Geotechnical Engineering MCQs Set-2

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

both particle size composition and plasticity characteristics

none of these

particle size composition

plasticity characteristics

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

illite

none of these

montmorillonite

kaolinite

3. 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

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

coefficient of curvature

effective size

none of these

uniformity coefficient

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

plasticity index

plastic limit

shrinkage limit

liquid limit

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

0.95

0.6

0.4

1.20

7. Phreatic line in an earthen dam is

straight line

elliptical

circular

parabolic

8. 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

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

none of these

9. Coefficient of permeability of soil

none of these

increases with the decrease in temperature

does not depend upon temperature

increases with the increase in temperature

10. Coefficient of consolidation of a soil is affected by

permeability

both compressibility and permeability

none of these

compressibility

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

percentage air voids

porosity

air content

voids ratio

12. A pycnometer is used to determine

water content and voids ratio

water content and specific gravity

specific gravity and dry density

voids ratio and dry density

13. Unconfined compressive strength test is

drained test

consolidated drained test

consolidated undrained test

undrained test

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

air entrained soil

dehydrated soil

dry soil

partially saturated soil

15. A fully saturated soil is said to be

one phase system

three phase system

two phase system with soil and air

two phase system with soil and water

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

silt

sand

gravel

clay

17. Residual soils are formed by

glaciers

none of these

water

wind

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

solid state

semi-solid state

liquid state

plastic state

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

between 0.2 mm and 0.0002 mm

less than 0.0002 mm

all of these

greater than 0.2 mm

20. Inorganic soils with low compressibility are represented by

SL

CH

ML

MH

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21. Sand particles are made of

rock minerals

kaolinite

illite

montmorillonite

22. The shear strength of a soil

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

decreases with decrease in normal stress

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

decreases with increase in normal stress

23. Uniformity coefficient of a soil is

always less than 1

equal to or less than 1

equal to or greater than 1

always equal to 1

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

well point system

vacuum method

deep well system

electro-osmosis method

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

drift

dune sand

talus

loess

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

vertical and rough

vertical and smooth

plane and rough

plane and smooth

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

a) constant head method

c) both of (a) and (b)

d) none of these

b) falling head method

28. 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

29. Cohesive soils are

poor for backfill because of large lateral pressure

none of these

good for backfill because of high shear strength

good for backfill because of low lateral pressure

30. The effect of cohesion on a soil is to

reduce the active earth pressure intensity but to increase the 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

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

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

under-consolidated clay

normally consolidated clay

over-consolidated clay with a low over-consolidation ratio

over-consolidated clay with a high over-consolidation ratio

32. Coarse grained soils are best compacted by a

sheep's foot roller

drum roller

vibratory roller

rubber tyred roller

33. Time factor for a clay layer is

inversely proportional to drainage path

directly proportional to permeability of soil

independent of thickness of clay layer

a dimensional parameter

34. Degree of consolidation is

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

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

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

6

16

9

3

36. At liquid limit, all soils possess

different shear strengths of small magnitude

same shear strength of small magnitude

same shear strength of large magnitude

different shear strengths of large magnitude

37. Rate of consolidation

is independent of temperature

increases with increase in temperature

is unaffected by permeability of soil

increases with decrease in temperature

38. Toughness index is defined as the ratio of

plasticity index to consistency index

consistency index to liquidity index

plasticity index to flow index

liquidity index to flow index

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

clayey silt

sand

clay

silt

40. 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

Geotechnical Engineering MCQs Set-2

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