Factors affecting Permeabiltiy

Q. Consider the following statements:
1. Permeability of a soil decreases as the effective stress acting on the soil increases.
2. The presence of organic matter in the soil increases its permeability.
3. Entrapped air decreases the permeability of a soil.
Which of these statements is/are correct?

1. 1 only
2. 1 and 2
3. 2 and 3
4. 1 and 3

Q. Consider the following statements regarding permeability of soils:
1. Permeability of coarse grained soil is inversely proportional to the specific surface at a given porosity.
2. Direct measurement of permeability of a soil specimen at any stage of loading in odometer test can be made only in fixed-ring type oedometer.
3. The permeability of an aquifer increased with decreases in temperature of water moving through it.
Which of the above statements is/are correct?

1. 1 and 2
2. 1 and 3
3. 2 and 3
4. 1, 2 and 3

Q. A 800 m${}^3$/day of water drawn from a proposed infiltration gallery which is placed at 8 m depth in the bank of the river. The coefficient of permeability of soil aquifer is 100 m/day, then the length of gallery (in m) if the draw down in the gallery on pumping is not to exceed 4 m. (Take the radius of influence as 100).

1. 33.33
2. 19.81
3. 15.36
4. 39

Q. Consider the following statements:
1. Organic matter decreases the permeability of a soil.
2. Entrapped air decreases the permeability of a soil.
Which of these statements are correct?

1. 1 only
2. 2 only
3. Both 1 and 2
4. Neither 1 nor 2

Q. Consider the following statements:
1. Knowledge about moisture content is necessary to determine permeability.
2. Some typical marine clay may have moisture content as high as 400%.
3. Sand-bath method of moisture content determination is not suitable for soils containing organic matter.
Which of the above statements are correct?

1. 1, 2 and 3
2. 1 and 2 only
3. 2 and 3 only
4. 1 and 3 only

Q. Consider the following statements
The coefficient of permeability k depends upon
1. void ratio of the soil.
2. duration of flow.
3. equivalent diameter of the soil grains.
4. shape of the particle.
Which of these statements are correct?

1. 1, 2, 3 and 4
2. 2 and 3 only
3. 1, 3 and 4 only
4. 3 and 4 only

Q. Statement (I): Saturated fine, as well as medium, sands of uniform particle size are most susceptible to liquefaction.
Statement (II): Fine particles reduce the permeability which is a prime factor for liquefaction.

Directions: Each of the next items consists of two statements, one labelled as the Statement (I) and the other as Statement (II). Examine these two statements carefully and select the answers to these items using the codes given below :
Codes:

1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (11) are individually true but Statement (II) is not the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false
4. Statement (I) is false but Statement (II) is true

Q. Consider the following statements:
1. Organic matter increases the permeability of a soil.
2. Entrapped air decreases the permeability of a soil.
Which of these statements is/are correct?

1. 1 only
2. 2 only
3. Both 1 and 2
4. Neither 1 nor 2