CSLB Concrete C8 License Practice Test #1
Questions With Correct Answers
What is the volume of a cylinder if the diameter equals 3 feet and the length
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equals to 12 feet? - CORRECT ANSWER✔✔-84.78 cubic feet
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Explanation:
There are two ways to solve the problem. However, regardless of which method is
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|used, you need to first determine the area of the circle then multiply it by the
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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
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x 1.5 x 1.5Area = 7.065 sq. ft.Multiply area by the length to find the volume.7.065
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|x 12 = 84.78Shortcut MethodArea of the circle is 78.5% of the square. Treat the
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circle as a square and solve for the area.Find the area of the square instead of the
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|circle.3' x 3' = 9 sq. ft.Since circle is 78.5% of the square, multiply area of the
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square by 78.5% (or .785 if there is no percentage sign on the calculator).9 sq. ft.
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x .785 = 7.065 square feetMultiply area by the length to find the volume.7.065 x
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12 = 84.78 cubic feet
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Where are spiral rebar ties used? - CORRECT ANSWER✔✔-In round columns
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Control joints in sidewalks should be spaced at what intervals? - CORRECT
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ANSWER✔✔-Equal to the width of the slab | | | | | |
Explanation:
,Generally the control joints in sidewalks should be spaced equal to the width of
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the slab, but not more than 6 feet apart.
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One cubic foot of cement weighs approximately: - CORRECT ANSWER✔✔-95 lbs
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How many cubic yard of concrete is required for a 4" slab with the diameter of 15
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feet? - CORRECT ANSWER✔✔-2 ½ cubic yards
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Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π
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|= 3.14 and radius (r) = 7.5 feet (half of the diameter length)Area = 3.14 x 7.5 x
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7.5Area = 176.625 sq. ft.Multiply area by the depth of the slab (in feet) to find the
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|volume in cubic feet.176.625 x .333 = 58.82 cubic feetConvert cubic feet into
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cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince 2.18 is not a given option, round
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up the number to 2.5 cubic yardsShortcut MethodThis problem can be solved
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using a much simpler method. First is to find the area of the square, then convert
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it into the area of the circle by multiplying it by 78.5%.Area of the square = 15' x
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15' = 225 square feetArea of the circle = 225 x .785 = 176.625 square feetDivide
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the volume by 81 to solve for the cubic yards for a 4" slab.176.625 ÷ 81 = 2.18
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cubic yardsSince 2.18 is not a given option, round up the number to 2.5 cubic
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yards
The normal tolerance for the location of bends and ends of reinforcing bar is: -
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CORRECT ANSWER✔✔-+/- 2 inches | | |
How many cubic yards of backfill are required for a 3' x 5' trench, 1500 ft long,
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with a 1 foot diameter pipe? - CORRECT ANSWER✔✔-789.72
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, Explanation:
Step 1. Find the net face area of the trench deducting for pipe.Face area including
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pipe: 3 x 5 = 15 square feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A = 0.785Find
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the face area of the trench minus area of the pipe, which will give you the net
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area for the backfill.15 - 0.785 = 14.215Step 2. Find the total volume of the
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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
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of a pour and dividing by the deadload? - CORRECT ANSWER✔✔-Never
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Tensile strength in concrete is achieved by: - CORRECT ANSWER✔✔-The use of
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steel reinforcement.
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Refer to the house plan. What is the total cost for the foundation slab if the
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contractor charges $3.54 per square foot? - CORRECT ANSWER✔✔-$6524.90
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Explanation:
The easiest way to solve for the area of the slab is to image a full rectangle of the
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slab and subtract void areas from the area of the slab.
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Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2
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sq ftCenter void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' =
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137.505Net area of the foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 =
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1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90
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Questions With Correct Answers
What is the volume of a cylinder if the diameter equals 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 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.
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x .785 = 7.065 square feetMultiply area by the length to find the volume.7.065 x
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12 = 84.78 cubic feet
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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. 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? - CORRECT ANSWER✔✔-Never
| | | | | | | | | |
Tensile strength in concrete is achieved by: - CORRECT 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? - 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 =
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1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90
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