Soil Mechanics and Foundation Sheet 19

1) Question.

The coefficient of consolidation is measured in
Answer.
- 1
  
  $c m^{2} / g$
- 2
  
  $c m^{2} / s$
- 3
  
  $g / c m^{2} / s$
- 4
  
  $c m^{2} / g / s$
Answer: 2

Explanation:
2) Question.

If a shear stress is applied on a dense sand, the shear strain caused will........ the volume of sand.
Answer.
- 1
  
  increase
- 2
  
  decrease
- 3
  
  not effect
Answer: 1

Explanation:
3) Question.

The density of sand at which there is no change in volume under the influence of shearing strain produced due to shear stress, is called
Answer.
- 1
  
  relative density
- 2
  
  apparent density
- 3
  
  critical density
- 4
  
  any one of these
Answer: 3

Explanation:
4) Question.

The angle of internal friction
Answer.
- 1
  
  varies with the density of sand
- 2
  
  depends upon the amount of interlock
- 3
  
  depends upon the particle shape and roughness
- 4
  
  all of the above
Answer: 4

Explanation:
5) Question.

The expansion of soil due to shear at a constant value of pressure is called
Answer.
- 1
  
  apparent cohesion
- 2
  
  true cohesion
- 3
  
  dilatancy
- 4
  
  consistency
Answer: 3

Explanation:
6) Question.

The shear strength of a soil
Answer.
- 1
  
  is proportional to the cohesion of the soil
- 2
  
  is proportional to the tangent of the angle of internal friction
- 3
  
  increases with the increase in normal stress of soil
- 4
  
  all of the above
Answer: 4

Explanation:
7) Question.

The strength of a soil is usually identified by
Answer.
- 1
  
  direct tensile stress
- 2
  
  direct compressive stress
- 3
  
  ultimate shear stress
- 4
  
  effective stress
Answer: 3

Explanation:
8) Question.

The ultimate settlement of a soil
Answer.
- 1
  
  is directly proportional to the compression index
- 2
  
  decreases with an increase in the initial void ratio
- 3
  
  is directly proportional to the depth of the compressible soil mass
- 4
  
  all of the above
Answer: 4

Explanation:
9) Question.

The compression index of the soil
Answer.
- 1
  
  increases with the increase in liquid limit
- 2
  
  decreases with the increase in liquid limit
- 3
  
  increases with the decrease in plastic limit
- 4
  
  decreases with the increase in plastic limit
Answer: 1

Explanation:
10) Question.

The coefficient of volume compressibility..... with the increase in pressure.
Answer.
- 1
  
  increases
- 2
  
  decreases
- 3
  
  does not change
Answer: 2

Explanation:
11) Question.

For sand of uniform spherical particles, the ratio of void ratios in the loosest and the densest states is:
Answer.
- 1
  
  2.6
- 2
  
  3.5
- 3
  
  4.6
- 4
  
  3.0
Answer: 1

Explanation:
12) Question.

For an anisotropic soil, premebilities in x and y directions are $K_{x} a n d K_{y}$ respectively in a two dimensional flow. The effective permeability $K_{e q}$ for the soil is given by:
Answer.
- 1
  
  $K_{x} + K_{y}$
- 2
  
  $K_{x} / K_{y}$
- 3
  
  ${({K_{x}}^{2} + {K_{y}}^{2})}^{1 / 2}$
- 4
  
  ${(K_{x} K_{y})}^{1 / 2}$
Answer: 4

Explanation:
13) Question.

A shallow foundation is defined as a foundation which
Answer.
- 1
  
  has low bearing capacity
- 2
  
  has a depth of embedment less than its width
- 3
  
  is resting on the ground surface
- 4
  
  causes less settlement
Answer: 2

Explanation:
14) Question.

The largest value of stability number is
Answer.
- 1
  
  0.261
- 2
  
  0.5
- 3
  
  1.0
- 4
  
  2.0
Answer: 1

Explanation:
15) Question.

The radius of friction circle or $ϕ$ -circle in friction circle method is

where r is the radius of failure arc
Answer.
- 1
  
  r
- 2
  
  $r \sin ϕ$
- 3
  
  $r \cos ϕ$
- 4
  
  $r \tan ϕ$
Answer: 2

Explanation:
16) Question.

Generally the bearing capacity of a pile group is
Answer.
- 1
  
  equal to the sum of bearing capacities of individual piles in case of friction piles
- 2
  
  equal to the sum of bearing capacities of individual piles in case of end bearing piles
- 3
  
  less than the sum of bearing capacities of individual piles in case of end bearing piles
- 4
  
  greater than the sum of bearing capacities of individual piles in case of friciton or end bearing piles.
Answer: 2

Explanation:
17) Question.

A single acting steam hammer weighing 22.5 kN and falling through a height of 1.2 m drives a pile. If the final set is 12.5 mm, the then according to Engineering News formula
Answer.
- 1
  
  allowable load for the pile is 300 kN
- 2
  
  ultimate bearing capacity of the pile is 300 kN
- 3
  
  allowable load for the pile is 120 kN
- 4
  
  ultimate bearing capacity of the pile is 120 kN
Answer: 1

Explanation:
18) Question.

Negative skin friction on a pile
Answer.
- 1
  
  acts downward and increases the load carrying capacity of the pile
- 2
  
  acts upward and increases the load carrying capacity of the pile
- 3
  
  acts downward and reduces the load carrying capacity of the pile
- 4
  
  acts upward and reduces the load carrying capacity of the pile
Answer: 3

Explanation:
19) Question.

A combined footing is generally used when
Answer.
- 1
  
  number of columns is more than two and they are spaced far apart
- 2
  
  number of columns is two and they are spaced close to each other
- 3
  
  number of columns is two and they are spaced far apart
- 4
  
  there is only one column
Answer: 2

Explanation:
20) Question.

The maximum differential settlement in isolated footings on clayey soils should be limited to
Answer.
- 1
  
  25 mm
- 2
  
  40 mm
- 3
  
  65 mm
- 4
  
  100 mm
Answer: 2

Explanation:

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