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

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/m
^{2} - (b) 2.38 kN/m
^{2} - (c) 4.02 kN/m
^{2} - (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/m
^{2} - (b) 50 kN/m
^{2} - (c) 60 kN/m
^{2} - (d) 110 kN/m
^{2}

**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/m ^{2}. If a sample of the same soil is tested on an undrained condition in triaxial compression at a cell pressure of 20 t/m^{2 }**

**then the major principal stress at failure will be**

- (a) 48 t/m
^{2} - (b) 32 t/m
^{2} - (c) 40 t/m
^{2} - (d) 12 t/m
^{2}

**Answer – (C)**

**Q7. For a clay of height 10 m, stability number is 0.05, bulk density is 20 kN/m ^{2 }cohesion is 25 kN/m^{2 } 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/m ^{2}. According to Skempton, net ultimate bearing capacity is**

- (a) 420 kN/m
^{2} - (b) 412.5 kN/m
^{2} - (c) 385 kN/m
^{2} - (d) 350 kN/m
^{2}

**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)

**Books for Soil Mechanics And Foundation Engineering –**

- Soil Mechanics And Foundation Engineering
- Soil Mechanics and Foundations by Laxmi Publications
- Soil Mechanics and Foundation Engineering (WIND) by Wiley
- Soil Mechanics and Foundation Engineering,1/E by Khanna
- Soil Mechanics and Foundations by Wiley
- Design Aids In Soil Mechanics and Foundation Engineering by McGraw-Hill Education

**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/cm ^{2 }and 0.6 kg/cm^{2}, 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**

- (a) reduction by 30%
- (b) increase by 50%
- (c) reduction by 20%
- (d) no change

**Answer – (d)**

**Q19. Pile caps are used on a group of piles to**

- (a) increase the load bearing capacity of each pile.
- (b) protect the piles from lateral displacement.
- (c) protect in case of offshore structure.
- (d) spread the horizontal and verticle loads to all the piles.

**Answer – (d)**

**Q20. The installation of sand drains in the clayey soil causes the soil adjacent to the sand drains to undergo which one of the following?**

- (a) Increase in porosity
- (b) Increase in compressibility
- (c) Decrease in horizontal permeability
- (d) Decrease in shear strength

**Answer – (c)**