Geotechnical Engineering MCQs Set-2

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

both effective stress and total stress

effective stress only

total stress only

none of these

2. Cohesive soils are

poor for backfill because of large lateral pressure

good for backfill because of high shear strength

none of these

good for backfill because of low lateral pressure

3. Phreatic line in an earthen dam is

parabolic

straight line

elliptical

circular

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

shrinkage limit

liquid limit

plastic limit

plasticity index

5. Uniformity coefficient of a soil is

always less than 1

equal to or greater than 1

equal to or less than 1

always equal to 1

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

particle size composition

none of these

plasticity characteristics

both particle size composition and plasticity characteristics

7. Coefficient of consolidation of a soil is affected by

both compressibility and permeability

none of these

permeability

compressibility

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

non-plastic (NP)

negative

zero

1

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

drift

loess

dune sand

talus

10. Rate of consolidation

is independent of temperature

is unaffected by permeability of soil

increases with decrease in temperature

increases with increase in temperature

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11. The shear strength of a soil

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

decreases with decrease in normal stress

decreases with increase in normal stress

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

12. Coarse grained soils are best compacted by a

vibratory roller

sheep's foot roller

drum roller

rubber tyred roller

13. The effect of cohesion on a soil is to

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

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

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

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

14. Toughness index is defined as the ratio of

consistency index to liquidity index

plasticity index to flow index

plasticity index to consistency index

liquidity index to flow index

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

all of these

between 0.2 mm and 0.0002 mm

less than 0.0002 mm

greater than 0.2 mm

16. Sand particles are made of

kaolinite

illite

rock minerals

montmorillonite

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

independent of specific gravity of soil

less than specific gravity of soil

equal to specific gravity of soil

greater than specific gravity of soil

18. Unconfined compressive strength test is

undrained test

consolidated drained test

consolidated undrained test

drained test

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

air content

voids ratio

porosity

percentage air voids

20. Inorganic soils with low compressibility are represented by

CH

SL

ML

MH

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

0.4

1.20

0.95

0.6

22. At liquid limit, all soils possess

same shear strength of small magnitude

different shear strengths of large magnitude

different shear strengths of small magnitude

same shear strength of large magnitude

23. A pycnometer is used to determine

water content and voids ratio

voids ratio and dry density

specific gravity and dry density

water content and specific gravity

24. Sensitivity of a soil can be defined as

none of these

percentage of volume change of soil under saturated condition

ratio of volume of voids to volume of solids

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

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

coefficient of curvature

uniformity coefficient

effective size

none of these

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

montmorillonite

illite

none of these

kaolinite

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

sand

clayey silt

clay

silt

28. Degree of consolidation is

directly proportional to drainage path and inversely proportional to time

directly proportional to square of 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

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

deep well system

vacuum method

electro-osmosis method

well point system

30. Residual soils are formed by

water

wind

none of these

glaciers

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

sand

silt

clay

gravel

32. Time factor for a clay layer is

independent of thickness of clay layer

directly proportional to permeability of soil

inversely proportional to drainage path

a dimensional parameter

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

plane and smooth

plane and rough

vertical and rough

vertical and smooth

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

9

3

6

16

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

dry soil

dehydrated soil

partially saturated soil

air entrained soil

36. Coefficient of permeability of soil

increases with the decrease in temperature

increases with the increase in temperature

none of these

does not depend upon temperature

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

c) both of (a) and (b)

b) falling head method

d) none of these

a) constant head method

38. 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

solid state

plastic state

liquid state

39. A fully saturated soil is said to be

two phase system with soil and water

one phase system

two phase system with soil and air

three phase system

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

under-consolidated clay

over-consolidated clay with a low over-consolidation ratio

normally consolidated clay

over-consolidated clay with a high over-consolidation ratio

Geotechnical Engineering MCQs Set-2

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