Geotechnical Engineering MCQs Set-3

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1. Effective stress on soil

decreases voids ratio and increases permeability

increases both voids ratio and permeability

decreases both voids ratio and permeability

increases voids ratio and decreases permeability

2. Bishop's method of stability analysis

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

assumes the slip surface as an arc of a circle

is more conservative

all of these

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

edge to edge orientation

all of these

face to face or parallel orientation

edge to face orientation

4. Quick sand is a

flow condition occurring in cohesive soils

flow condition occurring in cohesionless soils

flow condition occurring in both cohesive and cohesionless soils

type of sand

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

one phase system

two phase system with soil and air

two phase system with soil and water

three phase system

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

0.5 and 1.0

0.0 and 1.0

1.0 and 0.0

1.0 and 0.5

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

pore water pressure with depth

effective stress with depth

pore water pressure with time

effective stress with time

8. A combined footing is generally used when

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

there is only one column

number of columns is two and they are spaced far apart

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

9. 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

10. Negative skin friction on a pile

acts downward and increases the load carrying capacity of the pile

acts upward and reduces 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

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11. Water content of soil can

never be greater than 100%

take values only from 0% to 100%

be greater than 100%

be less than 0%

12. Effective stress is

a physical parameter that can be measured

the stress at particles contact

all of these

important because it is a function of engineering properties of soil

13. Allowable bearing pressure for a foundation depends on

ultimate bearing capacity of soil only

allowable settlement only

none of these

both allowable settlement and ultimate bearing capacity

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

equal to atmospheric pressure

none of these

greater than atmospheric pressure

less than atmospheric pressure

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

between 0 and 1

zero

greater than 1

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

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

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

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

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

remains unchanged

decreases

first increases and then decreases

increases

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

4.75 mm to 2.00 mm

0.075 mm to 0.002 mm

0.425 mm to 0.075 mm

2.00 mm to 0.425 mm

19. Void ratio of a soil mass can

take values between 0 and 1 only

be zero

take any value greater than zero

never be greater than unity

20. Physical properties of a permeant which influence permeability are

unit weight only

both viscosity and unit weight

viscosity only

none of these

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

alcohol method

calcium carbide method

sand bath method

oven drying method

22. Compressibility of sandy soils is

much less than that of clayey soils

much greater than that of clayey soils

almost equal to that of clayey soils

none of these

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

decrease in liquid limit and increase in plasticity index

decrease in both liquid limit and plasticity index

decrease in liquid limit and no change in plasticity index

increase in both liquid limit and plasticity index

24. 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

greater than active earth pressure but less than passive earth pressure

less than active pressure but greater than passive earth pressure

25. Coefficient of consolidation for clays normally

remains constant at all liquid limits

increases with increase in liquid limit

first increases and then decreases with increase in liquid limit

decreases with increase in liquid limit

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

clay

gravel

sand

silt

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

0.036

0.028

0.28

0.36

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

calcium carbide method

sand bath method

pycnometer method

oven drying method

29. Rise of water table above the ground surface causes

increase in pore water pressure but decrease in total stress

decrease in pore water pressure but increase in total stress

equal decrease in pore water pressure and total stress

equal increase in pore water pressure and total stress

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

horizontal permeability test

falling head method

constant head method

none of these

Geotechnical Engineering MCQs Set-3

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