Soil Mechanics and Foundation Sheet 9

1) Question.

Stoke's law is applicable to particles upto........ effective diameter.
Answer.
- 1
  
  0.0002 mm
- 2
  
  0.002 mm
- 3
  
  0.02 mm
- 4
  
  0.2 mm
Answer: 1

Explanation:
2) Question.

The uniformity coefficient for a uniformly graded soil is nearly unity.
Answer.
- 1
  
  Agree
- 2
  
  Disagree
Answer: 1

Explanation:
3) Question.

A soil having uniformity co-efficient more than 10, is called
Answer.
- 1
  
  uniform soil
- 2
  
  poor soil
- 3
  
  well graded soil
- 4
  
  coarse soil
Answer: 3

Explanation:
4) Question.

A soil having particles of nearly the same size is known as
Answer.
- 1
  
  uniform soil
- 2
  
  poor soil
- 3
  
  well graded soil
- 4
  
  coarse soil
Answer: 1

Explanation:
5) Question.

The particle size range is measured by
Answer.
- 1
  
  effective size
- 2
  
  curvature coefficient
- 3
  
  uniformity coefficient
- 4
  
  none of these
Answer: 3

Explanation:
6) Question.

The uniformity co-efficient of soil is defined as the ratio of
Answer.
- 1
  
  $D_{40} t o D_{10}$
- 2
  
  $D_{40} t o D_{20}$
- 3
  
  $D_{50} t o D_{10}$
- 4
  
  $D_{60} t o D_{10}$
Answer: 4

Explanation:
7) Question.

The effective size of a soil is
Answer.
- 1
  
  $D_{10}$
- 2
  
  $D_{20}$
- 3
  
  $D_{40}$
- 4
  
  $D_{60}$
Answer: 1

Explanation:
8) Question.

Sieving is not practicable for grain sizes smaller than about
Answer.
- 1
  
  0.075 mm
- 2
  
  0.095 mm
- 3
  
  0.15 mm
- 4
  
  0.2 mm
Answer: 1

Explanation:
9) Question.

Which of the following clay mineral gives maximum swelling?
Answer.
- 1
  
  Kalonite
- 2
  
  Montmorillonite
- 3
  
  Illite
- 4
  
  all of these
Answer: 2

Explanation:
10) Question.

The dry density of a soil is $1.5 g / c m^{3}$ . If the saturation water content is 50%, then its saturated density and submerged density will respectively be
Answer.
- 1
  
  $1.5 g / c m^{3} a n d 1.0 g / c m^{3}$
- 2
  
  $2.0 g / c m^{3} a n d 1 g / c m^{3}$
- 3
  
  $2.25 g / c m^{3} a n d 1.25 g / c m^{3}$
- 4
  
  $2.50 g / c m^{3} a n d 1.50 g / c m^{3}$
Answer: 3

Explanation:
11) Question.

During seepage through an earth mass, the direction of seepage is
Answer.
- 1
  
  parallel to the equipotential lines
- 2
  
  perpendicular to the stream lines
- 3
  
  perpendicular to the equipotential lines
- 4
  
  along the direction of gravity
Answer: 3

Explanation:
12) Question.

A sample of clay and a sample of sand have the same specific gravity and void ratio. Their permeabilities would differ because
Answer.
- 1
  
  their porosities would be different
- 2
  
  their degrees of saturation would be different
- 3
  
  their densities would be different
- 4
  
  the size rangs of their voids would be different
Answer: 4

Explanation:
13) Question.

If the settlement of a single pile in sand is denoted by S and that of a group of N identical piles (each pile carrying the same load) by Sg, then the ratio Sg/S will
Answer.
- 1
  
  be equal to 1 irrespective of width of the group
- 2
  
  be equal to N irrespetive of width of the group
- 3
  
  decrease as the width of the group increases
- 4
  
  increase as the width of the group increases
Answer: 4

Explanation:
14) Question.

A vane shear test on a soil sample gives moment of total resistance M. The shear stress failure, 'S' being more or less uniform at top, bottom and surface of cylinder of soil, is given by (where H=height of vane, D=Diameter of vane)
Answer.
- 1
  
  $S = \frac{2 M}{{πD}^{2} H}$
- 2
  
  $S = \frac{2 M}{{πD}^{2} (H + D)}$
- 3
  
  $S = \frac{2 M}{{πD}^{2} (H + \frac{D}{3})}$
- 4
  
  $S = \frac{2 M}{πDH}$
Answer: 3

Explanation:
15) Question.

For sampling saturated sands and other soft and wet soils satisfactorily, the most suitable soil sampler is
Answer.
- 1
  
  Open drive thin-walled tube sampler
- 2
  
  standard split-spoon sampler
- 3
  
  stationary piston sampler
- 4
  
  rotary sampler
Answer: 2

Explanation:
16) Question.

Which one of the following, gives the correct decreasing order of the densities of a soil sample?
Answer.
- 1
  
  Saturated, submerged, wet, dry
- 2
  
  Saturated, west, submerged, dry
- 3
  
  Saturated, wet, dry, submerged
- 4
  
  Wet, saturated, submerged, dry
Answer: 3

Explanation:
17) Question.

Consider the following factors pertaining to flow through soil:

1. Hydraulic gradient

2. Grain size

3. Void ratio

4. Cross-sectional area of the sample

Of these, the factors affecting permeability include
Answer.
- 1
  
  1 and 4
- 2
  
  2 and 3
- 3
  
  1, 2 and 3
- 4
  
  2, 3 and 4
Answer: 2

Explanation:
18) Question.

Given below are methods of compation

1. Vibration technique

2. Flooding the soil

3. Sheep-foot roller

4. Tandem roller

5. Heavy weights dropped from a height

The methods suitable for cohesionless soils include
Answer.
- 1
  
  1, 2 and 3
- 2
  
  2, 3 and 4
- 3
  
  1, 2 and 5
- 4
  
  3, 4 and 5
Answer: 3

Explanation:
19) Question.

By using sieve analysis, the particle size distribution curve has been plotted for a particular soil. The coefficient of curvature $C_{e}$ is given by
Answer.
- 1
  
  $\frac{D_{30}}{D_{30} x D_{10}}$
- 2
  
  $\frac{\sqrt{D_{30}}}{D_{60} x D_{10}}$
- 3
  
  $\frac{D_{30}}{\sqrt{D_{60} x D_{10}}}$
- 4
  
  $\frac{D_{30}^{2}}{D_{60} x D_{10}}$
Answer: 4

Explanation:
20) Question.

According to Businesq's theory, the vertical stress at a point in a semi-infinite soil mass depends upon
Answer.
- 1
  
  point load, coordinates of the point and modulus of elasticity of soil
- 2
  
  point load, coordinates of the point,modulus of elasticity of soil and its Poission's ratio
- 3
  
  point load and coordinates of the point
- 4
  
  point load, coordinates of the point, modulus of elasticity of soil and its density
Answer: 3

Explanation:

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