Geotechnical Engineering MCQs Set-2

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1. Uniformity coefficient of a soil is

always less than 1

equal to or less than 1

always equal to 1

equal to or greater than 1

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

over-consolidated clay with a low over-consolidation ratio

normally consolidated clay

over-consolidated clay with a high over-consolidation ratio

under-consolidated clay

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

negative

zero

non-plastic (NP)

1

4. The shear strength of a soil

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

decreases with increase in normal stress

decreases with decrease in normal stress

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

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

clay

clayey silt

silt

sand

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

0.6

0.4

1.20

0.95

7. 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

less than specific gravity of soil

independent of specific gravity of soil

greater than specific gravity of soil

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

vacuum method

well point system

deep well system

electro-osmosis method

9. Coarse grained soils are best compacted by a

drum roller

sheep's foot roller

vibratory roller

rubber tyred roller

10. Inorganic soils with low compressibility are represented by

MH

SL

CH

ML

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11. The effect of cohesion on a soil is to

reduce 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

increase 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

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

both particle size composition and plasticity characteristics

plasticity characteristics

none of these

particle size composition

13. A fully saturated soil is said to be

three phase system

two phase system with soil and air

two phase system with soil and water

one phase system

14. A pycnometer is used to determine

specific gravity and dry density

water content and voids ratio

water content and specific gravity

voids ratio and dry density

15. Coefficient of permeability of soil

does not depend upon temperature

increases with the increase in temperature

increases with the decrease in temperature

none of these

16. Phreatic line in an earthen dam is

straight line

elliptical

circular

parabolic

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

uniformity coefficient

none of these

coefficient of curvature

effective size

18. Degree of consolidation is

directly proportional to time and inversely proportional to drainage path

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 drainage path and inversely proportional to time

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

total stress only

both effective stress and total stress

none of these

effective stress only

20. Sand particles are made of

montmorillonite

rock minerals

kaolinite

illite

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

talus

dune sand

loess

drift

22. Residual soils are formed by

water

none of these

glaciers

wind

23. Sensitivity of a soil can be defined as

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

none of these

ratio of volume of voids to volume of solids

24. Time factor for a clay layer is

directly proportional to permeability of soil

inversely proportional to drainage path

a dimensional parameter

independent of thickness of clay layer

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

c) both of (a) and (b)

a) constant head method

d) none of these

b) falling head method

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

percentage air voids

voids ratio

air content

porosity

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

none of these

kaolinite

montmorillonite

illite

28. At liquid limit, all soils possess

same shear strength of small magnitude

different shear strengths of small magnitude

different shear strengths of large magnitude

same shear strength of large magnitude

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

liquid limit

plastic limit

plasticity index

shrinkage limit

30. Rate of consolidation

is independent of temperature

is unaffected by permeability of soil

increases with increase in temperature

increases with decrease in temperature

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31. 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

liquid state

solid state

semi-solid state

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

3

16

6

9

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

clay

silt

gravel

sand

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

plane and smooth

vertical and rough

vertical and smooth

plane and rough

35. Coefficient of consolidation of a soil is affected by

none of these

both compressibility and permeability

compressibility

permeability

36. Toughness index is defined as the ratio of

consistency index to liquidity index

plasticity index to consistency index

liquidity index to flow index

plasticity index to flow index

37. 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

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

air entrained soil

partially saturated soil

dehydrated soil

dry soil

39. Cohesive soils are

good for backfill because of high shear strength

none of these

poor for backfill because of large lateral pressure

good for backfill because of low lateral pressure

40. Unconfined compressive strength test is

drained test

consolidated undrained test

undrained test

consolidated drained test

Geotechnical Engineering MCQs Set-2

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