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CSLB B License General Contractor Exam | California Class B Practice Questions & Exam Prep 2026–2027

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Prepare for the California CSLB B License General Contractor exam with focused coverage of general building construction, project management, construction law, building codes, estimating, contracts, safety regulations, construction materials, and core trade knowledge. This 2026–2027 exam preparation resource is designed for candidates reviewing the key concepts and practical knowledge associated with the California Class B General Building Contractor licensing examination.

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CSLB B LICENSE GENERAL CONTRACTOR EXAM
CSLB B LICENSE GENERAL CONTRACTOR EXAM CSLB B LICENSE GENERAL CONTRACTOR EXAM


CSLB B LICENSE GENERAL CONTRACTOR EXAM

CSLB B LICENSE GENERAL CONTRACTOR EXAM


If 65 street lights are fed by a 2275 volt series circuit, what 35V
is the voltage across each light?
In a series circuit, the total voltage is divided equally.


What minimum time must you wait before caulking or 24-48 Hours
grouting new tiles?



How long should you wait before installing tile on a shower 24 Hours
pan?



Unstable dry rock, angular gravel, sandy loam, and Type-B Soils
cohesive soils having compressive strengths greater than
0.5 and less than 1.5 tons/sq ft (tsf), are typical examples
of:


For safety reasons, the maximum simple slope of an 1:1 (45°)
excavation, up to 20 ft deep, in Type-B soil is:



A Pittsburgh joint is used in: HVAC ductwork




The drain for a pressure relief valve on a water heater The outside of the building
should be extended to:



What is the minimum slope toward the drain of a shower 1/4" per foot (2%)
pan?



What is the diameter of #3 rebar? 3/8"




If a vendor fails to provide an MSDS, you have the right to Cal/OSHA or DOSH
call:



When installing a door jamb, you need shims at: Both hinge and strike sides, three on each side.




Which of the following is used to adhere vinyl floors? Epoxy cement

A. Epoxy cement
B. Asphalt mastic
C. Latex primer
D. White glue


When do you need bracing for a drywall wall? Diagonal bracing is needed every 25' for any drywall wall.

, CSLB B LICENSE GENERAL CONTRACTOR EXAM
How should you clear the roots from a construction site? Clear roots to 12" below grade.




Dividing watts by amps gives you: Volts




The most frequent on-the-job roofing accidents are: Falls




Which of the following is NOT a type of wood block Wood tile
flooring?

A. Parquet
B. Wood Mosaic
C. Wood Tile
D. All of the above.


Lightweight concrete is best used for: Second floor decking

A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings


The tool used to carry grout needed to patch a small hole Spot Board
is a:

A. Hawk
B. Poling board
C. Spot board
D. Mason's scutch


Which pipe is NOT appropriate for industrial wastes? Copper

A. Cast iron
B. Schedule 40 ABS DWV
C. Extra strength vitrified clay
D. Copper


Where do you need a fire wall? A separation wall between a dwelling and an attachment.

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


What is the minimum clearance between rough ground 18 inches
and untreated subfloor joists?



Who may remove asbestos? Contractor with Asbestos Certification on license.




Which of the following is NOT likely to be found in Clay
significant proportions in granular soil?

A. Gravel
B. Sand
C. Silt
D. Clay

, CSLB B LICENSE GENERAL CONTRACTOR EXAM
Stiles and rails are used on which of the following? Windows.

A. Furred walls A stile is the vertical edges of the window and the rails are the bottom and top.
B. Roofs
C. Windows
D. Slabs


What does a high slump test indicate? Too much water.




Metal concrete forms should be? Oiled

A. Oiled
B. Watered
C. Placed against gravel
D. Discarded after each use


What does the R mean in a description of insulation? Resistance




What kind of door would you install for someone with a Either A or C
disability?

A. Automatic with minimum of 3 seconds to close
B. Automatic with maximum of 5 seconds to open
C. Manual with maximum of 8.5 pounds to operate
D. Either A or C


Triple-walled metal chimney installations are regulated by: 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 You encounter an unfamiliar trade.
contractor when:



When a stairway serves a public building, what is the Two
minimum number of steps for which a handrail is required?



What is the minimum underlayment for asphalt shingles? 15 pounds




How long should you wait before sealing new tile work? 2 weeks




When do you install insulation? After the electrical and plumbing are approved.




When do you NOT need an exhaust fan in a bathroom? When there is a window in the bathroom.




What is a bush-hammer used for? Roughen surface of hardened concrete.

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