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CSLB CONCRETE C8 LICENSE PRACTICE TEST 1,2,3 AND 4 NEWEST 2025/ 2026 EXAM NEWEST
COMPLETE 300 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW!!
TEST 1
A mix with a higher percentage of rock has the advantage of: - ANSWER-Being less expensive.
For quick dry applications you would most commonly use which kind of concrete? - ANSWER-
Type 3
You have 5 employees that work for eight hours. How much would you have to pay your
employees, if one of them is an apprentice who makes $17/hour, supervisor makes $33/hour,
and three journeymen make $22/hour? - ANSWER-$928.00
Explanation:
Apprentice: $17 x 8 hours = $136Supervisor: $33 x 8 hours = $264Journeymen: 3 x $22 x 8 hours
= $528Total: $136 + $264 + $528 = $928
Refer to the house plan. How many square feet is the foundation slab? - ANSWER-1844 sq ft
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.
Weather conditions may make placing concrete inadvisable, including: - ANSWER-High winds
and high temperatures
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Refer to the house plan. How many cubic yards of concrete needs to be ordered for the
foundation slab that is 4 inches thick? - ANSWER-23 cubic yards
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.Traditional Method:Multiply
the area of the slab by the thickness of the slab (in inches).1843.19 x 0.333' = 613.78 cubic
feetConvert the volume into cubic yards.613.78 ÷ 27 = 22.73 cubic yards (rounded up to 23
cubic yards)Industry Method:Divide the area by 81 to get cubic yards.1843.19 sq ft ÷ 81 = 22.76
cubic yards (rounded up to 23 cubic yards)
What is the spacing of anchor bolts from ends of sill plates? - ANSWER-4" min, 12" max
In a beam not exposed to weather or soil; what is the minimum coverage for #4 reinforcing bar:
- ANSWER-1 inch
When welding bars on sight, special attention should be paid to safety and ____________. -
ANSWER-The exact composition of the materials to be welded
Explanation:
Not all alloys used in reinforcing bar are compatible.
,3|Page
What is the maximum spacing of the control joints in a slab that is to receive a floor finish? -
ANSWER-joints are not necessary
Explanation:
If the carpet, hardwood floor, or other floor finishes are to be installed on the slab, the control
joints are not necessary since the floor finishes will cover unsightly cracks in the slab.
Finishing with a steel float: - ANSWER-Reduces risk of cracking.
Please refer to the house plan. How many cubic yards of concrete is required for the patio
(excluding sidewalk), if the slab is 4 inches thick? - ANSWER-5.75 cubic yards
Explanation:
Traditional MethodMultiply area of the slab by the thickness of the slab to get the volume in
cubic feet.457 x 4" or .333 = 152.181 cubic feetConvert cubic feet into cubic yards by diving the
cubic feet by 27.152.181 ÷ 27 = 5.6 cubic yards
Industry MethodDivide the area of the slab (sq ft) by 81 to get cubic yards.457 sq ft ÷ 81 = 5.6
cubic yards
Round up to select the best answer, which is 5.75 cubic yards.
What is the minimum size of anchor bolt can be used in seismic category D? - ANSWER-#4
Explanation:
The building code requires 1/2" anchor bolt to be used in seismic category D or less.
What size of footing required for a 2-story building with a load bearing value of 1,500psf? -
ANSWER-15
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How many cubic yards of concrete is required for a 4" slab with the circumference of 25 feet? -
ANSWER-3/4 cubic yard(s)
Explanation:
Since the circumference was provided to calculate the area of the circle, we need to figure out
the diameter and/or radius to solve the problem.Circumference = 25Diameter = Circumference
(25') ÷ π (or 3.14) = 7.96 feetRadius = Diameter (7.96') ÷ 2 = 3.98 feetTraditional MethodUse the
following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 3.98 feetArea =
3.14 x 3.98 x 3.98Area = 49.74 sq. ft.Multiply area by the depth of the slab (in feet) to find the
volume in cubic feet.49.74 x .333 = 16.56 cubic feetConvert cubic feet into cubic yards.16.56 ÷
27 = 0.61 cu yds (round up to 3/4)Shortcut 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%.Diameter = 7.96'Area of the square = 7.96' x 7.96' = 63.36 square
feetArea of the circle = 63.36 x .785 = 49.74 square feetDivide the volume by 81 to solve for the
cubic yards for a 4" slab.49.74 ÷ 81 = 0.61 cu yds (round up to 3/4)
The main field of the slab must be reinforced with an ___ by ___ grid. - ANSWER-18"...18"
How many cubic yards of concrete is required for a 4" slab with the radius of 10 feet? -
ANSWER-3.87 cubic yards
Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14 and
radius (r) = 10 feet (half of the diameter length)Area = 3.14 x 10 x 10Area = 314 sq. ft.Multiply
area by the depth of the slab (in feet) to find the volume in cubic feet.314 x .333 = 104.562
cubic feetConvert cubic feet into cubic yards.104.562 ÷ 27 = 3.87 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%.Diameter = radius x
2 = 20'Area of the square = 20' x 20' = 400 square feetArea of the circle = 400 x .785 = 314
square feetDivide the volume by 81 to solve for the cubic yards for a 4" slab.314 ÷ 81 = 3.87
cubic yards
CSLB CONCRETE C8 LICENSE PRACTICE TEST 1,2,3 AND 4 NEWEST 2025/ 2026 EXAM NEWEST
COMPLETE 300 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW!!
TEST 1
A mix with a higher percentage of rock has the advantage of: - ANSWER-Being less expensive.
For quick dry applications you would most commonly use which kind of concrete? - ANSWER-
Type 3
You have 5 employees that work for eight hours. How much would you have to pay your
employees, if one of them is an apprentice who makes $17/hour, supervisor makes $33/hour,
and three journeymen make $22/hour? - ANSWER-$928.00
Explanation:
Apprentice: $17 x 8 hours = $136Supervisor: $33 x 8 hours = $264Journeymen: 3 x $22 x 8 hours
= $528Total: $136 + $264 + $528 = $928
Refer to the house plan. How many square feet is the foundation slab? - ANSWER-1844 sq ft
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.
Weather conditions may make placing concrete inadvisable, including: - ANSWER-High winds
and high temperatures
,2|Page
Refer to the house plan. How many cubic yards of concrete needs to be ordered for the
foundation slab that is 4 inches thick? - ANSWER-23 cubic yards
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.Traditional Method:Multiply
the area of the slab by the thickness of the slab (in inches).1843.19 x 0.333' = 613.78 cubic
feetConvert the volume into cubic yards.613.78 ÷ 27 = 22.73 cubic yards (rounded up to 23
cubic yards)Industry Method:Divide the area by 81 to get cubic yards.1843.19 sq ft ÷ 81 = 22.76
cubic yards (rounded up to 23 cubic yards)
What is the spacing of anchor bolts from ends of sill plates? - ANSWER-4" min, 12" max
In a beam not exposed to weather or soil; what is the minimum coverage for #4 reinforcing bar:
- ANSWER-1 inch
When welding bars on sight, special attention should be paid to safety and ____________. -
ANSWER-The exact composition of the materials to be welded
Explanation:
Not all alloys used in reinforcing bar are compatible.
,3|Page
What is the maximum spacing of the control joints in a slab that is to receive a floor finish? -
ANSWER-joints are not necessary
Explanation:
If the carpet, hardwood floor, or other floor finishes are to be installed on the slab, the control
joints are not necessary since the floor finishes will cover unsightly cracks in the slab.
Finishing with a steel float: - ANSWER-Reduces risk of cracking.
Please refer to the house plan. How many cubic yards of concrete is required for the patio
(excluding sidewalk), if the slab is 4 inches thick? - ANSWER-5.75 cubic yards
Explanation:
Traditional MethodMultiply area of the slab by the thickness of the slab to get the volume in
cubic feet.457 x 4" or .333 = 152.181 cubic feetConvert cubic feet into cubic yards by diving the
cubic feet by 27.152.181 ÷ 27 = 5.6 cubic yards
Industry MethodDivide the area of the slab (sq ft) by 81 to get cubic yards.457 sq ft ÷ 81 = 5.6
cubic yards
Round up to select the best answer, which is 5.75 cubic yards.
What is the minimum size of anchor bolt can be used in seismic category D? - ANSWER-#4
Explanation:
The building code requires 1/2" anchor bolt to be used in seismic category D or less.
What size of footing required for a 2-story building with a load bearing value of 1,500psf? -
ANSWER-15
, 4|Page
How many cubic yards of concrete is required for a 4" slab with the circumference of 25 feet? -
ANSWER-3/4 cubic yard(s)
Explanation:
Since the circumference was provided to calculate the area of the circle, we need to figure out
the diameter and/or radius to solve the problem.Circumference = 25Diameter = Circumference
(25') ÷ π (or 3.14) = 7.96 feetRadius = Diameter (7.96') ÷ 2 = 3.98 feetTraditional MethodUse the
following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 3.98 feetArea =
3.14 x 3.98 x 3.98Area = 49.74 sq. ft.Multiply area by the depth of the slab (in feet) to find the
volume in cubic feet.49.74 x .333 = 16.56 cubic feetConvert cubic feet into cubic yards.16.56 ÷
27 = 0.61 cu yds (round up to 3/4)Shortcut 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%.Diameter = 7.96'Area of the square = 7.96' x 7.96' = 63.36 square
feetArea of the circle = 63.36 x .785 = 49.74 square feetDivide the volume by 81 to solve for the
cubic yards for a 4" slab.49.74 ÷ 81 = 0.61 cu yds (round up to 3/4)
The main field of the slab must be reinforced with an ___ by ___ grid. - ANSWER-18"...18"
How many cubic yards of concrete is required for a 4" slab with the radius of 10 feet? -
ANSWER-3.87 cubic yards
Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14 and
radius (r) = 10 feet (half of the diameter length)Area = 3.14 x 10 x 10Area = 314 sq. ft.Multiply
area by the depth of the slab (in feet) to find the volume in cubic feet.314 x .333 = 104.562
cubic feetConvert cubic feet into cubic yards.104.562 ÷ 27 = 3.87 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%.Diameter = radius x
2 = 20'Area of the square = 20' x 20' = 400 square feetArea of the circle = 400 x .785 = 314
square feetDivide the volume by 81 to solve for the cubic yards for a 4" slab.314 ÷ 81 = 3.87
cubic yards
