CSLB Concrete C8 License Practice Test #1 (Latest
Update) Real Questions and Verified
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Terms in this set (87)
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
What is the volume of a
and radius (r) = 1.5 feet (half of the diameter
cylinder if the diameter
length)Area = 3.14 x 1.5 x 1.5Area = 7.065 sq. ft.Multiply
equals 3 feet and the
area by the length to find the volume.7.065 x 12 =
length equals to 12 feet?
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 In round columns
used?
, Equal to the width of the slab
Control joints in sidewalks
Explanation:
should be spaced at what
Generally the control joints in sidewalks should be
intervals?
spaced equal to the width of the slab, but not more
than 6 feet apart.
One cubic foot of cement 95 lbs
weighs approximately:
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
How many cubic yard of feet.176.625 x .333 = 58.82 cubic feetConvert cubic
concrete is required for a feet into cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince
4" slab with the diameter 2.18 is not a given option, round up the number to 2.5
of 15 feet? 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 +/- 2 inches
the location of bends and
ends of reinforcing bar is:
, 789.72
Explanation:
Step 1. Find the net face area of the trench deducting
How many cubic yards of
for pipe.Face area including pipe: 3 x 5 = 15 square
backfill are required for a
feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A =
3' x 5' trench, 1500 ft long,
0.785Find the face area of the trench minus area of the
with a 1 foot diameter
pipe, which will give you the net area for the
pipe?
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 Never
calculated by multiplying
the height, width and
length of a pour and
dividing by the deadload?
Tensile strength in The use of steel reinforcement.
concrete is achieved by:
$6524.90
Explanation:
The easiest way to solve for the area of the slab is to
Refer to the house plan. image a full rectangle of the slab and subtract void
What is the total cost for areas from the area of the slab.
the foundation slab if the
contractor charges $3.54 Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void
per square foot? 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
Update) Real Questions and Verified
Answers | 100% Correct | Already Graded A+
Save
Terms in this set (87)
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
What is the volume of a
and radius (r) = 1.5 feet (half of the diameter
cylinder if the diameter
length)Area = 3.14 x 1.5 x 1.5Area = 7.065 sq. ft.Multiply
equals 3 feet and the
area by the length to find the volume.7.065 x 12 =
length equals to 12 feet?
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 In round columns
used?
, Equal to the width of the slab
Control joints in sidewalks
Explanation:
should be spaced at what
Generally the control joints in sidewalks should be
intervals?
spaced equal to the width of the slab, but not more
than 6 feet apart.
One cubic foot of cement 95 lbs
weighs approximately:
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
How many cubic yard of feet.176.625 x .333 = 58.82 cubic feetConvert cubic
concrete is required for a feet into cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince
4" slab with the diameter 2.18 is not a given option, round up the number to 2.5
of 15 feet? 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 +/- 2 inches
the location of bends and
ends of reinforcing bar is:
, 789.72
Explanation:
Step 1. Find the net face area of the trench deducting
How many cubic yards of
for pipe.Face area including pipe: 3 x 5 = 15 square
backfill are required for a
feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A =
3' x 5' trench, 1500 ft long,
0.785Find the face area of the trench minus area of the
with a 1 foot diameter
pipe, which will give you the net area for the
pipe?
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 Never
calculated by multiplying
the height, width and
length of a pour and
dividing by the deadload?
Tensile strength in The use of steel reinforcement.
concrete is achieved by:
$6524.90
Explanation:
The easiest way to solve for the area of the slab is to
Refer to the house plan. image a full rectangle of the slab and subtract void
What is the total cost for areas from the area of the slab.
the foundation slab if the
contractor charges $3.54 Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void
per square foot? 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
