1
CSLB CONCRETE C8 LICENSE PRACTICE TEST 1|
QUESTIONS AND CORRECT ANSWERS WITH
EXPLANATIONS | GRADED A+ | VERIFIED ANSWERS |
LATEST VERSION
What is the volume of a cylinder if the diameter equals 3 feet and the length
equals to 12 feet? - (answers)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? - (answers)In round columns
Control joints in sidewalks should be spaced at what intervals? - (answers)Equal
to the width of the slab
Explanation:
, 2
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: - (answers)95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15
feet? - (answers)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: -
(answers)+/- 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? - (answers)789.72
, 3
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? - (answers)Never
Tensile strength in concrete is achieved by: - (answers)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? - (answers)$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 =
1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90
CSLB CONCRETE C8 LICENSE PRACTICE TEST 1|
QUESTIONS AND CORRECT ANSWERS WITH
EXPLANATIONS | GRADED A+ | VERIFIED ANSWERS |
LATEST VERSION
What is the volume of a cylinder if the diameter equals 3 feet and the length
equals to 12 feet? - (answers)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? - (answers)In round columns
Control joints in sidewalks should be spaced at what intervals? - (answers)Equal
to the width of the slab
Explanation:
, 2
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: - (answers)95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15
feet? - (answers)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: -
(answers)+/- 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? - (answers)789.72
, 3
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? - (answers)Never
Tensile strength in concrete is achieved by: - (answers)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? - (answers)$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 =
1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90
