Soil Mechanics and Foundation Engineering Quiz | Soil Mechanics and Foundation Engineering Short Questions and Answers

Questions
41 Coefficient of permeability of soil
A does not depend upon temperature
B increases with the increase in temperature
C increases with the decrease in temperature
D none of the above

Answer: increases with the increase in temperature
42 Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability
A increases by 25%
B increases by 50%
C increases by 33.3%
D decreases by 33.3%

Answer: increases by 50%

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43 Which of the following methods is best suited for determination of permeability of coarse-grained soils ?
A constant head method
B falling head method
C both the above
D none of the above

Answer: constant head method
44 Which of the following methods is more suitable for the determination of permeability of clayey soil ?
A constant head method
B falling head method
C horizontal permeability test
D none of the above

Answer: falling head method
45 If the permeability of a soil is 0.8 mm/sec, the type of soil is
A gravel
B sand
C silt
D clay

Answer: sand
46 Effective stress on soil
A increases voids ratio and decreases permeability
B increases both voids ratio and permeability
C decreases both voids ratio and permeability
D decreases voids ratio and increases permeability

Answer: decreases both voids ratio and permeability
47 Select the correct statement.
A The greater the viscosity, the greater is permeability.
B The greater the unit weight, the greater is permeability.
C The greater the unit weight, the smaller is permeability.
D Unit weight does not affect per-meability.

Answer: The greater the unit weight, the greater is permeability.
48 Physical properties of a permeant which influence permeability are
A viscosity only
B unit weight only
C both viscosity and unit weight
D none of the above

Answer: both viscosity and unit weight
49 The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5 m, specific gravity 2.67 and voids ratio 0.67 is equal to
A 1.0m
B 1.5 m
C 2.0 m
D None of these

Answer: 1.5 m
50 Quick sand is a
A type of sand
B flow condition occurring in cohesive soils
C flow condition occurring in cohesionless soils
D flow condition occurring in both cohesive and cohesionless soils

Answer: type of sand
51 If the water table rises upto ground surface, then the
A effective stress is reduced due to decrease in total stress only but pore water pressure does not change
B effective stress is reduced due to increase in pore water pressure only but total stress does not change
C total stress is reduced due to increase in pore water pressure only but effec-tive stress does not change
D total stress is increased due to de-crease in pore water pressure but effective stress does not change

Answer: effective stress is reduced due to increase in pore water pressure only but total stress does not change
52 The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively
A zero and zero
B 0.5 kg/cm2 and zero
C 0.5 kg/cm2 and 0.5 kg/cm2
D 1.0 kg/cm2 and 0.5 kg/cm2

Answer: 0.5 kg/cm2 and zero
53 Rise of water table above the ground surface causes
A equal increase in pore water pressure and total stress
B equal decrease in pore water pressure and total stress
C increase in pore water pressure but decrease in total stress
D decrease in pore water pressure but increase in total stress

Answer: equal increase in pore water pressure and total stress
54 Effective stress is
A the stress at particles contact
B a physical parameter that can be measured
C important because it is a function of engineering properties of soil
D all of the above

Answer: important because it is a function of engineering properties of soil
55 Dispersed type of soil structure is an arrangement comprising particles having
A face to face or parallel orientation
B edge to edge orientation
C edge to face orientation
D all of the above

Answer: face to face or parallel orientation
56 The clay mineral with the largest swelling and shrinkage characteristics is
A kaolinite
B illite
C montmorillonite
D none of the above

Answer: montmorillonite
57 Inorganic soils with low compressibility are represented by
A MH
B SL
C ML
D None of these

Answer: ML
58 Highway Research Board (HRB) classification of soils is based on
A particle size composition
B plasticity characteristics
C both particle size composition and plasticity characteristics
D none of the above

Answer: both particle size composition and plasticity characteristics
59 The average coefficient of permeability of natural deposits
A parallel to stratification is always greater than that perpendicular to stratification
B parallel to stratification is always less than that perpendicular to stratification
C is always same in both directions
D parallel to stratification may or may not be greater than that perpendicular to stratification

Answer: parallel to stratification is always greater than that perpendicular to stratification
60 The total discharge from two wells situated near to each other is
A sum of the discharges from individual wells
B less than the sum of the discharges from individual wells
C greater than the sum of the discharges from individual wells
D equal to larger of the two discharges from individual wells

Answer: less than the sum of the discharges from individual wells
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