CSLB CONCRETE C8 LICENSE PRACTICE TEST
1, 2, 3 AND 4 WITH COMPLETE SOLUTIONS
100% VERIFIED NEW 2026\2027 update
-CSLB Concrete C8 License Practice Test 1 -CSLB
Concrete C8 License Practice Test 2 -CSLB Concrete C8
License Practice Test 3 -CSLB Concrete C8 License
Practice Test 4
CSLB Concrete C8 License Practice Test 1
What is the volume of a cylinder if the diameter is 3 feet and the length equals to 12 feet? -
CORRECT 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 length to find the
volume.7.065 x 12 = 84.78 Shortcut Method Area of circle is 78.5% of the square. Work with the
circle as a square and solve for the area. Find area of the square instead of 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? - CORRECT ANSWER In round columns
Control joints in sidewalks should be spaced at what intervals? - CORRECT 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: - CORRECT ANSWER 95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15 feet? -
CORRECT 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 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: - CORRECT
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? - CORRECT ANSWER 789.72
Explanation
Step 1. Determine the net face area of the trench minus pipe.Face area with pipe: 3 x 5 = 15 square
feetArea of the pipe: ????=????????2A = 3.14 x.5 x.5A = 0.785Determine 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.
Determine 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 obtained by multiplying the height, width and length of a pour and
divided by the dead load? - CORRECT ANSWER Never
,The tensile strength in concrete is developed by: - CORRECT ANSWER Steel reinforcement.
Looking at the house plan. What would the total cost of the foundation slab be, if the contractor
charged $3.54 a square foot? - CORRECT ANSWER $6524.90
Explanation
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? -
CORRECT 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?
- CORRECT ANSWER In most cases the most important is the bond.
What is the purpose of the rebar? - CORRECT 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? - CORRECT 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? - CORRECT
ANSWER
#5
The building code requires 5/8" anchor bolt to be used in seismic category E.
Construction loads are: - CORRECT ANSWER The maximum loads to which a structure will ever
be subjected.
In some cases it may be necessary to use stronger or double ties. Why? - CORRECT ANSWER As
a safety precaution when workers may need to climb on reinforcement.
What size of rebar is used to reinforce stem wall? - CORRECT ANSWER #4
Explanation
The code requires ½ inch rebar to be used in stem walls.
On concrete paving or roadway, it is normal to use transverse joints at regular intervals. These
joints are best filled and sealed. Why? - CORRECT ANSWER To reduce risk of exposure to the
reinforcing.
When batching concrete, what percentage of concrete powder is commonly used? -
CORRECT ANSWER 25% to 40% cement powder
The sides of the main field of the slab must be reinforced with an by grid. - CORRECT
ANSWER 15".18"
How long can a batch of concrete be in the truck before considerations of quality arise? -
CORRECT ANSWER 45 minutes
1, 2, 3 AND 4 WITH COMPLETE SOLUTIONS
100% VERIFIED NEW 2026\2027 update
-CSLB Concrete C8 License Practice Test 1 -CSLB
Concrete C8 License Practice Test 2 -CSLB Concrete C8
License Practice Test 3 -CSLB Concrete C8 License
Practice Test 4
CSLB Concrete C8 License Practice Test 1
What is the volume of a cylinder if the diameter is 3 feet and the length equals to 12 feet? -
CORRECT 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 length to find the
volume.7.065 x 12 = 84.78 Shortcut Method Area of circle is 78.5% of the square. Work with the
circle as a square and solve for the area. Find area of the square instead of 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? - CORRECT ANSWER In round columns
Control joints in sidewalks should be spaced at what intervals? - CORRECT 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: - CORRECT ANSWER 95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15 feet? -
CORRECT 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 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: - CORRECT
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? - CORRECT ANSWER 789.72
Explanation
Step 1. Determine the net face area of the trench minus pipe.Face area with pipe: 3 x 5 = 15 square
feetArea of the pipe: ????=????????2A = 3.14 x.5 x.5A = 0.785Determine 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.
Determine 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 obtained by multiplying the height, width and length of a pour and
divided by the dead load? - CORRECT ANSWER Never
,The tensile strength in concrete is developed by: - CORRECT ANSWER Steel reinforcement.
Looking at the house plan. What would the total cost of the foundation slab be, if the contractor
charged $3.54 a square foot? - CORRECT ANSWER $6524.90
Explanation
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? -
CORRECT 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?
- CORRECT ANSWER In most cases the most important is the bond.
What is the purpose of the rebar? - CORRECT 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? - CORRECT 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? - CORRECT
ANSWER
#5
The building code requires 5/8" anchor bolt to be used in seismic category E.
Construction loads are: - CORRECT ANSWER The maximum loads to which a structure will ever
be subjected.
In some cases it may be necessary to use stronger or double ties. Why? - CORRECT ANSWER As
a safety precaution when workers may need to climb on reinforcement.
What size of rebar is used to reinforce stem wall? - CORRECT ANSWER #4
Explanation
The code requires ½ inch rebar to be used in stem walls.
On concrete paving or roadway, it is normal to use transverse joints at regular intervals. These
joints are best filled and sealed. Why? - CORRECT ANSWER To reduce risk of exposure to the
reinforcing.
When batching concrete, what percentage of concrete powder is commonly used? -
CORRECT ANSWER 25% to 40% cement powder
The sides of the main field of the slab must be reinforced with an by grid. - CORRECT
ANSWER 15".18"
How long can a batch of concrete be in the truck before considerations of quality arise? -
CORRECT ANSWER 45 minutes
