Geotechnical Engineering MCQs Set-3

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1. 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

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

gravel

silt

sand

clay

3. A combined footing is generally used when

number of columns is two and they are spaced far apart

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

there is only one column

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

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

0.28

0.028

0.036

0.36

5. Quick sand is a

flow condition occurring in both cohesive and cohesionless soils

type of sand

flow condition occurring in cohesive soils

flow condition occurring in cohesionless soils

6. Rise of water table above the ground surface causes

increase in pore water pressure but decrease in total stress

equal decrease in pore water pressure and total stress

equal increase in pore water pressure and total stress

decrease in pore water pressure but increase in total stress

7. 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

1.0 and 0.5

0.0 and 1.0

1.0 and 0.0

8. 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

9. Bishop's method of stability analysis

all of these

is more conservative

assumes the slip surface as an arc of a circle

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

10. Allowable bearing pressure for a foundation depends on

allowable settlement only

ultimate bearing capacity of soil only

none of these

both allowable settlement and ultimate bearing capacity

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11. Effective stress is

important because it is a function of engineering properties of soil

all of these

the stress at particles contact

a physical parameter that can be measured

12. Water content of soil can

take values only from 0% to 100%

be less than 0%

never be greater than 100%

be greater than 100%

13. Coefficient of consolidation for clays normally

increases with increase in liquid limit

remains constant at all liquid limits

decreases with increase in liquid limit

first increases and then decreases with increase in liquid limit

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

constant head method

horizontal permeability test

falling head method

none of these

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

between 0 and 1

greater than 1

zero

16. Void ratio of a soil mass can

take any value greater than zero

never be greater than unity

be zero

take values between 0 and 1 only

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

pore water pressure with time

effective stress with time

pore water pressure with depth

effective stress with depth

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

first increases and then decreases

increases

remains unchanged

decreases

19. Coefficient of earth pressure at rest is

greater than both the active pressure and passive earth pressure

greater than active earth pressure but less than passive earth pressure

less than active pressure but greater than passive earth pressure

less than both the active and passive earth pressures

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

greater than atmospheric pressure

none of these

less than atmospheric pressure

equal to atmospheric pressure

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

all of these

edge to edge orientation

edge to face orientation

face to face or parallel orientation

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

three phase system

two phase system with soil and water

two phase system with soil and air

one phase system

23. 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 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

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

0.425 mm to 0.075 mm

2.00 mm to 0.425 mm

4.75 mm to 2.00 mm

0.075 mm to 0.002 mm

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

sand bath method

pycnometer method

calcium carbide method

oven drying method

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

greater than 1

between 0 and 1

zero

28. Compressibility of sandy soils is

almost equal to that of clayey soils

none of these

much less than that of clayey soils

much greater than that of clayey soils

29. Physical properties of a permeant which influence permeability are

unit weight only

viscosity only

none of these

both viscosity and unit weight

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

alcohol method

oven drying method

sand bath method

calcium carbide method

Geotechnical Engineering MCQs Set-3

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