CSLB B LICENSE GENERAL
CONTRACTOR EXAM / STUDY GUIDE
ACTUAL QUESTIONS AND ANSWERS (A+
GUIDE SOLUTION) NEWEST 2026/2027
1. If unused mortar stiffens due to hydration of cement,
what must you do?
Correct Answer: Discard the mortar
2. What minimum time must you wait before caulking
or grouting new tiles?
Correct Answer: 24–48 Hours
3. How long should you wait before installing tile on a
shower pan?
Correct Answer: 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 Answer: Type-B Soils
,5. If 65 street lights are fed by a 2275 volt series circuit,
what is the voltage across each light?
Correct Answer: 35V
6. In a series circuit, the total voltage is divided equally.
Correct Answer: 35V
7. For safety reasons, the maximum simple slope of an
excavation, up to 20 ft deep, in Type-B soil is:
Correct Answer: 1:1 (45º)
8. A Pittsburgh joint is used in:
Correct Answer: HVAC ductwork
9. The drain for a pressure relief valve on a water heater
should be extended to:
Correct Answer: The outside of the building
10. What is the minimum slope toward the drain of a
shower pan?
Correct Answer: 1/4" per foot (2%)
11. What is the diameter of #3 rebar?
Correct Answer: 3/8"
12. If a vendor fails to provide an MSDS, you have
the right to call:
Correct Answer: Cal/OSHA or DOSH
13. When installing a door jamb, you need shims at:
Correct Answer: 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
Correct Answer: Epoxy cement
15. When do you need bracing for a drywall wall?
Correct Answer: Diagonal bracing is needed every 25’
for any drywall wall.
16. How should you clear the roots from a
construction site?
Correct Answer: Clear roots to 12" below grade.
17. Dividing watts by amps gives you:
Correct Answer: Volts
18. The most frequent on-the-job roofing accidents
are:
Correct Answer: 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.
Correct Answer: 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
Correct Answer: 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
Correct Answer: 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
Correct Answer: Copper
23. Where do you need a fire wall?
A. Between a living room and a bedroom
CONTRACTOR EXAM / STUDY GUIDE
ACTUAL QUESTIONS AND ANSWERS (A+
GUIDE SOLUTION) NEWEST 2026/2027
1. If unused mortar stiffens due to hydration of cement,
what must you do?
Correct Answer: Discard the mortar
2. What minimum time must you wait before caulking
or grouting new tiles?
Correct Answer: 24–48 Hours
3. How long should you wait before installing tile on a
shower pan?
Correct Answer: 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 Answer: Type-B Soils
,5. If 65 street lights are fed by a 2275 volt series circuit,
what is the voltage across each light?
Correct Answer: 35V
6. In a series circuit, the total voltage is divided equally.
Correct Answer: 35V
7. For safety reasons, the maximum simple slope of an
excavation, up to 20 ft deep, in Type-B soil is:
Correct Answer: 1:1 (45º)
8. A Pittsburgh joint is used in:
Correct Answer: HVAC ductwork
9. The drain for a pressure relief valve on a water heater
should be extended to:
Correct Answer: The outside of the building
10. What is the minimum slope toward the drain of a
shower pan?
Correct Answer: 1/4" per foot (2%)
11. What is the diameter of #3 rebar?
Correct Answer: 3/8"
12. If a vendor fails to provide an MSDS, you have
the right to call:
Correct Answer: Cal/OSHA or DOSH
13. When installing a door jamb, you need shims at:
Correct Answer: 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
Correct Answer: Epoxy cement
15. When do you need bracing for a drywall wall?
Correct Answer: Diagonal bracing is needed every 25’
for any drywall wall.
16. How should you clear the roots from a
construction site?
Correct Answer: Clear roots to 12" below grade.
17. Dividing watts by amps gives you:
Correct Answer: Volts
18. The most frequent on-the-job roofing accidents
are:
Correct Answer: 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.
Correct Answer: 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
Correct Answer: 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
Correct Answer: 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
Correct Answer: Copper
23. Where do you need a fire wall?
A. Between a living room and a bedroom
