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General Contractor CSLB B Trade Exam latest With
Exam Questions and Correct Verified Answers/ CSLB
B Exam 2025- 2026 Preparation (new!)/ General
Contractor CSLB Trade Exam Graded A+
If unused mortar stiffens due to hydration of cement, what must you do? Discard the mortar What minimum time must you wait before caulking or grouting new tiles? 24 - 48 Hours How long should you wait before installing tile on a shower pan? 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: Type-B Soils If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each light? 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: 1:1 (45°) A Pittsburgh joint is used in: HVAC ductwork The drain for a pressure relief valve on a water heater should be extended to: The outside of the building What is the minimum slope toward the drain of a shower pan? 1/4" per foot (2%) What is the diameter of #3 rebar? 3/8" If a vendor fails to provide an MSDS, you have the right to call: Cal/OSHA or DOSH
The most frequent on-the-job roofing accidents are: 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. Wood tile Lightweight concrete is best used for: A. Curb and Gutter B. Second floor decking C. First floor slab on grade D. Footings 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 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 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 A separation wall between a dwelling and an attachment.
A stile is the vertical edges of the window and the rails are the bottom and top. What does a high slump test indicate? Too much water. Metal concrete forms should be? A. Oiled B. Watered C. Placed against gravel D. Discarded after each use Oiled What does the R mean in a description of insulation? Resistance What kind of door would you install for someone with a 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 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 contractor when: 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? Two What is the minimum underlayment for asphalt shingles? 15 pounds How long should you wait before sealing new tile work? 2 weeks
When should you float a concrete surface? As soon as the water sheen evaporates When installing drywall screws you should: A. Countersink B. Drive just below the face of the board C. Leave slightly above the surface D. Use the highest torque setting Drive just below the face of the board without breaking the paper. Before placing tile with mastic, you should: Seal the surface. At an excavation, an Underground Service Alert (U.S.A) marking on the dirt that uses red paint or chalk means: Electric power How many diameters is the minimum lap (overlap) between sections of rebar in reinforced masonry? A. 7
B. 12
C. 24
D. 30
30 diameters What is the minimum length of a handrail extension that is required for a stairway? 12" When may a contractor work alone on a roof at a construction site? Never A Freon recovery system is required when: A. Replacing a burnt out rotor in a hermetic unit B. Overhauling a rooftop A/C unit C. Scrapping an old refrigeration unit D. All of the above All of the above Which of the following would you use to install roofing tiles?
From the following list, the best choice of woods for exterior carpentry are: A. Redwood and bald cypress B. Spruce and fir C. Pine and sugar maple D. Fir and hemlock Redwood and bald cypress If a contractor discovers damaged utilities when starting a job, he should: Call the utility department involved. Type-C soils have a compression strength of no more than 0.5 tsp. Which of the following would not be classified as a Type-C soil? A. Rounded gravel B. Crushed rock C. Sand or loamy sand D. Water-logged soil or submerged unstable rock Crushed rock What is the correct exposure for typical hip tiles? 6" Hip and ridge tiles are always installed with a 6" exposure.
Which type of window requires tempered glass? A. Skylight B. Sliding Glass Door C. Exposed top edge is less than 36" from the floor D. Exposed bottom edge is more than 18" from the floor Sliding glass door. The correct sequence for installing vapor barrier is: A. Siding-shear panel-paper B. Shear panel-paper-siding C. Paper-siding-shear panel D. Shear panel-siding-paper Shear panel-paper-siding What is the slope in degrees of a roof with a rise of 12 and a run of 12? A. 22.5 degrees B. 45.0 degrees C. 50.0 degrees
You want to conserve water The best way to handle an I-beam is with a: Nylon strap To determine if a wall is plumb, us a: Level and straight edge The minimum required thickness for tempered glass used in residential shower doors is: 1/8 is the minimum required thickness How many board feet are in a 5"D x 6"W x 20'L beam? 50 board feet. Thickness X Width X Length in Inches dived by 144. When nailing roofing, the railheads: A. Should be brought almost to the surface of the shingle B. Should not exert any pressure on the roofing
C. Should never be overdriven D. All of the above All of the above Soldering of a copper pipe fitting is completed when: Solder appears all around the joint. What is the maximum spacing of single nails in a single layer of drywall on the ceiling? 7" is the maximum spacing of single nails in a single layer of a drywall ceiling. In construction, a hazardous area should be marked with what color tape? Yellow tape should be used to mark off a hazardous area. Green board would be used for? Bathroom walls or possible wet locations. The minimum size vent for a water closet is: 1 1/2" minimum vent size for a water closet.
A. Bedroom ceiling B. Furnace space and attic C. Stairway D. Exterior door Exterior door How many days should you wait between the brown coat and the finish coat when plastering? 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? 2 days How do you decide which metal bracket to use? Per specification in the construction documents. How would you best determine if a soil is expansive? Have the soil tested Where would be the best place to look for a roof leak?
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? Help remove accumulated water in the vent. What is a register used for? A register is used to supply air. The safety valve on a portable air compressor should be popped at least: 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 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?
