Soil Mechanics and Foundation Engineering

261. The passive earth pressure of a soil is proportional to (where φ is the angle of internal friction of the soil.)

1. tan (45° - φ)
2. tan (45° + φ)
3. tan² (45° - φ)
4. tan² (45° + φ)

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262. The phreatic line in an earth dam may be

1. Circular
2. Elliptical
3. Parabolic
4. A straight line

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263. The plasticity index is the numerical difference between

1. Liquid limit and plastic limit
2. Plastic limit and shrinkage limit
3. Liquid limit and shrinkage limit
4. None of these

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264. The plasticity of fine soils may be assessed by means of

1. Dry strength test
2. Toughness test
3. Dilatancy test
4. All of these

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265. The pressure that builds up in pore water due to load increment on the soil, is termed

1. Excess pore pressure
2. Excess hydrostatic pressure
3. Hydrodynamic pressure
4. All the above

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266. The property of a soil which allows it to be deformed rapidly without rupture, elastic rebound and also a volume change, is known

1. Porosity
2. Plasticity
3. Permeability
4. Ductility

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267. The property of a soil which permits water to percolate through it, is called

1. Moisture content
2. Permeability
3. Capillarity
4. None of these

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268. The quantity of seepage of water through soils is proportional to

1. Coefficient of permeability of soil
2. Total head loss through the soil
3. Neither (a) nor (b)
4. Both (a) and (b)

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269. The ratio of e_max and e_min of silty sand, is

1. 2
2. 2.5
3. 3
4. 3.5

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270. The ratio of settlement at any time 't' to the final settlement, is known as

1. Co-efficient of consolidation
2. Degree of consolidation
3. Consolidation index
4. Consolidation of undisturbed soil

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