1 | Page
CSLB B LICENSE GENERAL
CONTRACTOR EXAM Questions and
Correct 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
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"
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, 2 | Page
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
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
© 2025 All rights reserved
, 3 | Page
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
C. Extra strength vitrified clay
D. Copper Ans: — Copper
Where do you need a fire wall?
© 2025 All rights reserved
, 4 | Page
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
C. Windows
D. Slabs Ans: — Windows.
© 2025 All rights reserved
CSLB B LICENSE GENERAL
CONTRACTOR EXAM Questions and
Correct 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
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"
© 2025 All rights reserved
, 2 | Page
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
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
© 2025 All rights reserved
, 3 | Page
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
C. Extra strength vitrified clay
D. Copper Ans: — Copper
Where do you need a fire wall?
© 2025 All rights reserved
, 4 | Page
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
C. Windows
D. Slabs Ans: — Windows.
© 2025 All rights reserved
