California Custodian Certification Exam
Test Questions And Correct Answers
(Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download Pdf,
Question 1
A custodian notices a wet floor near a drinking fountain but no
caution sign is present. What is the FIRST required action?
A. Mop the area immediately
B. Place a wet floor warning sign and then dry the area
C. Report the hazard to a supervisor before acting
D. Ignore it if no one is nearby
Correct ,,,answer,,,,: B. Place a wet floor warning sign and then dry
the area
Rationale: California workplace safety standards (Cal/OSHA)
require immediate warning of slip hazards. Placing a sign first
protects others while the custodian addresses the spill .
Question 2
Which document must an employer maintain for each hazardous
chemical used in a California school custodial closet?
A. Material Safety Data Sheet (old format)
B. Safety Data Sheet (SDS)
,C. Chemical Inventory Log only
D. Product warranty certificate
Correct ,,,answer,,,,: B. Safety Data Sheet (SDS)
Rationale: OSHA's Hazard Communication Standard requires Safety
Data Sheets for all hazardous chemicals. The SDS provides
comprehensive information about chemical hazards, handling
instructions, and specific PPE requirements for safe cleanup .
Question 3
What is the most effective method for preventing cross-
contamination when cleaning multiple rooms?
A. Using the same microfiber cloth for all surfaces to save time
B. Implementing a color-coded tool and cloth system
C. Rinsing the mop in the same water for the entire floor
D. Using high-pressure sprayers on all touchpoints
Correct ,,,answer,,,,: B. Implementing a color-coded tool and cloth
system
Rationale: A color-coded system ensures that tools used in high-risk
areas, like restrooms, are not used in low-risk areas, like offices,
thereby minimizing the spread of pathogens .
Question 4
When handling a chemical spill, what is the first document a
,custodian should consult to identify specific hazards and PPE
requirements?
A. The facility's employee handbook
B. The Safety Data Sheet (SDS)
C. The original purchase invoice
D. The building's floor plan
Correct ,,,answer,,,,: B. The Safety Data Sheet (SDS)
Rationale: The SDS provides comprehensive information about
chemical hazards, handling instructions, and the specific personal
protective equipment required for safe cleanup .
Question 5
A custodian finds a used hypodermic needle in a trash can. What is
the correct procedure?
A. Pick it up with gloved hands and place in trash
B. Use a puncture-resistant sharps container and a mechanical
device
C. Flatten it with a broom before disposal
D. Leave it and notify a nurse only
Correct ,,,answer,,,,: B. Use a puncture-resistant sharps container
and a mechanical device
Rationale: The Bloodborne Pathogens Standard requires mechanical
pickup (tongs/scoop) and disposal in a puncture-resistant sharps
container. Never use hands to handle sharps .
, Question 6
What is the minimum recommended dwell time for a quaternary
ammonium disinfectant on a non-porous surface?
A. 10 seconds
B. 30 seconds
C. 1 minute
D. 10 minutes
Correct ,,,answer,,,,: C. 1 minute
Rationale: Most quat-based disinfectants require a wet contact time
of 1–10 minutes. The minimum common standard is 1 minute;
always follow label instructions .
Question 7
A custodian is mopping a classroom floor. Which pattern minimizes
recontamination and is safest?
A. Figure-eight pattern starting from the door
B. Random overlapping strokes
C. "S" pattern working from the farthest corner toward the exit
D. Circular pattern ending in the center
Correct ,,,answer,,,,: C. "S" pattern working from the farthest corner
toward the exit
Rationale: Working from the farthest corner to the exit prevents
walking over cleaned areas, reducing recontamination and slip risk .
Test Questions And Correct Answers
(Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download Pdf,
Question 1
A custodian notices a wet floor near a drinking fountain but no
caution sign is present. What is the FIRST required action?
A. Mop the area immediately
B. Place a wet floor warning sign and then dry the area
C. Report the hazard to a supervisor before acting
D. Ignore it if no one is nearby
Correct ,,,answer,,,,: B. Place a wet floor warning sign and then dry
the area
Rationale: California workplace safety standards (Cal/OSHA)
require immediate warning of slip hazards. Placing a sign first
protects others while the custodian addresses the spill .
Question 2
Which document must an employer maintain for each hazardous
chemical used in a California school custodial closet?
A. Material Safety Data Sheet (old format)
B. Safety Data Sheet (SDS)
,C. Chemical Inventory Log only
D. Product warranty certificate
Correct ,,,answer,,,,: B. Safety Data Sheet (SDS)
Rationale: OSHA's Hazard Communication Standard requires Safety
Data Sheets for all hazardous chemicals. The SDS provides
comprehensive information about chemical hazards, handling
instructions, and specific PPE requirements for safe cleanup .
Question 3
What is the most effective method for preventing cross-
contamination when cleaning multiple rooms?
A. Using the same microfiber cloth for all surfaces to save time
B. Implementing a color-coded tool and cloth system
C. Rinsing the mop in the same water for the entire floor
D. Using high-pressure sprayers on all touchpoints
Correct ,,,answer,,,,: B. Implementing a color-coded tool and cloth
system
Rationale: A color-coded system ensures that tools used in high-risk
areas, like restrooms, are not used in low-risk areas, like offices,
thereby minimizing the spread of pathogens .
Question 4
When handling a chemical spill, what is the first document a
,custodian should consult to identify specific hazards and PPE
requirements?
A. The facility's employee handbook
B. The Safety Data Sheet (SDS)
C. The original purchase invoice
D. The building's floor plan
Correct ,,,answer,,,,: B. The Safety Data Sheet (SDS)
Rationale: The SDS provides comprehensive information about
chemical hazards, handling instructions, and the specific personal
protective equipment required for safe cleanup .
Question 5
A custodian finds a used hypodermic needle in a trash can. What is
the correct procedure?
A. Pick it up with gloved hands and place in trash
B. Use a puncture-resistant sharps container and a mechanical
device
C. Flatten it with a broom before disposal
D. Leave it and notify a nurse only
Correct ,,,answer,,,,: B. Use a puncture-resistant sharps container
and a mechanical device
Rationale: The Bloodborne Pathogens Standard requires mechanical
pickup (tongs/scoop) and disposal in a puncture-resistant sharps
container. Never use hands to handle sharps .
, Question 6
What is the minimum recommended dwell time for a quaternary
ammonium disinfectant on a non-porous surface?
A. 10 seconds
B. 30 seconds
C. 1 minute
D. 10 minutes
Correct ,,,answer,,,,: C. 1 minute
Rationale: Most quat-based disinfectants require a wet contact time
of 1–10 minutes. The minimum common standard is 1 minute;
always follow label instructions .
Question 7
A custodian is mopping a classroom floor. Which pattern minimizes
recontamination and is safest?
A. Figure-eight pattern starting from the door
B. Random overlapping strokes
C. "S" pattern working from the farthest corner toward the exit
D. Circular pattern ending in the center
Correct ,,,answer,,,,: C. "S" pattern working from the farthest corner
toward the exit
Rationale: Working from the farthest corner to the exit prevents
walking over cleaned areas, reducing recontamination and slip risk .
