CSLB B LICENSE GENERAL CONTRACTOR EXAM LATEST 2025/2026 UPDATE EXAM REVIEW|
QUESTIONS AND DETAILED ANSWERS| 100% CORRECT| GRADE A+ |100% PASS
If unused mortar stiffens due to hydration of cement, what must you do? - ANSWER Discard the mortar
What minimum time must you wait before caulking or grouting new tiles? - ANSWER 24-48 Hours
How long should you wait before installing tile on a shower pan? - ANSWER 24 Hours
When would you wet brick masonry? - ANSWER Before building a brick wall in warm weather.
Which of the following does NOT need a fixed lighting outlet?
A. Bedroom ceiling
B. Furnace space and attic
C. Stairway
D. Exterior door - ANSWER Exterior door
How many days should you wait between the brown coat and the finish coat when plastering? -
ANSWER 7 days between BROWN coat and the FINISH coat.
How many days in advance must you notify authorities before digging an excavation 5' deep into which
a worker must go? - ANSWER 2 days
How do you decide which metal bracket to use? - ANSWER Per specification in the construction
documents.
How would you best determine if a soil is expansive? - ANSWER Have the soil tested
Where would be the best place to look for a roof leak? - ANSWER Valley flashings are the best place to
look for a roof leak.
,What is the purpose of a condenser line for a furnace vent fan? - ANSWER Help remove accumulated
water in the vent.
What is a register used for? - ANSWER A register is used to supply air.
The safety valve on a portable air compressor should be popped at least: - ANSWER The safety valve on
a portable air compressor should be popped at least weekly.
Which of the following materials is acceptable for interior gas lines?
A. Copper
B. PVC
C. Iron or steel
D. ABS - ANSWER Iron or steel is acceptable for interior gas lines.
If a circular slab is a 45' in diameter, how much surface area does it cover? - ANSWER Over 1,500 feet
What material do you use to clean brushes and spills when painting with alkyd (oil) paints? - ANSWER
Paint thinner is to be used to clean up oil based paints and stains.
Fiberglass insulation for walls should be attached to:
A. The interior of the studs
B. The face of the studs
C. The top and bottom of the studs
D. There is no need to attach - ANSWER There is no need to attach.
Basement concrete walls should have a minimum test PSI at 30 days of: - ANSWER A basement concrete
wall should have a minimum of 3000 psi after 30 days.
, Unstable dry rock, angular gravel, sandy loam, and cohesive soils having compressive strengths greater
than 0.5 and less than 1.5 tons/sq ft (tsf), are typical examples of: - ANSWER Type-B Soils
If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each light? - ANSWER
35V In a series circuit, the total voltage is divided equally.
For safety reasons, the maximum simple slope of an excavation, up to 20 ft deep, in Type-B soil is: -
ANSWER 1:1 (45°)
A Pittsburgh joint is used in: - ANSWER HVAC ductwork
The drain for a pressure relief valve on a water heater should be extended to: - ANSWER The outside of
the building
What is the minimum slope toward the drain of a shower pan? - ANSWER 1/4" per foot (2%)
What is the diameter of #3 rebar? - ANSWER 3/8"
If a vendor fails to provide an MSDS, you have the right to call: - ANSWER Cal/OSHA or DOSH
When installing a door jamb, you need shims at: - ANSWER Both hinge and strike sides, three on each
side.
Which of the following is used to adhere vinyl floors?
A. Epoxy cement
B. Asphalt mastic
C. Latex primer
D. White glue - ANSWER Epoxy cement
When do you need bracing for a drywall wall? - ANSWER Diagonal bracing is needed every 25' for any
drywall wall.
, How should you clear the roots from a construction site? - ANSWER Clear roots to 12" below grade.
Dividing watts by amps gives you: - ANSWER Volts
The most frequent on-the-job roofing accidents are: - ANSWER Falls
Which of the following is NOT a type of wood block flooring?
A. Parquet
B. Wood Mosaic
C. Wood Tile
D. All of the above. - ANSWER Wood tile
Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings - ANSWER Second floor decking
The tool used to carry grout needed to patch a small hole is a:
A. Hawk
B. Poling board
C. Spot board
D. Mason's scutch - ANSWER Spot Board
Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
C. Extra strength vitrified clay
QUESTIONS AND DETAILED ANSWERS| 100% CORRECT| GRADE A+ |100% PASS
If unused mortar stiffens due to hydration of cement, what must you do? - ANSWER Discard the mortar
What minimum time must you wait before caulking or grouting new tiles? - ANSWER 24-48 Hours
How long should you wait before installing tile on a shower pan? - ANSWER 24 Hours
When would you wet brick masonry? - ANSWER Before building a brick wall in warm weather.
Which of the following does NOT need a fixed lighting outlet?
A. Bedroom ceiling
B. Furnace space and attic
C. Stairway
D. Exterior door - ANSWER Exterior door
How many days should you wait between the brown coat and the finish coat when plastering? -
ANSWER 7 days between BROWN coat and the FINISH coat.
How many days in advance must you notify authorities before digging an excavation 5' deep into which
a worker must go? - ANSWER 2 days
How do you decide which metal bracket to use? - ANSWER Per specification in the construction
documents.
How would you best determine if a soil is expansive? - ANSWER Have the soil tested
Where would be the best place to look for a roof leak? - ANSWER Valley flashings are the best place to
look for a roof leak.
,What is the purpose of a condenser line for a furnace vent fan? - ANSWER Help remove accumulated
water in the vent.
What is a register used for? - ANSWER A register is used to supply air.
The safety valve on a portable air compressor should be popped at least: - ANSWER The safety valve on
a portable air compressor should be popped at least weekly.
Which of the following materials is acceptable for interior gas lines?
A. Copper
B. PVC
C. Iron or steel
D. ABS - ANSWER Iron or steel is acceptable for interior gas lines.
If a circular slab is a 45' in diameter, how much surface area does it cover? - ANSWER Over 1,500 feet
What material do you use to clean brushes and spills when painting with alkyd (oil) paints? - ANSWER
Paint thinner is to be used to clean up oil based paints and stains.
Fiberglass insulation for walls should be attached to:
A. The interior of the studs
B. The face of the studs
C. The top and bottom of the studs
D. There is no need to attach - ANSWER There is no need to attach.
Basement concrete walls should have a minimum test PSI at 30 days of: - ANSWER A basement concrete
wall should have a minimum of 3000 psi after 30 days.
, Unstable dry rock, angular gravel, sandy loam, and cohesive soils having compressive strengths greater
than 0.5 and less than 1.5 tons/sq ft (tsf), are typical examples of: - ANSWER Type-B Soils
If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each light? - ANSWER
35V In a series circuit, the total voltage is divided equally.
For safety reasons, the maximum simple slope of an excavation, up to 20 ft deep, in Type-B soil is: -
ANSWER 1:1 (45°)
A Pittsburgh joint is used in: - ANSWER HVAC ductwork
The drain for a pressure relief valve on a water heater should be extended to: - ANSWER The outside of
the building
What is the minimum slope toward the drain of a shower pan? - ANSWER 1/4" per foot (2%)
What is the diameter of #3 rebar? - ANSWER 3/8"
If a vendor fails to provide an MSDS, you have the right to call: - ANSWER Cal/OSHA or DOSH
When installing a door jamb, you need shims at: - ANSWER Both hinge and strike sides, three on each
side.
Which of the following is used to adhere vinyl floors?
A. Epoxy cement
B. Asphalt mastic
C. Latex primer
D. White glue - ANSWER Epoxy cement
When do you need bracing for a drywall wall? - ANSWER Diagonal bracing is needed every 25' for any
drywall wall.
, How should you clear the roots from a construction site? - ANSWER Clear roots to 12" below grade.
Dividing watts by amps gives you: - ANSWER Volts
The most frequent on-the-job roofing accidents are: - ANSWER Falls
Which of the following is NOT a type of wood block flooring?
A. Parquet
B. Wood Mosaic
C. Wood Tile
D. All of the above. - ANSWER Wood tile
Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings - ANSWER Second floor decking
The tool used to carry grout needed to patch a small hole is a:
A. Hawk
B. Poling board
C. Spot board
D. Mason's scutch - ANSWER Spot Board
Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
C. Extra strength vitrified clay
