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CNST-2420 Exam 1 Study Guide || Already Passed.
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Soil and rock consist essentially of the same matter. True or False? correct answers True In the commonly used soil classification system, sand and silt are classified as a. coarse-grained soils b. fine-grained soils c. organic soils d. inorganic soils e. none of the above correct answers...

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  • August 4, 2024
  • 10
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • soil and rock consist essentially of the same matt

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  • CNST-2420
  • CNST-2420

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CNST-2420 Exam 1 Study Guide || Already Passed.
Soil and rock consist essentially of the same matter. True or False? correct answers True

In the commonly used soil classification system, sand and silt are classified as

a. coarse-grained soils
b. fine-grained soils
c. organic soils
d. inorganic soils
e. none of the above correct answers none of the above

The four commonly used classifications of soils arranged in order of decreasing particle size are
correct answers gravel, sand, silt, and clay

Which of the following statements is correct?

a. Gravel particles have a platelike shape.
b. Sand particles have a platelike shape.
c. Silt particles have a platelike shape.
d. Clay particles have a platelike shape. correct answers Clay particles have a platelike shape

Cohesive soils are those in which the dry soil particles tend to separate from each other when
mixed with a small amount of water. True or False? correct answers False

To obtain soil-sampling tubes from below ground, which soil-testing method is commonly used?
correct answers Test boring method

During soil testing, soil samples are obtained from correct answers several locations on the site
and from several depths below ground

All testing of soil samples is generally done at the site

a. because modern soil sampling equipment is fully equipped with soil testing facility.
b. because the delay in bringing soil samples to the laboratory falsifies test results.
c. because the vibration of soil samples caused by transportation falsifies test results.
d. all of the above
e. none of the above correct answers none of the above

In terms of soil behavior in earthquakes, building codes classify a construction site based on soil
conditions. The primary property of soil that is used in this classification is correct answers the
stiffness/density of soil

The bearing capacity of a soil refers to

a. the density of soil

, b. the modulus of elasticity of soil
c. the compressive strength of soil
d. whether the soil is native to the site
e. none of the above correct answers none of the above

The bearing capacity of a soil is generally expressed in terms of correct answers pounds or kips
per square foot

If the bearing capacity of the soil is high, the footing area required is large. True or False? correct
answers False

The maximum presumptive bearing capacity value of bedrock provided by the International
Building Code is correct answers 12.0 ksf

The building codes do not mandate geotechnical investigations for all building construction sites.
True or False? correct answers True

Grading at a site refers to

a. evaluating the existing subsurface conditions of a site
b. evaluating the groundwater conditions at a site
c. compacting the soil to required density
d. all of the above
e. none of the above correct answers none of the above

Engineered fill refers to the soil that is correct answers all of the above

specially formulated to provide the required properties

placed per geotechnical engineer's specifications
compacted per the geotechnical engineer's

specifications and inspection

A benched excavation is generally used correct answers on open suburban sites

sheet piles are used correct answers as excavation supports

Which of the following is not used for excavation supports? correct answers Precast concrete
piles

In the excavation support system using soldier piles, the soldier piles consist of correct answers
structural steel sections

In the soldier pile and lagging system, the lagging generally consists of correct answers pressure
treated lumber

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