1|Page
NEVADA C-5 CONCRETE CONTRACTOR EXAM BANK
| TESTING EXAM QUESTIONS AND ANSWERS | |
LATEST UPDATE 2026
Which is the first step that needs to be taken prior to starting any
excavation work? - ANSWER -contacting the local utility companies
Before excavating for a new building, how should subsoil conditions be
determined? - ANSWER -conducting test borings
What type fastener is NOT allowed when working above grade or below
grade on wood foundations? - ANSWER -Electrogalvanized steel.
What are batter boards? - ANSWER -Stakes and ledger boards marking
building lines.
What is the MINIMUM overlap for joints in the polyethylene film
moisture barrier applied over the exterior of a below grade foundation
wall? - ANSWER -6 inches.
What is the purpose of a cove or cant strip at a foundation joint? -
ANSWER -Deflect water from the foundation wall.
pg. 1
,2|Page
750 feet of pipe is being laid at 0.5% slope. On a topographic map that
has 6 inch contour intervals, approximately how many intervals will be
depicted on the map from one end of the pipe to the other? - ANSWER
-8 contour intervals
A driveway rises 18 feet in a horizontal distance of 190 feet. What is the
percent grade? - ANSWER -9%
How long will it take to excavate a trench that is 8 foot deep by 4 feet
wide by 100 feet long? The hourly production rate is 40 BCY and the
operator has average ability with an efficiency factor of 75%. - ANSWER
-4 hours
Air-entrained concrete MUST be used for all of the following EXCEPT -
ANSWER -interior slabs on grade.
The amount of water per sack of cement is what controls all EXCEPT -
ANSWER -set up speed.
What is the MINIMUM compressive strength for concrete used in a
foundation wall that will be exposed to weather? - ANSWER -2500 PSI
What is the MINIMUM thickness allowed for concrete slab on ground
floors? - ANSWER -3.5 inches.
pg. 2
,3|Page
What is the MINIMUM vertical reinforcement spacing for a reinforced
concrete foundation wall that is 7 feet high and 10 inches thick on type
SP soil? - ANSWER -56 inches on center.
What is the maximum slump that concrete should have if it is to be
used for floor slabs? - ANSWER -4 inches
Unless otherwise specified, what is the standard guideline for spacing
contraction joints to space them in feet? - ANSWER -2 1/2 times the
slab depth in inches
Increasing the slump of concrete does which of the following? -
ANSWER -increases its wetness
In general, what is the MINIMUM concrete covering for steel
reinforcement in a footing? - ANSWER -3.0 inches.
What is a lengthwise grain separation between or through the growth
rings of lumber called? - ANSWER -shake
Wall framing is being constructed one floor at a time. What type of
wood framing method is being used? - ANSWER -Platform.
What is NOT required in exterior nonbearing walls? - ANSWER -Load-
bearing headers.
pg. 3
, 4|Page
A jack rafter is face nailed to a hip rafter. What is the minimum number
of 16d common nails that should be used? - ANSWER -three
How MUST rafters be framed to each other? - ANSWER -With a gusset
plate.
A simple set of cleat stairs will be installed in a basement. The distance
between the basement floor and the first floor is 8 feet. How many
treads will be REQUIRED for these stairs? - ANSWER -13
All of the following are benefits of platform construction as compared
to balloon construction EXCEPT - ANSWER -easier installation of
plumbing and wiring
Where is temporary horizontal bracing attached when erecting trusses?
- ANSWER -Near the ridge line of the truss.
A plank measures 3" x 16" and is 24 feet long. How many board feet of
lumber are in 26 of these planks? (Round off to the nearest whole
number.) - ANSWER -2,496
A third stairway stringer should be used when the stair width exceeds
how many inches? - ANSWER -30
pg. 4
NEVADA C-5 CONCRETE CONTRACTOR EXAM BANK
| TESTING EXAM QUESTIONS AND ANSWERS | |
LATEST UPDATE 2026
Which is the first step that needs to be taken prior to starting any
excavation work? - ANSWER -contacting the local utility companies
Before excavating for a new building, how should subsoil conditions be
determined? - ANSWER -conducting test borings
What type fastener is NOT allowed when working above grade or below
grade on wood foundations? - ANSWER -Electrogalvanized steel.
What are batter boards? - ANSWER -Stakes and ledger boards marking
building lines.
What is the MINIMUM overlap for joints in the polyethylene film
moisture barrier applied over the exterior of a below grade foundation
wall? - ANSWER -6 inches.
What is the purpose of a cove or cant strip at a foundation joint? -
ANSWER -Deflect water from the foundation wall.
pg. 1
,2|Page
750 feet of pipe is being laid at 0.5% slope. On a topographic map that
has 6 inch contour intervals, approximately how many intervals will be
depicted on the map from one end of the pipe to the other? - ANSWER
-8 contour intervals
A driveway rises 18 feet in a horizontal distance of 190 feet. What is the
percent grade? - ANSWER -9%
How long will it take to excavate a trench that is 8 foot deep by 4 feet
wide by 100 feet long? The hourly production rate is 40 BCY and the
operator has average ability with an efficiency factor of 75%. - ANSWER
-4 hours
Air-entrained concrete MUST be used for all of the following EXCEPT -
ANSWER -interior slabs on grade.
The amount of water per sack of cement is what controls all EXCEPT -
ANSWER -set up speed.
What is the MINIMUM compressive strength for concrete used in a
foundation wall that will be exposed to weather? - ANSWER -2500 PSI
What is the MINIMUM thickness allowed for concrete slab on ground
floors? - ANSWER -3.5 inches.
pg. 2
,3|Page
What is the MINIMUM vertical reinforcement spacing for a reinforced
concrete foundation wall that is 7 feet high and 10 inches thick on type
SP soil? - ANSWER -56 inches on center.
What is the maximum slump that concrete should have if it is to be
used for floor slabs? - ANSWER -4 inches
Unless otherwise specified, what is the standard guideline for spacing
contraction joints to space them in feet? - ANSWER -2 1/2 times the
slab depth in inches
Increasing the slump of concrete does which of the following? -
ANSWER -increases its wetness
In general, what is the MINIMUM concrete covering for steel
reinforcement in a footing? - ANSWER -3.0 inches.
What is a lengthwise grain separation between or through the growth
rings of lumber called? - ANSWER -shake
Wall framing is being constructed one floor at a time. What type of
wood framing method is being used? - ANSWER -Platform.
What is NOT required in exterior nonbearing walls? - ANSWER -Load-
bearing headers.
pg. 3
, 4|Page
A jack rafter is face nailed to a hip rafter. What is the minimum number
of 16d common nails that should be used? - ANSWER -three
How MUST rafters be framed to each other? - ANSWER -With a gusset
plate.
A simple set of cleat stairs will be installed in a basement. The distance
between the basement floor and the first floor is 8 feet. How many
treads will be REQUIRED for these stairs? - ANSWER -13
All of the following are benefits of platform construction as compared
to balloon construction EXCEPT - ANSWER -easier installation of
plumbing and wiring
Where is temporary horizontal bracing attached when erecting trusses?
- ANSWER -Near the ridge line of the truss.
A plank measures 3" x 16" and is 24 feet long. How many board feet of
lumber are in 26 of these planks? (Round off to the nearest whole
number.) - ANSWER -2,496
A third stairway stringer should be used when the stair width exceeds
how many inches? - ANSWER -30
pg. 4
