CSLB B LICENSE GENERAL CONTRACTOR EXAM
2025-2026 | 330 QUESTIONS WITH 100%
CORRECT ANSWERS.
If unused mortar stiffens due to hydration of cement, what must you do? - CORRECT
ANSWER->>Discard the mortar
What minimum time must you wait before caulking or grouting new tiles? - CORRECT
ANSWER->>24-48 Hours
How long should you wait before installing tile on a shower pan? - CORRECT
ANSWER->>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: -
CORRECT ANSWER->>Type-B Soils
If 65 street lights are fed by a 2275-volt series circuit, what is the voltage across each
light? - CORRECT 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: - CORRECT ANSWER->>1:1 (45°)
A Pittsburgh joint is used in: - CORRECT ANSWER->>HVAC ductwork
The drain for a pressure relief valve on a water heater should be extended to: -
CORRECT ANSWER->>The outside of the building
What is the minimum slope toward the drain of a shower pan? - CORRECT ANSWER-
>>1/4" per foot (2%)
What is the diameter of #3 rebar? - CORRECT ANSWER->>3/8"
If a vendor fails to provide an MSDS, you have the right to call: - CORRECT ANSWER-
>>Cal/OSHA or DOSH
When installing a door jamb, you need shims at: - CORRECT ANSWER->>Both hinge
and strike sides, three on each side.
,Which of the following is used to adhere vinyl floors?
Epoxy cement
Asphalt mastic
Latex primer
White glue - CORRECT ANSWER->>Epoxy cement
When do you need bracing for a drywall wall? - CORRECT ANSWER->>Diagonal
bracing is needed every 25' for any drywall wall.
How should you clear the roots from a construction site? - CORRECT ANSWER->>
Clear roots to 12" below grade.
Dividing watts by amps gives you: - CORRECT ANSWER->>Volts
The most frequent on-the-job roofing accidents are: - CORRECT ANSWER->>Falls
Which of the following is NOT a type of wood block flooring?
Parquet
Wood Mosaic
Wood Tile
All of the above. - CORRECT ANSWER->>Wood tile
Lightweight concrete is best used for:
Curb and Gutter
Second floor decking
First floor slab on grade
Footings - CORRECT ANSWER->>Second floor decking
The tool used to carry grout needed to patch a small hole is a:
Hawk
Poling board
Spot board
Mason's scutch - CORRECT ANSWER->>Spot Board
Which pipe is NOT appropriate for industrial wastes?
Cast iron
Schedule 40 ABS DWV
Extra strength vitrified clay
Copper - CORRECT ANSWER->>Copper
Where do you need a fire wall?
Between a living room and a bedroom
Between a bedroom and a bathroom
Between a kitchen and a bath
A separation wall between a dwelling and an attachment - Correct Answer
-A separation wall between a dwelling and an attachment.
,What is the minimum clearance between rough ground and untreated subfloor joists?
- CORRECT ANSWER->>18 inches
Who may remove asbestos? - CORRECT ANSWER->>Contractor with Asbestos
Certification on license.
Which of the following is NOT likely to be found in significant proportions in granular
soil?
Gravel
Sand
Silt
Clay - CORRECT ANSWER->>Clay
Stiles and rails are used on which of the following?
Furred walls
Roofs
Windows
Slabs - CORRECT ANSWER->>Windows.
A stile is the vertical edges of the window and the rails are the bottom and top. What
does a high slump test indicate? - CORRECT ANSWER->>Too much water.
Metal concrete forms should be?
Oiled
Watered
Placed against gravel
Discarded after each use - CORRECT ANSWER->>Oiled
What does the R mean in a description of insulation? - CORRECT ANSWER->>
Resistance
What kind of door would you install for someone with a disability?
Automatic with minimum of 3 seconds to close
Automatic with maximum of 5 seconds to open
Manual with maximum of 8.5 pounds to operate
Either A or C - CORRECT ANSWER->>Either A or C
, Triple-walled metal chimney installations are regulated by: - Correct Answer – ICC
ICC-IBC-IRC is the international code council. IBC is international building code
commercial. IRC is the international residential code.
If you are a general contractor, you should call a specialty contractor when: -
CORRECT ANSWER->>You encounter an unfamiliar trade.
When a stairway serves a public building, what is the minimum number of steps for
which a handrail is required? - CORRECT ANSWER->>Two
What is the minimum underlayment for asphalt shingles? - CORRECT ANSWER->> 15
pounds
How long should you wait before sealing new tile work? - CORRECT ANSWER->>2
weeks
When do you install insulation? - CORRECT ANSWER->>After the electrical and
plumbing are approved.
When do you NOT need an exhaust fan in a bathroom? - CORRECT ANSWER->>
When there is a window in the bathroom.
What is a bush-hammer used for? - CORRECT ANSWER->>Roughen surface of
hardened concrete.
When you say a wall is perfect it is: - CORRECT ANSWER->>Both plumb and straight.
The purpose of a batter board in concrete work is: - CORRECT ANSWER->>Support
layout strings when location foundations.
What is the difference between a hip jack rafter and a common rafter? - CORRECT
ANSWER->>A hip jack runs from the top plate to a hip rafter, but a common rafter
runs to the ridge board.
When should you float a concrete surface? - CORRECT ANSWER->>As soon as the
water sheen evaporates
When installing drywall screws you should:
Countersink
2025-2026 | 330 QUESTIONS WITH 100%
CORRECT ANSWERS.
If unused mortar stiffens due to hydration of cement, what must you do? - CORRECT
ANSWER->>Discard the mortar
What minimum time must you wait before caulking or grouting new tiles? - CORRECT
ANSWER->>24-48 Hours
How long should you wait before installing tile on a shower pan? - CORRECT
ANSWER->>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: -
CORRECT ANSWER->>Type-B Soils
If 65 street lights are fed by a 2275-volt series circuit, what is the voltage across each
light? - CORRECT 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: - CORRECT ANSWER->>1:1 (45°)
A Pittsburgh joint is used in: - CORRECT ANSWER->>HVAC ductwork
The drain for a pressure relief valve on a water heater should be extended to: -
CORRECT ANSWER->>The outside of the building
What is the minimum slope toward the drain of a shower pan? - CORRECT ANSWER-
>>1/4" per foot (2%)
What is the diameter of #3 rebar? - CORRECT ANSWER->>3/8"
If a vendor fails to provide an MSDS, you have the right to call: - CORRECT ANSWER-
>>Cal/OSHA or DOSH
When installing a door jamb, you need shims at: - CORRECT ANSWER->>Both hinge
and strike sides, three on each side.
,Which of the following is used to adhere vinyl floors?
Epoxy cement
Asphalt mastic
Latex primer
White glue - CORRECT ANSWER->>Epoxy cement
When do you need bracing for a drywall wall? - CORRECT ANSWER->>Diagonal
bracing is needed every 25' for any drywall wall.
How should you clear the roots from a construction site? - CORRECT ANSWER->>
Clear roots to 12" below grade.
Dividing watts by amps gives you: - CORRECT ANSWER->>Volts
The most frequent on-the-job roofing accidents are: - CORRECT ANSWER->>Falls
Which of the following is NOT a type of wood block flooring?
Parquet
Wood Mosaic
Wood Tile
All of the above. - CORRECT ANSWER->>Wood tile
Lightweight concrete is best used for:
Curb and Gutter
Second floor decking
First floor slab on grade
Footings - CORRECT ANSWER->>Second floor decking
The tool used to carry grout needed to patch a small hole is a:
Hawk
Poling board
Spot board
Mason's scutch - CORRECT ANSWER->>Spot Board
Which pipe is NOT appropriate for industrial wastes?
Cast iron
Schedule 40 ABS DWV
Extra strength vitrified clay
Copper - CORRECT ANSWER->>Copper
Where do you need a fire wall?
Between a living room and a bedroom
Between a bedroom and a bathroom
Between a kitchen and a bath
A separation wall between a dwelling and an attachment - Correct Answer
-A separation wall between a dwelling and an attachment.
,What is the minimum clearance between rough ground and untreated subfloor joists?
- CORRECT ANSWER->>18 inches
Who may remove asbestos? - CORRECT ANSWER->>Contractor with Asbestos
Certification on license.
Which of the following is NOT likely to be found in significant proportions in granular
soil?
Gravel
Sand
Silt
Clay - CORRECT ANSWER->>Clay
Stiles and rails are used on which of the following?
Furred walls
Roofs
Windows
Slabs - CORRECT ANSWER->>Windows.
A stile is the vertical edges of the window and the rails are the bottom and top. What
does a high slump test indicate? - CORRECT ANSWER->>Too much water.
Metal concrete forms should be?
Oiled
Watered
Placed against gravel
Discarded after each use - CORRECT ANSWER->>Oiled
What does the R mean in a description of insulation? - CORRECT ANSWER->>
Resistance
What kind of door would you install for someone with a disability?
Automatic with minimum of 3 seconds to close
Automatic with maximum of 5 seconds to open
Manual with maximum of 8.5 pounds to operate
Either A or C - CORRECT ANSWER->>Either A or C
, Triple-walled metal chimney installations are regulated by: - Correct Answer – ICC
ICC-IBC-IRC is the international code council. IBC is international building code
commercial. IRC is the international residential code.
If you are a general contractor, you should call a specialty contractor when: -
CORRECT ANSWER->>You encounter an unfamiliar trade.
When a stairway serves a public building, what is the minimum number of steps for
which a handrail is required? - CORRECT ANSWER->>Two
What is the minimum underlayment for asphalt shingles? - CORRECT ANSWER->> 15
pounds
How long should you wait before sealing new tile work? - CORRECT ANSWER->>2
weeks
When do you install insulation? - CORRECT ANSWER->>After the electrical and
plumbing are approved.
When do you NOT need an exhaust fan in a bathroom? - CORRECT ANSWER->>
When there is a window in the bathroom.
What is a bush-hammer used for? - CORRECT ANSWER->>Roughen surface of
hardened concrete.
When you say a wall is perfect it is: - CORRECT ANSWER->>Both plumb and straight.
The purpose of a batter board in concrete work is: - CORRECT ANSWER->>Support
layout strings when location foundations.
What is the difference between a hip jack rafter and a common rafter? - CORRECT
ANSWER->>A hip jack runs from the top plate to a hip rafter, but a common rafter
runs to the ridge board.
When should you float a concrete surface? - CORRECT ANSWER->>As soon as the
water sheen evaporates
When installing drywall screws you should:
Countersink
