California Concrete Contractor (C-8)
License Exam Practice Test Questions
And Correct Answers (Verified Answers)
Plus Rationales 2025 Q&A | Instant
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1. What is the primary purpose of using rebar in concrete construction?
A. Reduce weight
B. Increase tensile strength
C. Improve finish
D. Accelerate curing
Rebar provides tensile strength to concrete, which is strong in
compression but weak in tension.
2. What slump is generally suitable for foundations and footings?
A. 1 inch
B. 2 inches
C. 4 inches
D. 7 inches
A 4-inch slump is typical for foundations, providing a good balance of
workability and strength.
,3. What is the minimum concrete cover for rebar in a slab that is not
exposed to weather or soil?
A. 1/2 inch
B. 3/4 inch
C. 1 inch
D. 2 inches
For slabs not exposed to weather, a 3/4-inch cover is usually
sufficient.
4. Which type of cement is most commonly used in residential concrete
work?
A. Type II
B. Type I
C. Type III
D. Type V
Type I cement is general-purpose and commonly used in most
residential projects.
5. Which test is used to measure the workability of fresh concrete?
A. Core test
B. Slump test
C. Load test
D. Penetration test
The slump test is a standard field test to determine the workability of
fresh concrete.
6. What is the minimum required compressive strength of concrete used
in footings?
A. 1500 psi
B. 2000 psi
C. 2500 psi
D. 3000 psi
, The California Building Code typically requires a minimum
compressive strength of 2500 psi for footings.
7. Which tool is used to level and smooth freshly poured concrete?
A. Trowel
B. Edger
C. Bull float
D. Screed
A screed is used to level the surface before floating or troweling.
8. Which component improves concrete's ability to resist freeze-thaw
cycles?
A. Retarder
B. Air-entrainment admixture
C. Accelerator
D. Plasticizer
Air-entrainment helps concrete resist damage from freezing and
thawing.
9. What is the proper sequence when placing concrete?
A. Screed, vibrate, pour
B. Pour, screed, trowel
C. Pour, vibrate, screed
D. Vibrate, pour, trowel
Concrete is poured, then vibrated to eliminate air pockets, and finally
screeded for leveling.
10. What happens if too much water is added to concrete?
A. Sets faster
B. Decreases strength
C. Becomes more durable
D. Increases tensile strength
License Exam Practice Test Questions
And Correct Answers (Verified Answers)
Plus Rationales 2025 Q&A | Instant
Download Pdf
1. What is the primary purpose of using rebar in concrete construction?
A. Reduce weight
B. Increase tensile strength
C. Improve finish
D. Accelerate curing
Rebar provides tensile strength to concrete, which is strong in
compression but weak in tension.
2. What slump is generally suitable for foundations and footings?
A. 1 inch
B. 2 inches
C. 4 inches
D. 7 inches
A 4-inch slump is typical for foundations, providing a good balance of
workability and strength.
,3. What is the minimum concrete cover for rebar in a slab that is not
exposed to weather or soil?
A. 1/2 inch
B. 3/4 inch
C. 1 inch
D. 2 inches
For slabs not exposed to weather, a 3/4-inch cover is usually
sufficient.
4. Which type of cement is most commonly used in residential concrete
work?
A. Type II
B. Type I
C. Type III
D. Type V
Type I cement is general-purpose and commonly used in most
residential projects.
5. Which test is used to measure the workability of fresh concrete?
A. Core test
B. Slump test
C. Load test
D. Penetration test
The slump test is a standard field test to determine the workability of
fresh concrete.
6. What is the minimum required compressive strength of concrete used
in footings?
A. 1500 psi
B. 2000 psi
C. 2500 psi
D. 3000 psi
, The California Building Code typically requires a minimum
compressive strength of 2500 psi for footings.
7. Which tool is used to level and smooth freshly poured concrete?
A. Trowel
B. Edger
C. Bull float
D. Screed
A screed is used to level the surface before floating or troweling.
8. Which component improves concrete's ability to resist freeze-thaw
cycles?
A. Retarder
B. Air-entrainment admixture
C. Accelerator
D. Plasticizer
Air-entrainment helps concrete resist damage from freezing and
thawing.
9. What is the proper sequence when placing concrete?
A. Screed, vibrate, pour
B. Pour, screed, trowel
C. Pour, vibrate, screed
D. Vibrate, pour, trowel
Concrete is poured, then vibrated to eliminate air pockets, and finally
screeded for leveling.
10. What happens if too much water is added to concrete?
A. Sets faster
B. Decreases strength
C. Becomes more durable
D. Increases tensile strength
