Geotechnical Engineering MCQs | Geotechnical Engineering Multiple Choice Questions and Answers

Questions
1 A fully saturated soil is said to be
A two phase system with soil and water
B one phase system
C two phase system with soil and air
D three phase system

Answer: two phase system with soil and water
2 A soil has a bulk density of 22 kN/m3 and water content 10 %. The dry density of soil is
A 20.0 kN/m3
B 18.6 kN/m3
C 22.0 kN/m3
D 23.2 kN/m3

Answer: 20.0 kN/m3

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3 Select the correct statement.
A Unit weight of soil decreases due to submergence in water
B Unit weight of dry soil is greater than unit weight of wet soil
C For dry soils, dry unit weight is less than total unit weight
D Unit weight of soil increases due to submergence in water

Answer: Unit weight of soil decreases due to submergence in water
4 If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is
A equal to specific gravity of soil
B less than specific gravity of soil
C greater than specific gravity of soil
D independent of specific gravity of soil

Answer: equal to specific gravity of soil
5 Which of the following methods is most accurate for the determination of the water content of soil ?
A sand bath method
B calcium carbide method
C oven drying method
D pycnometer method

Answer: oven drying method
6 In hydrometer analysis for a soil mass
A meniscus correction is additive and dispersing agent correction is subtractive
B both meniscus correction and dispersing agent correction are additive
C both meniscus correction and dispersing agent correction are subtractive
D meniscus correction is subtractive and dispersing agent correction is additive

Answer: meniscus correction is additive and dispersing agent correction is subtractive
7 Which of the following is a measure of particle size range ?
A uniformity coefficient
B effective size
C coefficient of curvature
D none of the above

Answer: uniformity coefficient
8 Uniformity coefficient of a soil is
A equal to or gi eater than 1
B always less than 1
C always equal to 1
D equal to or less than 1

Answer: equal to or gi eater than 1
9 Toughness index is defined as the ratio of
A plasticity index to flow index
B plasticity index to consistency index
C liquidity index to flow index
D None of the above

Answer: plasticity index to flow index
10 The admixture of coarser particles like sand or silt to clay causes
A decrease in both liquid limit and plasticity index
B decrease in liquid limit and increase in plasticity index
C decrease in liquid limit and no change in plasticity index
D increase in both liquid limit and plasticity index

Answer: decrease in both liquid limit and plasticity index
11 Select the correct statement.
A A uniform soil has less strength and stability than a non-uniform soil
B A uniform soil has more strength and stability than a non-uniform soil
C Uniformity coefficient does not affect strength and stability
D Uniformity coefficient of a poorly graded soil is more than that of a well graded soil

Answer: A uniform soil has less strength and stability than a non-uniform soil
12 At liquid limit, all soils possess
A same shear strength of large magnitude
B different shear strengths of small magnitude
C different shear strengths of large magnitude
D same shear strength of small magnitude

Answer: same shear strength of small magnitude
13 If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then
A the liquid limit of soil always decreases
B the liquid limit of soil may increase
C the liquid limit of soil may decrease
D the liquid limit of soil always increases

Answer: the liquid limit of soil always increases
14 According to IS classification, the range of silt size particles is
A 0.075 mm to 0.002 mm
B 4.75 mm to 2.00 mm
C 2.00 mm to 0.425 mm
D 0.425 mm to 0.075 mm

Answer: 0.075 mm to 0.002 mm
15 Dispersed type of soil structure is an arrangement comprising particles having
A edge to edge orientation
B edge to face orientation
C face to face or parallel orientation
D all of the above

Answer: face to face or parallel orientation
16 Rise of water table above the ground surface causes
A equal decrease in pore water pressure and total stress
B increase in pore water pressure but decrease in total stress
C decrease in pore water pressure but increase in total stress
D equal increase in pore water pressure and total stress

Answer: equal increase in pore water pressure and total stress
17 Select the correct statement.
A The greater the unit weight, the greater is permeability
B The greater the viscosity, 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
18 Effective stress on soil
A decreases both voids ratio and permeability
B increases voids ratio and decreases permeability
C increases both voids ratio and permeability
D None of the above

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

Answer: falling head method
20 Coefficient of permeability of soil
A increases with the increase in temperature
B does not depend upon temperature
C increases with the decrease in temperature
D none of the above

Answer: increases with the increase in temperature
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