Geotechnical Engineering MCQs Set-2

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1. Which of the following types of soil is transported by gravitational forces?

loess

talus

dune sand

drift

2. The water content of soil, which represents the boundary between plastic state and liquid state is known as

shrinkage limit

liquid limit

plasticity index

plastic limit

3. Toughness index is defined as the ratio of

plasticity index to flow index

liquidity index to flow index

consistency index to liquidity index

plasticity index to consistency index

4. Sensitivity of a soil can be defined as

ratio of volume of voids to volume of solids

percentage of volume change of soil under saturated condition

none of these

ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state

5. Phreatic line in an earthen dam is

elliptical

circular

parabolic

straight line

6. Highway Research Board (HRB) classification of soils is based on

plasticity characteristics

both particle size composition and plasticity characteristics

particle size composition

none of these

7. Cohesive soils are

poor for backfill because of large lateral pressure

good for backfill because of high shear strength

good for backfill because of low lateral pressure

none of these

8. Degree of consolidation is

directly proportional to drainage path and inversely proportional to time

directly proportional to time and inversely proportional to square of drainage path

directly proportional to time and inversely proportional to drainage path

directly proportional to square of drainage path and inversely proportional to time

9. A pycnometer is used to determine

specific gravity and dry density

voids ratio and dry density

water content and voids ratio

water content and specific gravity

10. Coefficient of permeability of soil

none of these

increases with the increase in temperature

increases with the decrease in temperature

does not depend upon temperature

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11. Coarse grained soils are best compacted by a

rubber tyred roller

sheep's foot roller

drum roller

vibratory roller

12. Residual soils are formed by

wind

water

none of these

glaciers

13. The ratio of volume of voids to the total volume of soil mass is called

porosity

air content

voids ratio

percentage air voids

14. The clay mineral with the largest swelling and shrinkage characteristics

none of these

montmorillonite

illite

kaolinite

15. Stoke's law is valid only if the size of particle is

all of these

greater than 0.2 mm

less than 0.0002 mm

between 0.2 mm and 0.0002 mm

16. Time factor for a clay layer is

independent of thickness of clay layer

inversely proportional to drainage path

a dimensional parameter

directly proportional to permeability of soil

17. Total number of stress components at a point within a soil mass loaded at its boundary is

16

3

6

9

18. The effect of cohesion on a soil is to

increase both the active earth pressure intensity and passive earth pressure intensity

reduce both the active earth pressure intensity and passive earth pressure intensity

increase the active earth pressure intensity but to reduce the passive earth pressure intensity

reduce the active earth pressure intensity but to increase the passive earth pressure intensity

19. When the plastic limit of a soil is greater than the liquid limit, then the plasticity index is reported as

non-plastic (NP)

zero

negative

1

20. Uniformity coefficient of a soil is

equal to or greater than 1

equal to or less than 1

always less than 1

always equal to 1

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21. The shear strength of a soil

is inversely proportional to the angle of internal friction of the soil

is directly proportional to the angle of internal friction of the soil

decreases with increase in normal stress

decreases with decrease in normal stress

22. If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in

semi-solid state

plastic state

solid state

liquid state

23. Which of the following is a measure of particle size range?

effective size

none of these

uniformity coefficient

coefficient of curvature

24. Inorganic soils with low compressibility are represented by

CH

MH

SL

ML

25. Relative density of a compacted dense sand is approximately equal to

0.95

0.4

0.6

1.20

26. Unconfined compressive strength test is

consolidated drained test

consolidated undrained test

undrained test

drained test

27. Which of the following methods is best suited for determination of permeability of coarse-grained soils?

a) constant head method

d) none of these

b) falling head method

c) both of (a) and (b)

28. A fully saturated soil is said to be

two phase system with soil and air

one phase system

two phase system with soil and water

three phase system

29. If the plasticity index of a soil mass is zero, the soil is

silt

sand

clay

clayey silt

30. Shear strength of a soil is a unique function of

none of these

total stress only

effective stress only

both effective stress and total stress

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31. Which of the following soils has more plasticity index?

silt

gravel

clay

sand

32. Coefficient of consolidation of a soil is affected by

both compressibility and permeability

compressibility

none of these

permeability

33. Sand particles are made of

rock minerals

illite

kaolinite

montmorillonite

34. If the voids of a soil mass are full of air only, the soil is termed as

dehydrated soil

air entrained soil

dry soil

partially saturated soil

35. The most suitable method for drainage of fine grained cohesive soils is

well point system

electro-osmosis method

deep well system

vacuum method

36. Which one of the following clays behaves like a dense sand?

under-consolidated clay

over-consolidated clay with a high over-consolidation ratio

over-consolidated clay with a low over-consolidation ratio

normally consolidated clay

37. At liquid limit, all soils possess

same shear strength of large magnitude

different shear strengths of small magnitude

same shear strength of small magnitude

different shear strengths of large magnitude

38. Rate of consolidation

is unaffected by permeability of soil

is independent of temperature

increases with decrease in temperature

increases with increase in temperature

39. Rankine's theory of earth pressure assumes that the back of the wall is

plane and rough

vertical and rough

plane and smooth

vertical and smooth

40. If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is

equal to specific gravity of soil

independent of specific gravity of soil

greater than specific gravity of soil

less than specific gravity of soil

Geotechnical Engineering MCQs Set-2

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