CSLB Concrete C8 License Practice |2026 UPDATE |ACTUAL EXAM
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What is the volume of a cylinder if the diameter equals 3 feet and the length equals to 12 feet? -
(answer)84.78 cubic feet
Explanation:
There are two ways to solve the problem. However, regardless of which method is used, you need to first
determine the area of the circle then multiply it by the length.Traditional MethodUse the following
formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 1.5 feet (half of the diameter
length)Area = 3.14 x 1.5 x 1.5Area = 7.065 sq. ft.Multiply area by the length to find the volume.7.065 x
12 = 84.78Shortcut MethodArea of the circle is 78.5% of the square. Treat the circle as a square and
solve for the area.Find the area of the square instead of the circle.3' x 3' = 9 sq. ft.Since circle is 78.5% of
the square, multiply area of the square by 78.5% (or .785 if there is no percentage sign on the
calculator).9 sq. ft. x .785 = 7.065 square feetMultiply area by the length to find the volume.7.065 x 12 =
84.78 cubic feet
Where are spiral rebar ties used? - (answer)In round columns
Control joints in sidewalks should be spaced at what intervals? - (answer)Equal to the width of the slab
Explanation:
Generally the control joints in sidewalks should be spaced equal to the width of the slab, but not more
than 6 feet apart.
One cubic foot of cement weighs approximately: - (answer)95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15 feet? - (answer)2 ½
cubic yards
Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) =
7.5 feet (half of the diameter length)Area = 3.14 x 7.5 x 7.5Area = 176.625 sq. ft.Multiply area by the
,CSLB Concrete C8 License Practice |2026 UPDATE |ACTUAL EXAM
QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS |GET IT
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depth of the slab (in feet) to find the volume in cubic feet.176.625 x .333 = 58.82 cubic feetConvert cubic
feet into cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince 2.18 is not a given option, round up the number
to 2.5 cubic yardsShortcut MethodThis problem can be solved using a much simpler method. First is to
find the area of the square, then convert it into the area of the circle by multiplying it by 78.5%.Area of
the square = 15' x 15' = 225 square feetArea of the circle = 225 x .785 = 176.625 square feetDivide the
volume by 81 to solve for the cubic yards for a 4" slab.176.625 ÷ 81 = 2.18 cubic yardsSince 2.18 is not a
given option, round up the number to 2.5 cubic yards
The normal tolerance for the location of bends and ends of reinforcing bar is: - (answer)+/- 2 inches
How many cubic yards of backfill are required for a 3' x 5' trench, 1500 ft long, with a 1 foot diameter
pipe? - (answer)789.72
Explanation:
Step 1. Find the net face area of the trench deducting for pipe.Face area including pipe: 3 x 5 = 15 square
feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A = 0.785Find the face area of the trench minus area of the
pipe, which will give you the net area for the backfill.15 - 0.785 = 14.215Step 2. Find the total volume of
the backfill.14.215 x 1500 = 21322.5 cubic feetConvert the volume into cubic yards.21322.5 ÷ 27 =
789.72 cubic yards
When can the live load be calculated by multiplying the height, width and length of a pour and dividing
by the deadload? - (answer)Never
Tensile strength in concrete is achieved by: - (answer)The use of steel reinforcement.
Refer to the house plan. What is the total cost for the foundation slab if the contractor charges $3.54 per
square foot? - (answer)$6524.90
Explanation:
, CSLB Concrete C8 License Practice |2026 UPDATE |ACTUAL EXAM
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The easiest way to solve for the area of the slab is to image a full rectangle of the slab and subtract void
areas from the area of the slab.
Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter void area:
11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the foundation slab: 2013.94
- 12.2 - 21.045 - 137.505 = 1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90
What is the minimum spacing of parallel reinforcing bars placed in two or more layers? - (answer)1 inch
Explanation:
According to the American Concrete Institute, where parallel reinforcement is placed in two or more
layers, bars in the upper layers shall be placed directly above bars in the bottom layer with clear distance
between layers not less than 1 inch.
When applying concrete to concrete there are several factors to consider. Which is most important? -
(answer)In most cases the most important is the bond.
What is the purpose of the rebar? - (answer)To increase the tensile strength
There are many ornamental uses of concrete, including casting architectural elements, ornaments, and
faux finishes. How would you describe terrazzo in the simplest terms? - (answer)A special combination of
colored rock and glass for floors.
What is the minimum size of anchor bolt can be used in seismic category E? - (answer)#5
The building code requires 5/8" anchor bolt to be used in seismic category E.
Construction loads are: - (answer)The maximum loads to which a structure will ever be subjected.
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What is the volume of a cylinder if the diameter equals 3 feet and the length equals to 12 feet? -
(answer)84.78 cubic feet
Explanation:
There are two ways to solve the problem. However, regardless of which method is used, you need to first
determine the area of the circle then multiply it by the length.Traditional MethodUse the following
formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 1.5 feet (half of the diameter
length)Area = 3.14 x 1.5 x 1.5Area = 7.065 sq. ft.Multiply area by the length to find the volume.7.065 x
12 = 84.78Shortcut MethodArea of the circle is 78.5% of the square. Treat the circle as a square and
solve for the area.Find the area of the square instead of the circle.3' x 3' = 9 sq. ft.Since circle is 78.5% of
the square, multiply area of the square by 78.5% (or .785 if there is no percentage sign on the
calculator).9 sq. ft. x .785 = 7.065 square feetMultiply area by the length to find the volume.7.065 x 12 =
84.78 cubic feet
Where are spiral rebar ties used? - (answer)In round columns
Control joints in sidewalks should be spaced at what intervals? - (answer)Equal to the width of the slab
Explanation:
Generally the control joints in sidewalks should be spaced equal to the width of the slab, but not more
than 6 feet apart.
One cubic foot of cement weighs approximately: - (answer)95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15 feet? - (answer)2 ½
cubic yards
Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) =
7.5 feet (half of the diameter length)Area = 3.14 x 7.5 x 7.5Area = 176.625 sq. ft.Multiply area by the
,CSLB Concrete C8 License Practice |2026 UPDATE |ACTUAL EXAM
QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS |GET IT
100% CORRECT!! ALREADY GRADED A+
depth of the slab (in feet) to find the volume in cubic feet.176.625 x .333 = 58.82 cubic feetConvert cubic
feet into cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince 2.18 is not a given option, round up the number
to 2.5 cubic yardsShortcut MethodThis problem can be solved using a much simpler method. First is to
find the area of the square, then convert it into the area of the circle by multiplying it by 78.5%.Area of
the square = 15' x 15' = 225 square feetArea of the circle = 225 x .785 = 176.625 square feetDivide the
volume by 81 to solve for the cubic yards for a 4" slab.176.625 ÷ 81 = 2.18 cubic yardsSince 2.18 is not a
given option, round up the number to 2.5 cubic yards
The normal tolerance for the location of bends and ends of reinforcing bar is: - (answer)+/- 2 inches
How many cubic yards of backfill are required for a 3' x 5' trench, 1500 ft long, with a 1 foot diameter
pipe? - (answer)789.72
Explanation:
Step 1. Find the net face area of the trench deducting for pipe.Face area including pipe: 3 x 5 = 15 square
feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A = 0.785Find the face area of the trench minus area of the
pipe, which will give you the net area for the backfill.15 - 0.785 = 14.215Step 2. Find the total volume of
the backfill.14.215 x 1500 = 21322.5 cubic feetConvert the volume into cubic yards.21322.5 ÷ 27 =
789.72 cubic yards
When can the live load be calculated by multiplying the height, width and length of a pour and dividing
by the deadload? - (answer)Never
Tensile strength in concrete is achieved by: - (answer)The use of steel reinforcement.
Refer to the house plan. What is the total cost for the foundation slab if the contractor charges $3.54 per
square foot? - (answer)$6524.90
Explanation:
, CSLB Concrete C8 License Practice |2026 UPDATE |ACTUAL EXAM
QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS |GET IT
100% CORRECT!! ALREADY GRADED A+
The easiest way to solve for the area of the slab is to image a full rectangle of the slab and subtract void
areas from the area of the slab.
Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter void area:
11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the foundation slab: 2013.94
- 12.2 - 21.045 - 137.505 = 1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90
What is the minimum spacing of parallel reinforcing bars placed in two or more layers? - (answer)1 inch
Explanation:
According to the American Concrete Institute, where parallel reinforcement is placed in two or more
layers, bars in the upper layers shall be placed directly above bars in the bottom layer with clear distance
between layers not less than 1 inch.
When applying concrete to concrete there are several factors to consider. Which is most important? -
(answer)In most cases the most important is the bond.
What is the purpose of the rebar? - (answer)To increase the tensile strength
There are many ornamental uses of concrete, including casting architectural elements, ornaments, and
faux finishes. How would you describe terrazzo in the simplest terms? - (answer)A special combination of
colored rock and glass for floors.
What is the minimum size of anchor bolt can be used in seismic category E? - (answer)#5
The building code requires 5/8" anchor bolt to be used in seismic category E.
Construction loads are: - (answer)The maximum loads to which a structure will ever be subjected.
