Geotechnical Engineering MCQs Set-3

1. 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 0.0

1.0 and 0.5

0.0 and 1.0

2. 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

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

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

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

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

none of these

equal to atmospheric pressure

less than atmospheric pressure

greater than atmospheric pressure

5. Compressibility of sandy soils is

none of these

much greater than that of clayey soils

much less than that of clayey soils

almost equal to that of clayey soils

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

decrease in both liquid limit and plasticity index

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

7. 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

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

0.036

0.36

0.28

0.028

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

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

number of columns is two and they are spaced far apart

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

there is only one column

Geotechnical Engineering MCQs Set-3

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