Soil Mechanics MCQs | Soil Mechanics Multiple Choice Questions and Answers

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Questions
1 Residual soils are formed by
A glaciers
B wind
C water
D none of the above

Answer: none of the above
2 Water content of soil can
A never be greater than 100 %
B take values only from 0 % to 100 %
C be less than 0 %
D be greater than 100 %

Answer: be greater than 100 %
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3 A fully saturated soil is said to be
A one phase system
B two phase system with soil and air
C two phase system with soil and water
D three phase system

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

Answer: 20.0 kN/m3
5 Select the correct statement.
A Unit weight of dry soil is greater than unit weight of wet soil
B For dry soils, dry unit weight is less than total unit weight
C Unit weight of soil increases due to submergence in water
D Unit weight of soil decreases due to submergence in water

Answer: Unit weight of soil decreases due to submergence in water
6 If the volume of voids is equal to the volume of solids in a soil mass, then the values of porosity and voids ratio respectively are
A 1.0 and 0.0
B 0.0 and 1.0
C 0.5 and 1.0
D 1.0 and 0.5

Answer: 0.5 and 1.0
7 When the degree of saturation is zero, the soil mass under consideration represents
A one phase system
B two phase system with soil and air
C two phase system with soil and water
D three phase system

Answer: two phase system with soil and air
8 If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is
A less than specific gravity of soil
B equal to 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
9 Which of the following methods is most accurate for the determination of the water content of soil ?
A oven drying method
B sand bath method
C calcium carbide method
D pycnometer method

Answer: oven drying method
10 Stoke's law is valid only if the size of particle is
A less than 0.0002 mm
B greater than 0.2 mm
C between 0.2 mm and 0.0002 mm
D None of the mentioned

Answer: between 0.2 mm and 0.0002 mm
11 In hydrometer analysis for a soil mass
A both meniscus correction and dispersing agent correction are additive
B both meniscus correction and dispersing agent correction are subtractive
C meniscus correction is additive and dispersing agent correction is subtractive
D meniscus correction is subtractive and dispersing agent correction is additive

Answer: meniscus correction is additive and dispersing agent correction is subtractive
12 The hydrometer method of sedimentation analysis differs from the pipette analysis mainly in
A the principle of test
B the method of taking observations
C the method of preparation of soil suspension
D all of the above

Answer: the method of taking observations
13 Uniformity coefficient of a soil is
A always less than 1
B always equal to 1
C equal to or less than 1
D equal to or gi eater than 1

Answer: equal to or gi eater than 1
14 Toughness index is defined as the ratio of
A plasticity index to consistency index
B plasticity index to flow index
C liquidity index to flow index
D consistency index to liquidity index

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

Answer: decrease in both liquid limit and plasticity index
16 Select the correct statement.
A A uniform soil has more strength and stability than a non-uniform soil
B A uniform soil has less 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
17 At liquid limit, all soils possess
A same shear strength of small magnitude
B same shear strength of large magnitude
C different shear strengths of small magnitude
D different shear strengths of large magnitude

Answer: same shear strength of small magnitude
18 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
19 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
20 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

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