Geotechnical Engineering MCQs Set-2

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1. The effect of cohesion on a soil is to

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

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

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

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

a) constant head method

b) falling head method

c) both of (a) and (b)

d) none of these

3. The shear strength of a 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

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

4. 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

semi-solid state

solid state

5. Residual soils are formed by

wind

none of these

water

glaciers

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

voids ratio

porosity

air content

percentage air voids

7. Sensitivity of a soil can be defined as

none of these

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

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

clay

sand

silt

clayey silt

9. Cohesive soils are

good for backfill because of high shear strength

poor for backfill because of large lateral pressure

good for backfill because of low lateral pressure

none of these

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

gravel

silt

clay

sand

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

loess

talus

dune sand

drift

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

vertical and smooth

plane and rough

plane and smooth

vertical and rough

13. Time factor for a clay layer is

independent of thickness of clay layer

inversely proportional to drainage path

directly proportional to permeability of soil

a dimensional parameter

14. Rate of consolidation

increases with decrease in temperature

increases with increase in temperature

is independent of temperature

is unaffected by permeability of soil

15. Coarse grained soils are best compacted by a

drum roller

rubber tyred roller

sheep's foot roller

vibratory roller

16. Toughness index is defined as the ratio of

plasticity index to consistency index

consistency index to liquidity index

liquidity index to flow index

plasticity index to flow index

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

both effective stress and total stress

none of these

total stress only

effective stress only

18. 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

19. 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

20. Inorganic soils with low compressibility are represented by

MH

SL

CH

ML

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21. At liquid limit, all soils possess

same shear strength of small magnitude

different shear strengths of large magnitude

same shear strength of large magnitude

different shear strengths of small magnitude

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

zero

1

non-plastic (NP)

negative

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

dehydrated soil

dry soil

air entrained soil

partially saturated soil

24. A pycnometer is used to determine

specific gravity and dry density

water content and specific gravity

voids ratio and dry density

water content and voids ratio

25. Phreatic line in an earthen dam is

straight line

circular

elliptical

parabolic

26. 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

27. Uniformity coefficient of a soil is

always equal to 1

always less than 1

equal to or less than 1

equal to or greater than 1

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

uniformity coefficient

effective size

none of these

coefficient of curvature

29. Sand particles are made of

montmorillonite

kaolinite

rock minerals

illite

30. 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

greater than specific gravity of soil

equal to specific gravity of soil

independent of specific gravity of soil

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

over-consolidated clay with a high over-consolidation ratio

over-consolidated clay with a low over-consolidation ratio

under-consolidated clay

normally consolidated clay

32. Coefficient of consolidation of a soil is affected by

compressibility

none of these

permeability

both compressibility and permeability

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

kaolinite

montmorillonite

illite

none of these

34. A fully saturated soil is said to be

two phase system with soil and air

three phase system

two phase system with soil and water

one phase system

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

6

16

9

3

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

well point system

vacuum method

deep well system

electro-osmosis method

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

1.20

0.95

0.4

0.6

38. Unconfined compressive strength test is

undrained test

consolidated undrained test

consolidated drained test

drained test

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

all of these

less than 0.0002 mm

greater than 0.2 mm

between 0.2 mm and 0.0002 mm

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

shrinkage limit

plasticity index

liquid limit

plastic limit

Geotechnical Engineering MCQs Set-2

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