CSLB B License General Contractor Exam
Questions and Answers 2025/2026| 100%
Correct Verified Answers
1. If unused mortar stiffens due to hydration of cement, what must you do? - ANSWERS-
Discard the mortar
2. What minimum time must you wait before caulking or grouting new tiles? - ANSWERS-
24-48 Hours
3. How long should you wait before installing tile on a shower pan? - ANSWERS-24 Hours
4. 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: -
ANSWERS-Type-B Soils
5. If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each
light? - ANSWERS-35V
6. In a series circuit, the total voltage is divided equally.
7. For safety reasons, the maximum simple slope of an excavation, up to 20 ft deep, in
Type-B soil is: - ANSWERS-1:1 (45°)
8. A Pittsburgh joint is used in: - ANSWERS-HVAC ductwork
,9. The drain for a pressure relief valve on a water heater should be extended to: -
ANSWERS-The outside of the building
10. What is the minimum slope toward the drain of a shower pan? - ANSWERS-1/4" per foot
(2%)
11. What is the diameter of #3 rebar? - ANSWERS-3/8"
12. If a vendor fails to provide an MSDS, you have the right to call: - ANSWERS-Cal/OSHA or
DOSH
13. When installing a door jamb, you need shims at: - ANSWERS-Both hinge and strike sides,
three on each side.
14. Which of the following is used to adhere vinyl floors?
A. Epoxy cement
B. Asphalt mastic
C. Latex primer
D. White glue - ANSWERS-Epoxy cement
15. When do you need bracing for a drywall wall? - ANSWERS-Diagonal bracing is needed
every 25' for any drywall wall.
16. How should you clear the roots from a construction site? - ANSWERS-Clear roots to 12"
below grade.
17. Dividing watts by amps gives you: - ANSWERS-Volts
,18. The most frequent on-the-job roofing accidents are: - ANSWERS-Falls
19. 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. - ANSWERS-Wood tile
20. Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings - ANSWERS-Second floor decking
21. 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 - ANSWERS-Spot Board
22. Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
C. Extra strength vitrified clay
D. Copper - ANSWERS-Copper
, 23. 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 - ANSWERS-A
separation wall between a dwelling and an attachment.
24. What is the minimum clearance between rough ground and untreated subfloor joists? -
ANSWERS-18 inches
25. Who may remove asbestos? - ANSWERS-Contractor with Asbestos Certification on
license.
26. Which of the following is NOT likely to be found in significant proportions in granular
soil?
A. Gravel
B. Sand
C. Silt
D. Clay - ANSWERS-Clay
27. Stiles and rails are used on which of the following?
A. Furred walls
B. Roofs
C. Windows
D. Slabs - ANSWERS-Windows.
28. A stile is the vertical edges of the window and the rails are the bottom and top.
Questions and Answers 2025/2026| 100%
Correct Verified Answers
1. If unused mortar stiffens due to hydration of cement, what must you do? - ANSWERS-
Discard the mortar
2. What minimum time must you wait before caulking or grouting new tiles? - ANSWERS-
24-48 Hours
3. How long should you wait before installing tile on a shower pan? - ANSWERS-24 Hours
4. 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: -
ANSWERS-Type-B Soils
5. If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each
light? - ANSWERS-35V
6. In a series circuit, the total voltage is divided equally.
7. For safety reasons, the maximum simple slope of an excavation, up to 20 ft deep, in
Type-B soil is: - ANSWERS-1:1 (45°)
8. A Pittsburgh joint is used in: - ANSWERS-HVAC ductwork
,9. The drain for a pressure relief valve on a water heater should be extended to: -
ANSWERS-The outside of the building
10. What is the minimum slope toward the drain of a shower pan? - ANSWERS-1/4" per foot
(2%)
11. What is the diameter of #3 rebar? - ANSWERS-3/8"
12. If a vendor fails to provide an MSDS, you have the right to call: - ANSWERS-Cal/OSHA or
DOSH
13. When installing a door jamb, you need shims at: - ANSWERS-Both hinge and strike sides,
three on each side.
14. Which of the following is used to adhere vinyl floors?
A. Epoxy cement
B. Asphalt mastic
C. Latex primer
D. White glue - ANSWERS-Epoxy cement
15. When do you need bracing for a drywall wall? - ANSWERS-Diagonal bracing is needed
every 25' for any drywall wall.
16. How should you clear the roots from a construction site? - ANSWERS-Clear roots to 12"
below grade.
17. Dividing watts by amps gives you: - ANSWERS-Volts
,18. The most frequent on-the-job roofing accidents are: - ANSWERS-Falls
19. 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. - ANSWERS-Wood tile
20. Lightweight concrete is best used for:
A. Curb and Gutter
B. Second floor decking
C. First floor slab on grade
D. Footings - ANSWERS-Second floor decking
21. 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 - ANSWERS-Spot Board
22. Which pipe is NOT appropriate for industrial wastes?
A. Cast iron
B. Schedule 40 ABS DWV
C. Extra strength vitrified clay
D. Copper - ANSWERS-Copper
, 23. 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 - ANSWERS-A
separation wall between a dwelling and an attachment.
24. What is the minimum clearance between rough ground and untreated subfloor joists? -
ANSWERS-18 inches
25. Who may remove asbestos? - ANSWERS-Contractor with Asbestos Certification on
license.
26. Which of the following is NOT likely to be found in significant proportions in granular
soil?
A. Gravel
B. Sand
C. Silt
D. Clay - ANSWERS-Clay
27. Stiles and rails are used on which of the following?
A. Furred walls
B. Roofs
C. Windows
D. Slabs - ANSWERS-Windows.
28. A stile is the vertical edges of the window and the rails are the bottom and top.
