Soil Mechanics and Foundation Sheet 8

1) Question.

According to Indian standards, in a 2 mm sieve
Answer.
- 1
  
  there are two holes
- 2
  
  each sieve is circular and its diameter is 2 mm
- 3
  
  each hole is a square and its side is 2 mm
- 4
  
  there are two holes per cm length of the mesh
Answer: 3

Explanation:
2) Question.

The smallest sieve size according to Indian standards is
Answer.
- 1
  
  0.0045 mm
- 2
  
  0.045 mm
- 3
  
  0.45 mm
- 4
  
  0.154 mm
Answer: 2

Explanation:
3) Question.

According to Indian standards, the dispersing solution used in pipette method, for the determination of size of particle consists of
Answer.
- 1
  
  7 g sodium carbonate, 43 g sodium hexameta-phosphate and 1 litre distilled water
- 2
  
  7 g sodium carbonate, 33 g sodium hexameta-phosphate and 1 litre distilled water
- 3
  
  7 g sodium carbonate, 23 g sodium hexameta-phosphate and 1 litre distilled water
- 4
  
  any one of the above
Answer: 2

Explanation:
4) Question.

According to Stoke's law, the velocity at which grains settle out of suspension, all other factors being equal, is dependent upon
Answer.
- 1
  
  shape of the grain
- 2
  
  weight of the grain
- 3
  
  size of the grain
- 4
  
  all of these
Answer: 4

Explanation:
5) Question.

When the hydrometer analysis is performed, it requires correction for
Answer.
- 1
  
  temperature only
- 2
  
  meniscus only
- 3
  
  dispersing agent only
- 4
  
  all of these
Answer: 4

Explanation:
6) Question.

The standard temperature at which the hydrometer is calibrated is
Answer.
- 1
  
  $10^{0} C$
- 2
  
  $15^{0} C$
- 3
  
  $20^{0} C$
- 4
  
  $27^{0} C$
Answer: 4

Explanation:
7) Question.

Hydrometer analysis is used to determine the density of soil suspension.
Answer.
- 1
  
  Agree
- 2
  
  Disagree
Answer: 1

Explanation:
8) Question.

stoke's law is used to determine the
Answer.
- 1
  
  specific gravity of soil solids
- 2
  
  density of soil suspension
- 3
  
  grain size distribution of those soils whose grain size is finer than 0.075 mm
- 4
  
  all of the above
Answer: 3

Explanation:
9) Question.

According to Pycnometer method, the specific gravity of soil solids (G) is given by

[ $M_{1}$ = Mass of Pycnometer, $M_{2}$ = Mass of Pycnometer and dry soil, $M_{3}$ = Mass of Pycnometer, soil solids and water, $M_{4}$ = Mass of Pycnometer and water]
Answer.
- 1
  
  $G = \frac{M_{1} + M_{2}}{M_{1} - M_{2} + M_{3} - M_{4}}$
- 2
  
  $G = \frac{M_{1} + M_{3}}{M_{1} + M_{2} - M_{3} - M_{4}}$
- 3
  
  $G = \frac{M_{2} - M_{1}}{M_{2} + M_{4} - M_{1} - M_{3}}$
- 4
  
  $G = \frac{M_{1} + M_{2}}{M_{2} + M_{4} - M_{1} - M_{3}}$
Answer: 3

Explanation:
10) Question.

The dry density of a soil is same as the unit weight of solids.
Answer.
- 1
  
  True
- 2
  
  False
Answer: 2

Explanation:
11) Question.

The slope of ischorone at any point at a given time indicates the rate of change of
Answer.
- 1
  
  effective stress with time
- 2
  
  effective stress with depth
- 3
  
  pore water pressure with depth
- 4
  
  pore water pressure with time
Answer: 3

Explanation:
12) Question.

Terzahi's basic differential equal for one dimensional consolidation of clayey solis is
Answer.
- 1
  
  $\frac{δ u}{\partial t} = C_{v} \frac{δ u}{\partial z}$
- 2
  
  $\frac{δ u}{\partial z} = C_{v} \frac{\partial^{2} u}{\partial t^{2}}$
- 3
  
  $\frac{\partial^{2} u}{\partial t^{2}} = C_{v} \frac{δ u}{\partial z}$
- 4
  
  $\frac{δ u}{\partial t} = C_{v} \frac{\partial^{2} u}{\partial z^{2}}$
Answer: 4

Explanation:
13) Question.

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

Explanation:
14) Question.

Rate of consolidation
Answer.
- 1
  
  increases with decrease in temperature
- 2
  
  increases with increase in temperature
- 3
  
  is independent of temperature
- 4
  
  is unaffected by permeability of soil
Answer: 2

Explanation:
15) Question.

The hydrostatic pressure on the pnreatic line with a dam section is
Answer.
- 1
  
  less than atmospheric pressure
- 2
  
  equal to atmospheric pressure
- 3
  
  greater than atmospheric pressure
- 4
  
  none of the above
Answer: 2

Explanation:
16) Question.

Vertical stress on a vertical line at a constant radial distance from the axis of a vertical load
Answer.
- 1
  
  is same at all depths
- 2
  
  increases with depth
- 3
  
  first increases, attains a maximum value and then decreases
- 4
  
  first decreases, attains a minimum value and then increases
Answer: 3

Explanation:
17) Question.

Boussinesq's influence factor for vertical pressure at depth z and at the centre of a circular area of diameter 'a' carrying uniformly distributed load is
Answer.
- 1
  
  ${[1 - \frac{1}{1 + (\frac{a}{z})}]}^{\frac{3}{2}}$
- 2
  
  $\frac{3}{2 π} {[\frac{1}{1 + {(\frac{a}{z})}^{2}}]}^{\frac{5}{2}}$
- 3
  
  $1 - {[\frac{1}{1 + {(\frac{a}{z})}^{2}}]}^{\frac{3}{2}}$
- 4
  
  $1 - {[\frac{1}{1 + {(\frac{a}{2 z})}^{2}}]}^{\frac{3}{2}}$
Answer: 4

Explanation:
18) Question.

The flownet for an earthen dam with 30 m water depth consists of 25 potential drops and 5 flow channels. The conefficient of permeability of dam meterical is 0.03 mm/sec. The discharge per metre length of dam is
Answer.
- 1
  
  $0.00018 m^{3} / s e c$
- 2
  
  $0.0045 m^{3} / s e c$
- 3
  
  $0.18 m^{3} / s e c$
- 4
  
  $0.1125 m^{3} / s e c$
Answer: 1

Explanation:
19) Question.

Due to a rise in temperature, the viscosity and the unit weight of the percolatiing fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability
Answer.
- 1
  
  increases by 25%
- 2
  
  increases by 50%
- 3
  
  increases by 33.3%
- 4
  
  decreases by 33.3%
Answer: 2

Explanation:
20) Question.

Which of the following methods is best suited for determination of permeability of coarse-grained soils?
Answer.
- 1
  
  constant head method
- 2
  
  falling head method
- 3
  
  both the above
- 4
  
  none of the above
Answer: 1

Explanation:

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