CSLB B LICENSE GENERAL
CONTRACTOR EXAM 2025 QUESTIONS
AND ANSWERS
If unused mortar stiffens due to hydration of cement, what must you do? - ANS Discard the
mortar
What minimum time must you wait before caulking or grouting new tiles? - ANS 24-48 Hours
How long should you wait before installing tile on a shower pan? - ANS 24 Hours
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: - ANS Type-B Soils
If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each light? -
ANS 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: - ANS 1:1 (45°)
A Pittsburgh joint is used in: - ANS HVAC ductwork
1 @COPYRIGHT THESTAR 2025/2026
,The drain for a pressure relief valve on a water heater should be extended to: - ANS The
outside of the building
What is the minimum slope toward the drain of a shower pan? - ANS 1/4" per foot (2%)
What is the diameter of #3 rebar? - ANS 3/8"
If a vendor fails to provide an MSDS, you have the right to call: - ANS Cal/OSHA or DOSH
When installing a door jamb, you need shims at: - ANS 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 - ANS Epoxy cement
When do you need bracing for a drywall wall? - ANS Diagonal bracing is needed every 25' for
any drywall wall.
How should you clear the roots from a construction site? - ANS Clear roots to 12" below
grade.
Dividing watts by amps gives you: - ANS Volts
2 @COPYRIGHT THESTAR 2025/2026
,The most frequent on-the-job roofing accidents are: - ANS 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. - ANS Wood tile
Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings - ANS 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 - ANS Spot Board
Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
3 @COPYRIGHT THESTAR 2025/2026
, C. Extra strength vitrified clay
D. Copper - ANS Copper
Where do you need a fire wall?
A. Between a living room and a bedroom
B. Between a bedroom and a bathroom
C. Between a kitchen and a bath
D. A separation wall between a dwelling and an attachment - ANS A separation wall between
a dwelling and an attachment.
What is the minimum clearance between rough ground and untreated subfloor joists? -
ANS 18 inches
Who may remove asbestos? - ANS Contractor with Asbestos Certification on license.
Which of the following is NOT likely to be found in significant proportions in granular soil?
A. Gravel
B. Sand
C. Silt
D. Clay - ANS Clay
Stiles and rails are used on which of the following?
A. Furred walls
B. Roofs
4 @COPYRIGHT THESTAR 2025/2026
CONTRACTOR EXAM 2025 QUESTIONS
AND ANSWERS
If unused mortar stiffens due to hydration of cement, what must you do? - ANS Discard the
mortar
What minimum time must you wait before caulking or grouting new tiles? - ANS 24-48 Hours
How long should you wait before installing tile on a shower pan? - ANS 24 Hours
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: - ANS Type-B Soils
If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each light? -
ANS 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: - ANS 1:1 (45°)
A Pittsburgh joint is used in: - ANS HVAC ductwork
1 @COPYRIGHT THESTAR 2025/2026
,The drain for a pressure relief valve on a water heater should be extended to: - ANS The
outside of the building
What is the minimum slope toward the drain of a shower pan? - ANS 1/4" per foot (2%)
What is the diameter of #3 rebar? - ANS 3/8"
If a vendor fails to provide an MSDS, you have the right to call: - ANS Cal/OSHA or DOSH
When installing a door jamb, you need shims at: - ANS 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 - ANS Epoxy cement
When do you need bracing for a drywall wall? - ANS Diagonal bracing is needed every 25' for
any drywall wall.
How should you clear the roots from a construction site? - ANS Clear roots to 12" below
grade.
Dividing watts by amps gives you: - ANS Volts
2 @COPYRIGHT THESTAR 2025/2026
,The most frequent on-the-job roofing accidents are: - ANS 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. - ANS Wood tile
Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings - ANS 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 - ANS Spot Board
Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
3 @COPYRIGHT THESTAR 2025/2026
, C. Extra strength vitrified clay
D. Copper - ANS Copper
Where do you need a fire wall?
A. Between a living room and a bedroom
B. Between a bedroom and a bathroom
C. Between a kitchen and a bath
D. A separation wall between a dwelling and an attachment - ANS A separation wall between
a dwelling and an attachment.
What is the minimum clearance between rough ground and untreated subfloor joists? -
ANS 18 inches
Who may remove asbestos? - ANS Contractor with Asbestos Certification on license.
Which of the following is NOT likely to be found in significant proportions in granular soil?
A. Gravel
B. Sand
C. Silt
D. Clay - ANS Clay
Stiles and rails are used on which of the following?
A. Furred walls
B. Roofs
4 @COPYRIGHT THESTAR 2025/2026
