Soil Mechanics And Foundation Sheet 34

1) Question.

Sheep-foot rollers are recommended for compacting
Answer.
- 1
  
  granular soils
- 2
  
  cohesive soils
- 3
  
  hard rock
- 4
  
  any type of soil
Answer: 2

Explanation:
2) Question.

A soil has liquid limit of 60%, plastic limit of 35% and shrinkage limit of 20% and it has a natural moisture content of 50%. The liquidity index of soil is
Answer.
- 1
  
  1.5
- 2
  
  1.25
- 3
  
  0.6
- 4
  
  0.4
Answer: 3

Explanation:
3) Question.

Consider the following assumptions for slope stability analysis:

1. Friction is fully mobilizaed.

2. Effective stress analysis is adopted.

3. Total stress analysis is used.

4. Resultant 'R' passes thorugh the centre of the circle.

5. Resultant 'R' is tangential to the friction circle.

The assumptions necessary for friction circle method of analysis would include
Answer.
- 1
  
  1, 3 and 4
- 2
  
  1, 3 and 5
- 3
  
  2 and 4
- 4
  
  2 and 5
Answer: 2

Explanation:
4) Question.

A retaining wall retains a sand strata with $ϕ = 30 °$ upto its top. If a uniform surcharge of $12 t / m^{2}$ is subsequently put on the sand strata, then the increase in the lateral earth pressure intensity on the retaining wall will be
Answer.
- 1
  
  $1 t / m^{2}$
- 2
  
  $2 t / m^{2}$
- 3
  
  $4 t / m^{2}$
- 4
  
  $8 t / m^{2}$
Answer: 3

Explanation:
5) Question.

A laboratory vane shear test apparatus is used to determine the shear strength of a clay sample and only one end of the vane takes part is shearing the soil. If T = applied torque, H = height of vane and D = diameter of the vane, then the shear strength of the clay is given by
Answer.
- 1
  
  $\frac{T}{{πD}^{2} (H + \frac{D}{6})}$
- 2
  
  $\frac{T}{{πD}^{2} (\frac{H}{2} + \frac{D}{6})}$
- 3
  
  $\frac{T}{{πD}^{2} (H + \frac{D}{12})}$
- 4
  
  $\frac{T}{{πD}^{2} (\frac{H}{2} + \frac{D}{12})}$
Answer: 4

Explanation:
6) Question.

A flownet is drawn to obtain
Answer.
- 1
  
  seepage, coefficient of permeability and uplift pressure
- 2
  
  coefficient of permeability, uplift pressure and exit gradient
- 3
  
  exit gradient, uplift pressure and seepage quantity
- 4
  
  exit gradient, seepage and coefficient of permeability
Answer: 3

Explanation:
7) Question.

If during a permeability test on a soil sample with a falling head permeameter, equal time intervals are noted for drop of head from $h_{1}$ to $h_{2}$ and again from $h_{2}$ to $h_{3}$ then which one of the following relations would hold good?
Answer.
- 1
  
  ${h_{3}}^{2} = h_{1} h_{2}$
- 2
  
  ${h_{2}}^{2} = h_{1} h_{3}$
- 3
  
  ${h_{1}}^{2} = h_{2} h_{3}$
- 4
  
  $(h_{1} - h_{2}) = (h_{2} - h_{3})$
Answer: 2

Explanation:
8) Question.

A soil has a discharge velocity of $6 x 10^{- 7} m / s$ and a void ratio of 0.5. Its seepage velocity is
Answer.
- 1
  
  $18 x 10^{- 7} m / s$
- 2
  
  $12 x 10^{- 7} m / s$
- 3
  
  $6 x 10^{- 7} m / s$
- 4
  
  $3 x 10^{- 7} m / s$
Answer: 1

Explanation:
9) Question.

A soil sample has a shrinkage limit of 10% and specific gravity of soil solids as 2.7. The porosity of the soil at shrinkage limit is
Answer.
- 1
  
  21.2%
- 2
  
  27%
- 3
  
  73%
- 4
  
  78.8%
Answer: 1

Explanation:
10) Question.

As per Indian code of practice, the frequency ratio (ratio of operating frequency of a machine to the natuaral frequency of soil) should not be within the range of
Answer.
- 1
  
  0.5 to 1.5
- 2
  
  1.0 to 2.5
- 3
  
  1.5 to 3.0
- 4
  
  3.0 to 6.0
Answer: 1

Explanation:

Soil Mechanics and Foundation Sheet 34

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