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CSLB CONCRETE C8 LICENSE PRACTICE TEST 1,2,3
AND 4 LATEST 2025/ 2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||VERIFIED EXAM!!!|| ||LATEST EXAM!!!||
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
,2|Page
.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:
,3|Page
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: - 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:
, 4|Page
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:
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.
CSLB CONCRETE C8 LICENSE PRACTICE TEST 1,2,3
AND 4 LATEST 2025/ 2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||VERIFIED EXAM!!!|| ||LATEST EXAM!!!||
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
,2|Page
.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:
,3|Page
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: - 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:
, 4|Page
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:
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.
