CSLB CONCRETE C8 LICENSE PRACTICE TEST - QUESTIONS WITH 100- CORRECT

CSLB CONCRETE C8 LICENSE PRACTICETEST #1 v v v v v v




2024-2025 QUESTIONS WITH 100% CORRECT
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ANSWERS
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What is the volume of a cylinder if the diameter equals 3 feet and the length equals to 12 feet? - correct
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answer-84.78 cubic feet
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Explanation:
There are two ways to solve the problem. However, regardless of which method is used, you needPto first
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determine the areaPof the circle then multiply it by the length.Traditional MethodUse the following formul
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a:Area of the circle = π x r x rWhere πP= 3.14 and radius (r) = 1.5 feet (half of the diameter length)Area =
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3.14 x 1.5 x 1.5AreaP= 7.065 sq. ft.Multiply area by the length to find the volume.7.065 x 12 = 84.78Short cut
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MethodArea of the circle is 78.5% of the square. Treat the circle as a square and solve for the area.Fin d the area
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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
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by 78.5% (or .785 if there is no percentage sign on the calculator).9 sq. ft. x .785 = 7.06 5 square feetMultiply
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area by the length to find the volume.7.065 x 12 = 84.78 cubic feet
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WherePare spiral rebar ties used? - correct answer-In round columns v v v v v v v v v




Control joints in sidewalks should be spaced at what intervals? - correct answer-
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Equal to the width of the slab
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Explanation:
Generally the control joints in sidewalks should be spacedPequal to the width of the slab, but not more tha n 6
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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 feet? - correct answer- 2 ½
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cubic yards
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Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14Pand radius (r)
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= 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 d
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, epth of the slab (in feet) to find the volume in cubic feet.176.625 x .333 = 58.82 cubic feetConvert cubic f eet
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into cubic yards.58.82 ÷P27 = 2.18 cubic yardsSince 2.18 is not a given option, round up the number t o 2.5
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cubic yardsShortcut MethodThis problem can be solvedPusing a much simpler method. First is to fin d the area
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of the square, then convert it into the area of the circle by multiplying it by 78.5%.Area of the s quare = 15' x 15'
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= 225 square feetArea of the circle = 225 x .785 = 176.625 square feetDivide the volume by 81 to solve for the
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cubic yards for a 4" slab.176.625 ÷ 81 = 2.18 cubic yardsSince 2.18 is not a givenP option, round up the
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number to 2.5 cubic yards
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The normal tolerance for the location of bends and ends of reinforcing bar is: - correct answer-+/- 2
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inches
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How many cubic yards of backfill are required for a 3' x 5' trench, 1500 ft long, with a 1 foot diameter pip e? -
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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 pipe: 3 x 5 = 15 square
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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,
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which will give you the net area for the backfill.15 -
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0.785 = 14.215Step 2. Find the total volume of the backfill.14.215 x 1500 = 21322.5 cubic feetConvert t he
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volume into cubic yards.21322.5 ÷ 27 = 789.72 cubic yards
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WhenPcanPthe live load be calculated by multiplying the height, width and length of a pour and dividing b y the
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deadload? - correct answer-Never
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Tensile strength in concrete is achieved by: - correct answer-The use of steel reinforcement.
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Refer to the house plan. What is the total cost for the foundation slab if the contractor charges $3.54 per s quare
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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 thePslab and subtract void ar eas
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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 sq ftCenter void area: 1
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1.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net areaPof the foundation slab: 2013.94
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- 12.2 - 21.045 - 137.505 = 1843.19 sq ft.Calculate thePprice of the slab.1843.19 sq ft x $3.54 = $6524.90
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