Geotechnical Engineering MCQs Set-2

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

uniformity coefficient

none of these

effective size

coefficient of curvature

2. Degree of consolidation is

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

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 drainage path

3. At liquid limit, all soils possess

same shear strength of large magnitude

different shear strengths of large magnitude

same shear strength of small magnitude

different shear strengths of small magnitude

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

sand

clayey silt

clay

silt

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

negative

1

zero

non-plastic (NP)

6. Phreatic line in an earthen dam is

parabolic

elliptical

straight line

circular

7. 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

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

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

8. Cohesive soils are

good for backfill because of low lateral pressure

none of these

good for backfill because of high shear strength

poor for backfill because of large lateral pressure

9. 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

10. A pycnometer is used to determine

water content and voids ratio

specific gravity and dry density

voids ratio and dry density

water content and specific gravity

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11. The shear strength of a soil

decreases with increase in normal stress

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

12. 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

13. 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

b) falling head method

d) none of these

14. 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

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

normally consolidated clay

over-consolidated clay with a high over-consolidation ratio

under-consolidated clay

over-consolidated clay with a low over-consolidation ratio

16. 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

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

0.95

1.20

0.4

0.6

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

vacuum method

deep well system

well point system

electro-osmosis method

19. Coefficient of consolidation of a soil is affected by

compressibility

both compressibility and permeability

none of these

permeability

20. Residual soils are formed by

none of these

water

glaciers

wind

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21. Coarse grained soils are best compacted by a

sheep's foot roller

vibratory roller

rubber tyred roller

drum roller

22. Toughness index is defined as the ratio of

consistency index to liquidity index

plasticity index to consistency index

plasticity index to flow index

liquidity index to flow index

23. 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

24. Sand particles are made of

rock minerals

kaolinite

illite

montmorillonite

25. 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

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

sand

clay

silt

gravel

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

kaolinite

none of these

illite

montmorillonite

28. Inorganic soils with low compressibility are represented by

MH

SL

ML

CH

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

porosity

percentage air voids

voids ratio

air content

30. Unconfined compressive strength test is

consolidated undrained test

undrained test

drained test

consolidated drained test

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

drift

talus

dune sand

loess

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

partially saturated soil

dry soil

dehydrated soil

air entrained soil

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

3

16

9

6

34. 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

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

total stress only

effective stress only

none of these

both effective stress and total stress

36. Uniformity coefficient of a soil is

always equal to 1

equal to or less than 1

always less than 1

equal to or greater than 1

37. Coefficient of permeability of soil

increases with the decrease in temperature

none of these

increases with the increase in temperature

does not depend upon temperature

38. A fully saturated soil is said to be

three phase system

two phase system with soil and water

two phase system with soil and air

one phase system

39. Rate of consolidation

is unaffected by permeability of soil

increases with increase in temperature

increases with decrease in temperature

is independent of temperature

40. 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

semi-solid state

solid state

liquid state

Geotechnical Engineering MCQs Set-2

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