Geotechnical Engineering MCQs Set-2

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

under-consolidated clay

over-consolidated clay with a low over-consolidation ratio

over-consolidated clay with a high over-consolidation ratio

normally consolidated clay

2. At liquid limit, all soils possess

different shear strengths of large magnitude

same shear strength of large magnitude

different shear strengths of small magnitude

same shear strength of small magnitude

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

plane and rough

vertical and smooth

vertical and rough

plane and smooth

4. Inorganic soils with low compressibility are represented by

SL

MH

CH

ML

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

sand

clayey silt

silt

clay

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

plastic state

solid state

semi-solid state

liquid state

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

plastic limit

shrinkage limit

plasticity index

liquid limit

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

none of these

illite

kaolinite

montmorillonite

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

well point system

deep well system

vacuum method

electro-osmosis method

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

porosity

air content

percentage air voids

voids ratio

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11. 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

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

both particle size composition and plasticity characteristics

particle size composition

none of these

plasticity characteristics

13. Coarse grained soils are best compacted by a

rubber tyred roller

sheep's foot roller

drum roller

vibratory roller

14. Phreatic line in an earthen dam is

straight line

circular

parabolic

elliptical

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

effective stress only

total stress only

none of these

both effective stress and total stress

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

silt

clay

sand

gravel

17. Cohesive soils are

good for backfill because of high shear strength

good for backfill because of low lateral pressure

poor for backfill because of large lateral pressure

none of these

18. Unconfined compressive strength test is

consolidated undrained test

undrained test

drained test

consolidated drained test

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

uniformity coefficient

effective size

coefficient of curvature

none of these

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

talus

dune sand

loess

drift

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21. 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

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

less than 0.0002 mm

between 0.2 mm and 0.0002 mm

all of these

greater than 0.2 mm

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

16

3

9

6

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

1

non-plastic (NP)

zero

negative

25. Rate of consolidation

is unaffected by permeability of soil

is independent of temperature

increases with increase in temperature

increases with decrease in temperature

26. Sensitivity of a soil can be defined as

ratio of volume of voids to volume of solids

none of these

percentage of volume change of soil under saturated condition

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

27. Degree of consolidation is

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

directly proportional to drainage path and inversely proportional to time

directly proportional to time and inversely proportional to drainage path

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

28. Uniformity coefficient of a soil is

equal to or less than 1

always less than 1

always equal to 1

equal to or greater than 1

29. Residual soils are formed by

water

none of these

wind

glaciers

30. Toughness index is defined as the ratio of

plasticity index to flow index

consistency index to liquidity index

plasticity index to consistency index

liquidity index to flow index

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31. 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

32. A pycnometer is used to determine

specific gravity and dry density

voids ratio and dry density

water content and specific gravity

water content and voids ratio

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

0.95

1.20

0.4

0.6

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

less than specific gravity of soil

independent of specific gravity of soil

greater than specific gravity of soil

equal to specific gravity of soil

35. Coefficient of consolidation of a soil is affected by

compressibility

permeability

none of these

both compressibility and permeability

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. A fully saturated soil is said to be

three phase system

one phase system

two phase system with soil and air

two phase system with soil and water

38. 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

39. Sand particles are made of

illite

rock minerals

kaolinite

montmorillonite

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

c) both of (a) and (b)

d) none of these

a) constant head method

b) falling head method

Geotechnical Engineering MCQs Set-2

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