Geotechnical Engineering MCQs Set-3

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1. Water content of soil can

be less than 0%

never be greater than 100%

be greater than 100%

take values only from 0% to 100%

2. Rise of water table above the ground surface causes

equal increase in pore water pressure and total stress

equal decrease in pore water pressure and total stress

increase in pore water pressure but decrease in total stress

decrease in pore water pressure but increase in total stress

3. According to IS classification, the range of silt size particles is

0.075 mm to 0.002 mm

4.75 mm to 2.00 mm

0.425 mm to 0.075 mm

2.00 mm to 0.425 mm

4. Which of the following methods is more suitable for the determination of permeability of clayey soil?

none of these

constant head method

falling head method

horizontal permeability test

5. Skempton's pore pressure coefficient B for saturated soil is

between 0 and 1

greater than 1

zero

6. Bishop's method of stability analysis

assumes the slip surface as an arc of a circle

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

is more conservative

all of these

7. When the degree of saturation is zero, the soil mass under consideration represents

one phase system

two phase system with soil and water

three phase system

two phase system with soil and air

8. Allowable bearing pressure for a foundation depends on

both allowable settlement and ultimate bearing capacity

allowable settlement only

none of these

ultimate bearing capacity of soil only

9. If the water table rises upto ground surface, then the

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

total stress is increased due to decrease in pore water pressure but effective stress does not change

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

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

10. Compressibility of sandy soils is

much less than that of clayey soils

none of these

almost equal to that of clayey soils

much greater than that of clayey soils

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11. Coefficient of earth pressure at rest is

greater than both the active pressure and passive earth pressure

less than both the active and passive earth pressures

less than active pressure but greater than passive earth pressure

greater than active earth pressure but less than passive earth pressure

12. The slope of isochrone at any point at a given time indicates the rate of change of

effective stress with depth

effective stress with time

pore water pressure with time

pore water pressure with depth

13. 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

0.0 and 1.0

1.0 and 0.5

1.0 and 0.0

0.5 and 1.0

14. Coefficient of consolidation for clays normally

decreases with increase in liquid limit

increases with increase in liquid limit

remains constant at all liquid limits

first increases and then decreases with increase in liquid limit

15. Which of the following methods is most accurate for the determination of the water content of soil?

sand bath method

calcium carbide method

oven drying method

pycnometer method

16. If the sand in-situ is in its densest state, then the relative density of sand is

zero

between 0 and 1

greater than 1

17. A combined footing is generally used when

number of columns is two and they are spaced far apart

there is only one column

number of columns is more than two and they are spaced far apart

number of columns is two and they are spaced close to each other

18. The value of compression index for a remoulded sample whose liquid limit is 50% is

0.28

0.36

0.028

0.036

19. In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear

decreases

remains unchanged

first increases and then decreases

increases

20. For proper field control, which of the following methods is best suited for quick determination of water content of a soil mass?

sand bath method

alcohol method

calcium carbide method

oven drying method

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21. Negative skin friction on a pile

acts downward and increases the load carrying capacity of the pile

acts upward and increases the load carrying capacity of the pile

acts downward and reduces the load carrying capacity of the pile

acts upward and reduces the load carrying capacity of the pile

22. If the permeability of a soil is 0.8 mm/sec, the type of soil is

gravel

clay

silt

sand

23. The admixture of coarser particles like sand or silt to clay causes

decrease in liquid limit and increase in plasticity index

decrease in liquid limit and no change in plasticity index

decrease in both liquid limit and plasticity index

increase in both liquid limit and plasticity index

24. The hydrostatic pressure on the phreatic line within a dam section is

greater than atmospheric pressure

less than atmospheric pressure

equal to atmospheric pressure

none of these

25. Quick sand is a

flow condition occurring in cohesive soils

flow condition occurring in both cohesive and cohesionless soils

type of sand

flow condition occurring in cohesionless soils

26. Effective stress on soil

increases both voids ratio and permeability

increases voids ratio and decreases permeability

decreases voids ratio and increases permeability

decreases both voids ratio and permeability

27. Void ratio of a soil mass can

never be greater than unity

be zero

take any value greater than zero

take values between 0 and 1 only

28. Physical properties of a permeant which influence permeability are

unit weight only

both viscosity and unit weight

none of these

viscosity only

29. Effective stress is

all of these

the stress at particles contact

a physical parameter that can be measured

important because it is a function of engineering properties of soil

30. Dispersed type of soil structure is an arrangement comprising particles having

face to face or parallel orientation

edge to edge orientation

all of these

edge to face orientation

Geotechnical Engineering MCQs Set-3

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