CSLB CONCRETE C8 LICENSE PRACTICE
TEST 1,2,3 AND 4 2025 EXAM 2024-2025 WITH
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|FREQUENTLY TESTED QUESTIONS AND
SOLUTIONS |ALREADY GRADED A+|BRAND
NEW!!!|LATEST UPDATE |GUARANTEED
PASS
What is the concrete mixture ratio of 1:2:4?
Standard
Explanation:
The mixture ratio of 1:2:4 stands for 1 part cement, 2 parts of sand or fine aggregate, and 3 parts of
coarse aggregate.Here is all of the mixture ratios:Lean 1:3:6Medium 1:2 ½:5Standard 1:2:4Rich 1:2:3
What is the minimum concrete cover, if rebar is cast against and permanently exposed to earth?
3 inches
Explanation:
Concrete cover as protection of reinforcement against weather and other effects is measured from
the concrete surface to the outermost surface of the steel. This is also known as concrete tolerance for
reinforcement. In most cases, this means that rebar should be encased 3 inches in concrete. If the
concrete is not in direct contact with soil/weather, then the encasement can be less than 3 inches.
What is the minimum required thickness for a slab?
3 ½"
Explanation:
Although most concrete slabs are 4", according to code the minimum permissible thickness for the
slab is 3 ½".
1|Page
,From an engineering perspective, concrete has the advantage of high compressive strength. Maximum
strength is reached after:
28 days
The average deadload of dry concrete, including reinforcement, is:
150 lbs/sq ft.
Green concrete is:
Concrete that has been treated for water exposure
Which of the following has the highest Load Bearing-Value?
Bedrock
What size is the #3 rebar?
3/8"
Explanation:
The rebar comes with 1/8" increments. #1 rebar is 1/8", whereas #3 rebar is 3/8" thick.
The concrete stem walls must have #4 rebar ___ from the top of the footing as well as ___ from the
bottom of the footing.
3"
What is the minimum depth of a footing below the soil?
12"
What is the maximum spacing of the anchor bolts for 1-story house?
6' o. c.
It is important to keep the work site tidy and clear of debris, especially used lumber and used forms.
Why?
To reduce risk of accidents.
What is the minimum width of the footing for a 1-story house?
12"
What is the maximum spacing of the anchor bolts for a 2-story house?
4' o. c.
High-early:
Is cured after 7 days.
Proper curing is essential. What factors are most important to consider?
2|Page
,There are many factors, each with appropriate responses
What is the maximum spacing of control joints in driveways?
20'
Explanation:
The control joints in driveways should be spaced equal to the width of the slab, but the maximum
permissible spacing is 20 feet.
If the concrete costs $90 per cubic yard, how much would you pay for 2 ½ cubic yards of concrete with a
8.75% CA sales tax?
$244.69
Explanation:
Calculate the price of the concrete for 2 ½ cubic yards.$90 x 2.5 = $225.00Calculate the sales tax.$225
x 8.75% (or 0.0875) = $19.69Calculate the total price including the sales tax.$225 + $19.69 = $244.69
What is the volume of a cylinder if the diameter equals 3 feet and the length equals to 12 feet?
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?
In round columns
Control joints in sidewalks should be spaced at what intervals?
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.
3|Page
, One cubic foot of cement weighs approximately:
95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15 feet?
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:
+/- 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?
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?
Never
Tensile strength in concrete is achieved by:
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?
$6524.90
Explanation:
4|Page
TEST 1,2,3 AND 4 2025 EXAM 2024-2025 WITH
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|FREQUENTLY TESTED QUESTIONS AND
SOLUTIONS |ALREADY GRADED A+|BRAND
NEW!!!|LATEST UPDATE |GUARANTEED
PASS
What is the concrete mixture ratio of 1:2:4?
Standard
Explanation:
The mixture ratio of 1:2:4 stands for 1 part cement, 2 parts of sand or fine aggregate, and 3 parts of
coarse aggregate.Here is all of the mixture ratios:Lean 1:3:6Medium 1:2 ½:5Standard 1:2:4Rich 1:2:3
What is the minimum concrete cover, if rebar is cast against and permanently exposed to earth?
3 inches
Explanation:
Concrete cover as protection of reinforcement against weather and other effects is measured from
the concrete surface to the outermost surface of the steel. This is also known as concrete tolerance for
reinforcement. In most cases, this means that rebar should be encased 3 inches in concrete. If the
concrete is not in direct contact with soil/weather, then the encasement can be less than 3 inches.
What is the minimum required thickness for a slab?
3 ½"
Explanation:
Although most concrete slabs are 4", according to code the minimum permissible thickness for the
slab is 3 ½".
1|Page
,From an engineering perspective, concrete has the advantage of high compressive strength. Maximum
strength is reached after:
28 days
The average deadload of dry concrete, including reinforcement, is:
150 lbs/sq ft.
Green concrete is:
Concrete that has been treated for water exposure
Which of the following has the highest Load Bearing-Value?
Bedrock
What size is the #3 rebar?
3/8"
Explanation:
The rebar comes with 1/8" increments. #1 rebar is 1/8", whereas #3 rebar is 3/8" thick.
The concrete stem walls must have #4 rebar ___ from the top of the footing as well as ___ from the
bottom of the footing.
3"
What is the minimum depth of a footing below the soil?
12"
What is the maximum spacing of the anchor bolts for 1-story house?
6' o. c.
It is important to keep the work site tidy and clear of debris, especially used lumber and used forms.
Why?
To reduce risk of accidents.
What is the minimum width of the footing for a 1-story house?
12"
What is the maximum spacing of the anchor bolts for a 2-story house?
4' o. c.
High-early:
Is cured after 7 days.
Proper curing is essential. What factors are most important to consider?
2|Page
,There are many factors, each with appropriate responses
What is the maximum spacing of control joints in driveways?
20'
Explanation:
The control joints in driveways should be spaced equal to the width of the slab, but the maximum
permissible spacing is 20 feet.
If the concrete costs $90 per cubic yard, how much would you pay for 2 ½ cubic yards of concrete with a
8.75% CA sales tax?
$244.69
Explanation:
Calculate the price of the concrete for 2 ½ cubic yards.$90 x 2.5 = $225.00Calculate the sales tax.$225
x 8.75% (or 0.0875) = $19.69Calculate the total price including the sales tax.$225 + $19.69 = $244.69
What is the volume of a cylinder if the diameter equals 3 feet and the length equals to 12 feet?
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?
In round columns
Control joints in sidewalks should be spaced at what intervals?
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.
3|Page
, One cubic foot of cement weighs approximately:
95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15 feet?
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:
+/- 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?
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?
Never
Tensile strength in concrete is achieved by:
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?
$6524.90
Explanation:
4|Page
