Soil Mechanics and Foundation Engineering

281. The relationship between void ratio (e) and porosity ratio (n) is:

1. n = (1 + e )/(1 - e)
2. e = (1 + n)/(1 - e)
3. n = e/(1 - e)
4. e = n/(1 - n)

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282. The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing

1. Cohesion and effective angle of shearing resistance
2. Cohesion and effective unit weight of soil
3. Effective unit weight of soil and effective angle of shearing resistance
4. Effective angle of shearing resistance

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283. The seepage exit gradient in a soil is the ratio of

1. Total head to the length of seepage
2. Flow line to slope
3. Head upstream to that at downstream
4. Head loss to the length of the seepage

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284. The seepage force in a soil, is

1. Perpendicular to the equipotential lines
2. Proportional to the exit gradient
3. Proportional to the head loss
4. All the above

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285. The shear resistance of a soil is constituted basically of the following component.

1. The frictional resistance to translocation between the individual soil particles at their contact point
2. To the structural relation to displacement of the soil because of the interlocking of the particles
3. Cohesion and adhesion between the surfaces of the soil particles
4. All the above

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286. The shear strength in plastic undrained clay, is due to

1. Inter-granular friction
2. Internal friction
3. Cohesion
4. None of these

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287. The shear strength of a soil

1. Is directly proportional to the angle of internal friction of the soil
2. Is inversely proportional to the angle of internal friction of the soil
3. Decreases with increase in normal stress
4. Decreases with decrease in normal stress

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288. The shearing force acting along the slice of a curved surface of slippage, causes the soil to slide

1. Down at the centre
2. Down at the toe
3. Upward at the centre
4. None of these

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289. The shearing strength of a cohesion-less soil depends upon

1. Dry density
2. Rate of loading
3. Confining pressure
4. Nature of loading

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290. You are given a sample of soil containing coarse grains to determine its water content, you will use

1. Pycnometer
2. Oven-drying method
3. Calcium carbide method
4. Alcohol method

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