Soil Mechanics And Foundation Engineering Objective Questions – Set 1

March 22, 2017

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Soil Mechanics And Foundation Engineering Objective Questions – Set 1 (Part – A)

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Let’s start to solve the Soil Mechanics And Foundation Engineering Objective Questions – Set 1

Q1. The liquid limit of a soil mass is 20% and its plastic limit is 25%, then the plastic index of this soil is

(a) 5
(b) -5
(c) 0
(d) none of these

Answer – (c)

Q2. For a saturated clay of bulk density of 2 gm/cc, and moisture content of 30%. The void ratio is given by

(a) 0.462
(b) 0.875
(c) 1.462
(d) 1.857

Answer – (b)

Q3. The capillary tension in a soil mass having a void ratio of 0.70 and effective grain size of 0.1 mm will be

(a) 3.38 kN/m²
(b) 2.38 kN/m²
(c) 4.02 kN/m²
(d) none of these

Answer – (b)

Q4. In a saturated soil deposit having a density of 22 kN/m³, the effective normal stress on a horizontal plane at 5 m depth will be

(a) 22 kN/m²
(b) 50 kN/m²
(c) 60 kN/m²
(d) 110 kN/m²

Answer – (c)

Q5. In a compaction test, with increase in compactive effort

(a) both maximum dry density and optimum moisture content increases
(b) both maximum dry density and optimum moisture content decrease
(c) maximum dry density increases but optimum moisture content decreases
(d) maximum dry density decreases but optimum moisture content increases

Answer – (c)

Q6. In an unconfined compression test on a saturated clay, the undrained shear strength was found to be 10 t/m². If a sample of the same soil is tested on an undrained condition in triaxial compression at a cell pressure of 20 t/m² then the major principal stress at failure will be

(a) 48 t/m²
(b) 32 t/m²
(c) 40 t/m²
(d) 12 t/m²

Answer – (C)

Q7. For a clay of height 10 m, stability number is 0.05, bulk density is 20 kN/m²cohesion is 25 kN/m² then critical height of the slope in this soil is

(a) 4.0 m
(b) 12.5 m
(c) 25.0 m
(d) 15.0 m

Answer – (c)

Q8. A rectangular footing 1 m x 2 m is placed at a depth 2 m in a saturated clay having an unconfined compressive strength of 100 kN/m². According to Skempton, net ultimate bearing capacity is

(a) 420 kN/m²
(b) 412.5 kN/m²
(c) 385 kN/m²
(d) 350 kN/m²

Answer – (c)

Q 9. Contact pressure beneath a rigid footing resting on a cohesive soil is

(a) less at edges compared to the middle
(b) more at edges compared to the middle
(c) uniform throughout
(d) none of these

Answer – (b)

Q10. A saturated clay layer with single drainage face takes 4 years to attain 50% degree of consolidation. If clay layer had double drainage, then time to attain 50% of degree of consolidation is

(a) 8 year
(b) 4 year
(c) 2 year
(d) 1 year

Answer – (d)

Soil Mechanics And Foundation Engineering Objective Questions – Set 1 (Part – B)

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Q11. The residual factor is important in the investigation of slopes. If peak, residual and in situ shear strength of clay are 1.0 kg/cm²and 0.6 kg/cm², residual factor of the clay will be

(a) 1.5
(b) 0.67
(c) 0.60
(d) 0.40

Answer – (b)

Q12. A given soil sample have the following grain size analysis

< 2.00 mm – 80%

< 0.66 mm – 60%

< 0.075 mm – 30%

< 0.005 mm – 10%

< 0.002 mm – 2%

The soil is

(a) skip graded
(b) uniformly graded
(c) well graded
(d) average graded

Answer – (c)

Q13. Soil are arranged in face to face orientation, this type of soil structure is

(a) dispersed
(b) cohesive matrix
(c) honeycomb
(d) flocculent

Answer – (a)

Q14. The correct order of capillary rise in increase order in different types of soils is

(a) fine sand, clay, silt, colloids
(b) silt, fine sand, clay, colloids
(c) fine sand, clay, colloids, silt
(d) fine sand, silt, clay, colloids

Answer – (a)

Q15. If ratio of specific yield to specific retention of an aquifer with porosity 50% is 1.5, the specific yield from it is

(a) 20%
(b) 37.5%
(c) 30%
(d) 25%

Answer – (a)

Q 16. A concentrated load acting on the surface of a soil produces a stress 10 kPa at a depth of 1m below. The stress at 2m depth will be what when Boussinwsq’s expression is to be taken?

(a) 3 KPa
(b) 5 KPa
(c) 6 KPa
(d) 8 KPa

Answer – (b)

Q17. Ten concentric circles with 10 radial lines are present in a particular stress distribution. When Newmark’s influence chart is to be used, what will be the influence factor of a chart?

(a) 0.01
(b) 0.1
(c) 0.0001
(d) 0.001

Answer – (d)

Q18. The change in the verticle stress in the soil mass estimated by Boussinesq’s equation when Poisson’s ratio of soil changes from 0.3 to 0.5 will be