / s$
- 2
  
  $4 x 10^{- 4} c m / s$
- 3
  
  $3 x 10^{- 4} c m / s$
- 4
  
  $1.5 x 10^{- 4} c m / s$
Answer: 2

Explanation:
9) Question.

A sample of soil has the following properties:

Liquid limit = 45%

Plastic limit = 25%

Shrinkage limit = 17%

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.

Which of the following pairs are correctly matched?

1. Standard penetration test ..... Relative density

2. Vane shear .... Cohesion

3. Consolidation test .... Bearing capacity

Select the correct answer using the codes given below.

Codes:
Answer.
- 1
  
  1, 2 and 3
- 2
  
  1 alone
- 3
  
  1 and 2
- 4
  
  2 and 3
Answer: 3

Explanation:

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