Soil Mechanics Final Exam Questions and Answers
What is the sieve number that is used to separate fine sand from medium sand? - Answers40
What is the grain size diameter (in mm) that is the dividing line between fines and sand particles sizes? - Answers0.075
TF: The diffuse double layer ...
What is the sieve number that is used to separate fine sand from medium sand? - Answers✓✓40
What is the grain size diameter (in mm) that is the dividing line between fines and sand particles
sizes? - Answers✓✓0.075
TF: The diffuse double layer is the basic structure of each clay particle, and these clay particle
diffuse double layers are the 2 different mineral sheets bonded together - Answers✓✓False. The
diffuse double layer is the region of attracted positive ions in solution and the negatively
charged surface of the clay
The plastic limit test involves rolling out a soil thread until it just breaks into smaller pieces
when thread is what diameter? - Answers✓✓1/8 inch
List the 4 conditions necessary for Liquefaction to occur in a natural sand deposit -
Answers✓✓Loose soil, fine sand, below GWT, earthquakes
TF: A clay soil is considered to be at its liquid limit when the slot closes for 1/2 inch of its
length at 35 drops of the brass cup - Answers✓✓False. 25 drops
TF: All the clay soils exhibit the same behavior and shear strength when at their Liquid Limit,
even if one clay has LL=130% and another clay has LL=25% - Answers✓✓True
List the three most common clay minerals that were discussed in class -
Answers✓✓Montmorillonite, Kaolinite, Illite
Which common clay mineral has the most potential for shrink and swell when water content
changes? - Answers✓✓Montmorillonite
What is the name of the lab test that is used to determine the grain size distribution of the
particles of fine soil, that pass through the No. 200 sieve? - Answers✓✓Hydrometer Analysis
TF: Clay soils usually have a void ratio that is greater than 1.0, but not sand. - Answers✓✓True
Which of the following 4 USCS classified soils would be best for use as an impervious cap over
a landfill, that must provide: impermeability, resistance to shrink-swell, and relative ease of
compaction - Answers✓✓CL
If a sand soil has a void ratio value of 0.30, then what term best describes its density? -
Answers✓✓Very dense
What is the symbol for porosity? - Answers✓✓n
What is the symbol for void ratio? - Answers✓✓e
What is the equation for the degree of saturation? - Answers✓✓s=(Vw/Vv)*100%
What is the equation for the degree of water content? - Answers✓✓w=(Ww/Ws)*100%
What is the equation for the specific gravity? - Answers✓✓s=(Ws/(Vs*Gammaw)
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