Nevada C-7 Excavating & Grading
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. Which type of soil is most likely to experience significant shrink-swell
behavior?
a) Sand
b) Silt
c) Clay
d) Gravel
Answer: Clay
Rationale: Clay soils have fine particles that expand when wet and shrink
when dry, causing significant volume changes, which is critical in grading
and foundation work.
2. What is the primary purpose of a bench in slope excavation?
a) Reduce equipment wear
b) Increase slope height
c) Prevent slope failure
d) Improve drainage
Answer: Prevent slope failure
Rationale: Benching creates steps in a slope to reduce the risk of soil
collapse and maintain stability during excavation.
3. When performing cut and fill operations, the term “cut” refers to:
a) Adding soil to a low area
b) Compacting soil
, c) Removing soil from a high area
d) Spreading topsoil
Answer: Removing soil from a high area
Rationale: “Cut” means excavation or removal of soil to lower the grade,
whereas “fill” means adding soil to raise the grade.
4. Which type of equipment is most commonly used for fine grading?
a) Scraper
b) Bulldozer
c) Motor grader
d) Excavator
Answer: Motor grader
Rationale: Motor graders are designed for precise leveling and shaping of
soil surfaces, critical for fine grading.
5. In Nevada, what is the maximum allowable overhang for an
unsupported trench deeper than 5 feet?
a) 1 foot
b) 2 feet
c) 3 feet
d) 0 feet
Answer: 0 feet
Rationale: OSHA and Nevada regulations prohibit unsupported overhangs
in deep trenches to prevent cave-ins.
6. The term “compaction” refers to:
a) Removing debris from soil
b) Adding topsoil
c) Increasing soil density by mechanical means
d) Watering soil
Answer: Increasing soil density by mechanical means
Rationale: Compaction reduces air voids in soil, increasing stability for
foundations and roads.
, 7. What is the main function of a geotextile in grading operations?
a) Fertilize soil
b) Mark property lines
c) Separate, filter, or reinforce soils
d) Speed up excavation
Answer: Separate, filter, or reinforce soils
Rationale: Geotextiles prevent mixing of soil layers, improve drainage, and
reinforce weak soils.
8. Which type of soil is easiest to compact?
a) Gravel
b) Sandy soil
c) Clay
d) Organic soil
Answer: Sandy soil
Rationale: Sandy soils drain well and have fewer cohesive forces, making
them easier to achieve desired compaction.
9. When grading a site, what is the standard minimum slope for drainage
away from a building?
a) 0.5%
b) 1%
c) 2%
d) 5%
Answer: 2%
Rationale: A 2% slope (¼ inch per foot) ensures water flows away from
structures, reducing risk of foundation damage.
10. Which of the following is NOT a factor affecting soil
compaction?
a) Moisture content
b) Soil type
c) Compaction equipment
d) Soil color
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which type of soil is most likely to experience significant shrink-swell
behavior?
a) Sand
b) Silt
c) Clay
d) Gravel
Answer: Clay
Rationale: Clay soils have fine particles that expand when wet and shrink
when dry, causing significant volume changes, which is critical in grading
and foundation work.
2. What is the primary purpose of a bench in slope excavation?
a) Reduce equipment wear
b) Increase slope height
c) Prevent slope failure
d) Improve drainage
Answer: Prevent slope failure
Rationale: Benching creates steps in a slope to reduce the risk of soil
collapse and maintain stability during excavation.
3. When performing cut and fill operations, the term “cut” refers to:
a) Adding soil to a low area
b) Compacting soil
, c) Removing soil from a high area
d) Spreading topsoil
Answer: Removing soil from a high area
Rationale: “Cut” means excavation or removal of soil to lower the grade,
whereas “fill” means adding soil to raise the grade.
4. Which type of equipment is most commonly used for fine grading?
a) Scraper
b) Bulldozer
c) Motor grader
d) Excavator
Answer: Motor grader
Rationale: Motor graders are designed for precise leveling and shaping of
soil surfaces, critical for fine grading.
5. In Nevada, what is the maximum allowable overhang for an
unsupported trench deeper than 5 feet?
a) 1 foot
b) 2 feet
c) 3 feet
d) 0 feet
Answer: 0 feet
Rationale: OSHA and Nevada regulations prohibit unsupported overhangs
in deep trenches to prevent cave-ins.
6. The term “compaction” refers to:
a) Removing debris from soil
b) Adding topsoil
c) Increasing soil density by mechanical means
d) Watering soil
Answer: Increasing soil density by mechanical means
Rationale: Compaction reduces air voids in soil, increasing stability for
foundations and roads.
, 7. What is the main function of a geotextile in grading operations?
a) Fertilize soil
b) Mark property lines
c) Separate, filter, or reinforce soils
d) Speed up excavation
Answer: Separate, filter, or reinforce soils
Rationale: Geotextiles prevent mixing of soil layers, improve drainage, and
reinforce weak soils.
8. Which type of soil is easiest to compact?
a) Gravel
b) Sandy soil
c) Clay
d) Organic soil
Answer: Sandy soil
Rationale: Sandy soils drain well and have fewer cohesive forces, making
them easier to achieve desired compaction.
9. When grading a site, what is the standard minimum slope for drainage
away from a building?
a) 0.5%
b) 1%
c) 2%
d) 5%
Answer: 2%
Rationale: A 2% slope (¼ inch per foot) ensures water flows away from
structures, reducing risk of foundation damage.
10. Which of the following is NOT a factor affecting soil
compaction?
a) Moisture content
b) Soil type
c) Compaction equipment
d) Soil color
