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soil mechanics and foundation engineering MCQs

Practise focused soil mechanics and foundation engineering questions with marked answers for exam preparation and subject revision.

soil mechanics and foundation engineering Mcqs

1. For a loose sand sample and a dense sand sample consolidated to the same effective stress_____________?
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A. ultimate strength is different but peak strength is same

B. ultimate strength is same but peak strength of dense sand is greater than that of loose sand

C. ultimate strength is same and also peak strength is same

D. ultimate strength is same but peak

2. Which of the following is a measure of particle size range ?
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A. coefficient of curvature

B. none of the above

C. uniformity coefficient

D. effective size

3. A fully saturated soil is said to be________________?
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A. two phase system with soil and water

B. three phase system

C. two phase system with soil and air

D. one phase system

4. Time factor for a clay layer is_______________?
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A. independent of thickness of clay layer

B. inversely proportional to drainage path

C. a dimensional parameter

D. directly proportional to permeability of soil

5. Highway Research Board (HRB) classification of soils is based on__________________?
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A. particle size composition

B. plasticity characteristics

C. both particle size composition and plasticity characteristics

D. none of the above

6. If the water table rises upto ground surface, then the___________________?
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A. total stress is increased due to de-crease in pore water pressure but effective stress does not change

B. total stress is reduced due to increase in pore water pressure only but effec-tive stress does not change

C. effective stress is reduced due to increase in pore water pressure only but total stress does not change

D. effective stress is reduced due to decrease in total stress only but pore water pressure does not change

7. In the plate loading test for determining the bearing capacity of soil, the size of square bearing plate should be_________________?
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A. between 300 mm and 750 mm

B. greater than 1 m

C. between 750 mm and 1 m

D. less than 300 mm

8. The total discharge from two wells situated near to each other is_________________?
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A. greater than the sum of the discharges from individual wells

B. less than the sum of the discharges from individual wells

C. equal to larger of the two discharges from individual wells

D. sum of the discharges from individual wells

9. Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is_________________?
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A. 6 months

B. 3 months

C. 12 months

D. 24 months

10. 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_______________?
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A. 1.5 m

B. 3m

C. 2.0 m

D. 1.0m

11. Uniformity coefficient of a soil is__________________?
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A. always less than 1

B. equal to or less than 1

C. always equal to 1

D. equal to or gi eater than 1

12. The ultimate consolidation settlement of a soil is________________?
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A. directly proportional to the voids ratio

B. directly proportional to the compression index

C. inversely proportional to the compression index

D. none of the above

13. Select the correct statement?
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A. Unit weight of soil increases due to submergence in water

B. Unit weight of dry soil is greater than unit weight of wet soil

C. Unit weight of soil decreases due to submergence in water

D. For dry soils, dry unit weight is less than total unit weight

14. Rise of water table in cohesionless soils upto ground surface reduces the net ultimate bearing capacity approximately by________________?
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A. 90%

B. 50%

C. 25%

D. 75%

15. Allowable bearing pressure for a foundation depends upon_______________?
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A. allowable settlement only

B. ultimate bearing capacity of soil only

C. both allowable settlement and ultimate bearing capacity

D. none of above

16. If the voids of a soil mass are full of air only, the soil is termed as_______________?
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A. air entrained soil

B. dry soil

C. partially saturated soil

D. dehydrated soil

17. The slope of isochrone at any point at a given time indicates the rate of change of_______________?
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A. pore water pressure with depth

B. effective stress with depth

C. effective stress with time

D. pore water pressure with time

18. If the shearing stress is zero on two planes, then the angle between the two planes is________________?
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A. 225

B. 135

C. 90

D. 45

19. Quick sand is a________________?
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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

20. Bishops method of stability analysis_______________?
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A. all of the above

B. neglects the effect of forces acting on the sides of the slices

C. assumes the slip surface as an arc of a circle

D. is more conservative

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