Geotechnical Engineering — Quiz 1

Questions in this quiz (10)

1. A soil sample has a specific gravity of solids $$G_s=2.70$$, water content $$w=25\%$$, and degree of saturation $$S=80\%$$. Determine the void ratio of the soil.

   • $$0.540$$
   • $$0.844$$
   • $$0.675$$
   • $$1.125$$

2. A soil has a specific gravity of solids $$G_s=2.68$$ and a void ratio $$e=0.72$$. Assuming the unit weight of water is $$\gamma_w=9.81\ \mathrm{kN/m}^3$$, determine the dry unit weight of the soil.

   • $$11.34\ \mathrm{kN/m}^3$$
   • $$18.62\ \mathrm{kN/m}^3$$
   • $$36.52\ \mathrm{kN/m}^3$$
   • $$15.29\ \mathrm{kN/m}^3$$

3. A soil sample has a water content of $$18\%$$, void ratio of $$0.55$$, and specific gravity of solids of $$2.65$$. Determine the degree of saturation.

   • $$86.7\%$$
   • $$72.4\%$$
   • $$65.0\%$$
   • $$55.0\%$$

4. A soil has a void ratio of $$0.85$$. Determine the porosity of the soil.

   • $$85.0\%$$
   • $$54.1\%$$
   • $$45.9\%$$
   • $$38.5\%$$

5. A soil has a specific gravity $$G_s=2.72$$, void ratio $$e=0.65$$, and degree of saturation $$S=90\%$$. Assuming $$\gamma_w=9.81\ \mathrm{kN/m}^3$$, determine the total moist unit weight of the soil.

   • $$16.17\ \mathrm{kN/m}^3$$
   • $$19.65\ \mathrm{kN/m}^3$$
   • $$20.04\ \mathrm{kN/m}^3$$
   • $$22.35\ \mathrm{kN/m}^3$$

6. A soil sample weighed $$222\ \mathrm{g}$$ and had a volume of $$101\ \mathrm{cm}^3$$. The sample was oven-dried and its dry weight was determined to be $$180\ \mathrm{g}$$. The dry unit weight of the soil is most nearly:

   • $$1.78\ \mathrm{g/cm}^3$$
   • $$1.62\ \mathrm{g/cm}^3$$
   • $$1.11\ \mathrm{g/cm}^3$$
   • $$1.16\ \mathrm{g/cm}^3$$

7. A soil sample weighed $$222\ g$$ and its volume was $$101\ cm^3$$. The sample was oven-dried and its weight was determined to be $$185\ g$$. The moisture content of the soil is most nearly:

   • $$20\%$$
   • $$45\%$$
   • $$55\%$$
   • Question is vague

8. A soil sample has a total mass of $$23.3\ g$$, a volume of $$12\ cm^3$$, and an oven-dry mass of $$21.2\ g$$. The volume of solids in the soil sample is $$8.48\ cm^3$$. The void ratio is most nearly:

   • $$0.42$$
   • $$0.53$$
   • $$0.62$$
   • $$0.71$$

9. A sand has a minimum void ratio of $$0.41$$ and a maximum void ratio of $$0.78$$. The actual void ratio is $$0.576$$. The relative density is most nearly:

   • $$40\%$$
   • $$55\%$$
   • $$65\%$$
   • $$80\%$$

10. Based on the grain size distribution curve shown, determine the uniformity coefficient.

    • $$1.6$$
    • $$2.1$$
    • $$2.6$$
    • $$3.2$$