Top Questions on Soil Mechanics and Foundation Engineering - Civil Engineering Questions and Answers - Section 1-C

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Top Questions on Soil Mechanics and Foundation Engineering

21. The effect of cohesion on a soil is to:

A) Reduce both the active earth pressure intensity and passive earth pressure intensity
B) Increase both the active earth pressure intensity and passive earth pressure intensity
C) Reduce the active earth pressure intensity but to increase the passive earth pressure intensity
D) Increase the active earth pressure intensity but to reduce the passive earth pressure intensity

... Answer : C)
Explanation : Reduce the active earth pressure intensity but to increase the passive earth pressure intensity

22. A retaining wall 6m high supports backfill with a surcharge angle of 10o. The back of the wall is inclined to the vertical at a positive batter angle of 5o. If the angle of wall friction is 7o, then the resultant active earth pressure will act at a distance of 2m above the base and inclined to the horizontal at an angle of

A) 7°
B) 10°
C) 12°
D) 17°

... Answer : C)
Explanation : 12°

23. Coefficient of earth pressure at rest is

A) Less than active earth pressure but greater than passive earth pressure
B) Greater than active earth pressure but less than passive earth pressure
C) Greater than both the active earth pressure and passive earth pressure
D) Less than both the active and passive earth pressures

... Answer : B)
Explanation : Greater than active earth pressure but less than passive earth pressure

24. According to Terzaghi’s theory, the ultimate bearing capacity at ground surface for a purely cohesive soil and for smooth base of a strip footing is: where C = unit cohesion of soil

A) 2.57 C
B) 5.14 C
C) 5.7 C
D) 6.2 C

... Answer : B)
Explanation : 5.14 C

25. Cohesive soils are

A) Good for back-fill because of low lateral pressure
B) Good for back-fill because of high shear strength
C) Poor for back-fill because of large lateral pressure
D) None of the above

... Answer : C)
Explanation : Poor for back-fill because of large lateral pressure

26. Which of the following earth pressure theories is directly applicable to bulkheads?

A) Rankine’s theory
B) Coulomb’s theory
C) Both
D) None of the above

... Answer : D)
Explanation : None of the above

27. For a base failure, the depth factor (Df) is:

A) Zero
B) 1
C) 0<Df<1
D) Df >1

... Answer : D)
Explanation : Df >1

28. Base failure of a finite slope:

A) Occurs when soil below the level of toe is strong
B) Occurs when there is a relatively weak zone in upper of the slope
C) Occurs when the soil below the toe is relatively soft and weak
D) Is a most common failure and occurs in relatively steep slopes

... Answer : C)
Explanation : Occurs when the soil below the toe is relatively soft and weak

29. Bishop’s method of stability analysis:

A) Is more conservative
B) Neglects the effect of forces acting of the sides of the slices
C) Assumes the slip surface as an arc of a circle
D) All of the above

... Answer : C)
Explanation : Assumes the slip surface as an arc of a circle

30. Allowable bearing pressure for a foundation depends upon

A) Allowable settlement only
B) Ultimate bearing capacity of soil only
C) Both allowable settlement and ultimate bearing capacity
D) None of above

... Answer : C)
Explanation : Both allowable settlement and ultimate bearing capacity

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