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