Question

Consider the following statements:
1. Constant head permeameter is best suited for determination of coefficient of permeability of highly impermeable soils.
2. Coefficient of permeability of a soil mass decreases with an increase in viscosity of the pore fluid.
3. Coefficient of permeability of a soil mass increases with an increase in temperature of the fluid.
Of these statements:

• A. 1 and 2 are correct
• B. 1 and 3 are correct
• C. 2 and 3 are correct
• D. 1, 2 and 3 are correct

Hint:

- Constant Head Permeameter is used for permeable soils, and Falling Head Permeameter for impermeable soils. - Permeability increases with temperature and decreases with viscosity.

Answer 1

The Correct Option is C

Step 1: Understanding the permeability measurement. - The Constant Head Permeameter is best suited for highly permeable soils (e.g., sand) and not for impermeable soils like clay. - Falling Head Permeameter is preferred for impermeable soils. 
Step 2: Effect of Viscosity on Permeability. - Permeability decreases as the viscosity of the pore fluid increases, since fluid movement is hindered. 
Step 3: Effect of Temperature on Permeability. - Higher temperature reduces viscosity, which increases permeability. Thus, statements 2 and 3 are correct, but statement 1 is incorrect, making option (C) 2 and 3 are correct the right choice.