Geotechnical Engineering MCQs Set-3

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1. 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

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

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

2. Water content of soil can

be less than 0%

take values only from 0% to 100%

never be greater than 100%

be greater than 100%

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

2.00 mm to 0.425 mm

0.425 mm to 0.075 mm

4.75 mm to 2.00 mm

0.075 mm to 0.002 mm

4. Coefficient of earth pressure at rest is

greater than active earth pressure but less than passive earth pressure

less than active pressure but greater than passive earth pressure

greater than both the active pressure and passive earth pressure

less than both the active and passive earth pressures

5. Effective stress is

a physical parameter that can be measured

important because it is a function of engineering properties of soil

the stress at particles contact

all of these

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

zero

greater than 1

between 0 and 1

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

between 0 and 1

zero

greater than 1

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

effective stress with time

effective stress with depth

pore water pressure with time

pore water pressure with depth

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

sand bath method

oven drying method

calcium carbide method

pycnometer method

10. A combined footing is generally used when

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

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

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11. Quick sand is a

type of sand

flow condition occurring in cohesive soils

flow condition occurring in both cohesive and cohesionless soils

flow condition occurring in cohesionless soils

12. 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 increase in pore water pressure and total stress

equal decrease in pore water pressure and total stress

13. 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

increase in both liquid limit and plasticity index

decrease in both liquid limit and plasticity index

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

constant head method

falling head method

horizontal permeability test

none of these

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

0.36

0.28

0.036

0.028

16. Effective stress on soil

increases both voids ratio and permeability

decreases voids ratio and increases permeability

decreases both voids ratio and permeability

increases voids ratio and decreases permeability

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

three phase system

two phase system with soil and air

one phase system

two phase system with soil and water

18. 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

1.0 and 0.0

1.0 and 0.5

0.5 and 1.0

0.0 and 1.0

19. Physical properties of a permeant which influence permeability are

none of these

unit weight only

both viscosity and unit weight

viscosity only

20. Allowable bearing pressure for a foundation depends on

ultimate bearing capacity of soil only

allowable settlement only

both allowable settlement and ultimate bearing capacity

none of these

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21. Bishop's method of stability analysis

is more conservative

all of these

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

assumes the slip surface as an arc of a circle

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

oven drying method

alcohol method

calcium carbide method

sand bath method

23. Negative skin friction on a pile

acts upward and increases the load carrying capacity of the pile

acts downward and reduces the load carrying capacity of the pile

acts downward and increases the load carrying capacity of the pile

acts upward and reduces the load carrying capacity of the pile

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

sand

silt

gravel

clay

25. Coefficient of consolidation for clays normally

first increases and then decreases with increase in liquid limit

increases with increase in liquid limit

decreases with increase in liquid limit

remains constant at all liquid limits

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

face to face or parallel orientation

all of these

edge to edge orientation

edge to face orientation

27. 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

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

decreases

first increases and then decreases

increases

remains unchanged

29. Void ratio of a soil mass can

be zero

never be greater than unity

take values between 0 and 1 only

take any value greater than zero

30. Compressibility of sandy soils is

none of these

much less than that of clayey soils

almost equal to that of clayey soils

much greater than that of clayey soils

Geotechnical Engineering MCQs Set-3

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