Specific Gravity
1. Which of the following apparatus is NOT typically used for determining the specific gravity of soil?
2. Specific gravity is a dimensionless quantity.
3. The specific gravity of soil solids is used in the calculation of which of the following soil properties?
4. In the pycnometer method, the mass of the pycnometer filled with soil and water is denoted as W3. What does (W3 - W2) represent if W2 is the mass of pycnometer plus dry soil?
5. Why is distilled water preferred over tap water for specific gravity determination?
6. For which type of soil is the density bottle method more suitable than the pycnometer method?
7. For determining the specific gravity of soil solids, using a pycnometer of 500 cc, the following data is available: Weight of dry empty pycnometer (W1) = 125 g; Weight of dried soil and pycnometer (W2) = 500 g; Weight of dried soil and distilled water filled to the top of the pycnometer (W3) = 925 g. Determine the specific gravity of the soil. (Assume W4, weight of pycnometer + water = 700g)
8. A soil sample has a mass of 50g in its dry state. When placed in a pycnometer and filled with water, the total mass is 730g. The pycnometer filled with water alone weighs 700g. What is the specific gravity?
9. If a soil has G = 2.7 and a void ratio of 0.5, what is its saturated unit weight in kN/m³? (γ_w = 9.81 kN/m³)