CALIFORNIA CUSTODIAN CERTIFICATION EXAMINATION
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1
Before preparing a disinfectant solution for use in a school restroom, what should a custodian
do first to ensure the chemical is used safely and effectively according to regulations?
A. Mix the disinfectant with another cleaner to increase strength
B. Read the manufacturer's label and Safety Data Sheet before use
C. Fill the bucket with hot water regardless of label instructions
D. Apply the disinfectant directly without dilution
Answer: B
Rationale: Reading the manufacturer's label and the Safety Data Sheet (SDS) provides essential
information regarding dilution ratios, hazards, required PPE, storage, and first-aid procedures.
Mixing chemicals or ignoring instructions can create dangerous conditions.
Question 2
When cleaning a classroom that has visible dust on desks, shelves, and electronic equipment,
which cleaning sequence produces the most efficient and effective results?
A. Vacuum first and dust afterward
B. Clean floors before wiping furniture
C. Dust higher surfaces first before cleaning lower surfaces
D. Mop the floor before removing dust
,Answer: C
Rationale: Dust naturally falls downward during cleaning. Cleaning higher surfaces first
prevents having to clean lower surfaces twice.
Question 3
A custodian discovers a puddle of water in a busy hallway during school hours. What should be
the immediate priority before beginning cleanup activities?
A. Wait until students leave the hallway
B. Place wet floor warning signs around the hazard
C. Mop quickly without warning signs
D. Call maintenance before doing anything
Answer: B
Rationale: Preventing slips and falls is the first priority. Warning signs should always be placed
before cleaning begins.
Question 4
Why should custodians avoid mixing bleach with ammonia-based cleaning products even when
attempting to improve cleaning effectiveness?
A. The mixture becomes less expensive
B. It creates highly toxic gases that can seriously injure people
C. It changes the colour of bleach
D. It makes floors slippery
Answer: B
,Rationale: Bleach mixed with ammonia releases toxic chloramine gases that may cause severe
respiratory injuries and other health emergencies.
Question 5
When emptying waste containers throughout a public building, which practice best reduces
exposure to germs while maintaining professional sanitation standards?
A. Compress trash bags using hands
B. Wear appropriate gloves and wash hands afterward
C. Leave overflowing containers until the next shift
D. Reuse damaged trash bags
Answer: B
Rationale: Gloves provide protection against contaminants, while proper handwashing removes
microorganisms after waste handling.
Question 6
Which personal protective equipment provides the most appropriate protection when using a
chemical that may splash into the eyes during cleaning?
A. Baseball cap
B. Safety goggles
C. Cotton gloves only
D. Ear plugs
Answer: B
Rationale: Safety goggles protect the eyes from chemical splashes and are required whenever
splash hazards exist.
, Question 7
A Safety Data Sheet primarily provides employees with information regarding which important
aspect of workplace chemical safety?
A. Employee payroll procedures
B. Chemical hazards, handling, storage, and emergency response
C. Building inspection schedules
D. Vacation benefits
Answer: B
Rationale: SDS documents explain hazards, PPE requirements, safe handling, first aid, and spill
response.
Question 8
When mopping a large hallway in a school during operating hours, why should a custodian work
toward the exit instead of toward a corner?
A. It requires less water
B. It prevents walking across wet floors
C. It makes floors shinier
D. It uses less disinfectant
Answer: B
Rationale: Working toward the exit prevents stepping on freshly cleaned wet surfaces, reducing
slips and preserving cleaning quality.
Question 9
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1
Before preparing a disinfectant solution for use in a school restroom, what should a custodian
do first to ensure the chemical is used safely and effectively according to regulations?
A. Mix the disinfectant with another cleaner to increase strength
B. Read the manufacturer's label and Safety Data Sheet before use
C. Fill the bucket with hot water regardless of label instructions
D. Apply the disinfectant directly without dilution
Answer: B
Rationale: Reading the manufacturer's label and the Safety Data Sheet (SDS) provides essential
information regarding dilution ratios, hazards, required PPE, storage, and first-aid procedures.
Mixing chemicals or ignoring instructions can create dangerous conditions.
Question 2
When cleaning a classroom that has visible dust on desks, shelves, and electronic equipment,
which cleaning sequence produces the most efficient and effective results?
A. Vacuum first and dust afterward
B. Clean floors before wiping furniture
C. Dust higher surfaces first before cleaning lower surfaces
D. Mop the floor before removing dust
,Answer: C
Rationale: Dust naturally falls downward during cleaning. Cleaning higher surfaces first
prevents having to clean lower surfaces twice.
Question 3
A custodian discovers a puddle of water in a busy hallway during school hours. What should be
the immediate priority before beginning cleanup activities?
A. Wait until students leave the hallway
B. Place wet floor warning signs around the hazard
C. Mop quickly without warning signs
D. Call maintenance before doing anything
Answer: B
Rationale: Preventing slips and falls is the first priority. Warning signs should always be placed
before cleaning begins.
Question 4
Why should custodians avoid mixing bleach with ammonia-based cleaning products even when
attempting to improve cleaning effectiveness?
A. The mixture becomes less expensive
B. It creates highly toxic gases that can seriously injure people
C. It changes the colour of bleach
D. It makes floors slippery
Answer: B
,Rationale: Bleach mixed with ammonia releases toxic chloramine gases that may cause severe
respiratory injuries and other health emergencies.
Question 5
When emptying waste containers throughout a public building, which practice best reduces
exposure to germs while maintaining professional sanitation standards?
A. Compress trash bags using hands
B. Wear appropriate gloves and wash hands afterward
C. Leave overflowing containers until the next shift
D. Reuse damaged trash bags
Answer: B
Rationale: Gloves provide protection against contaminants, while proper handwashing removes
microorganisms after waste handling.
Question 6
Which personal protective equipment provides the most appropriate protection when using a
chemical that may splash into the eyes during cleaning?
A. Baseball cap
B. Safety goggles
C. Cotton gloves only
D. Ear plugs
Answer: B
Rationale: Safety goggles protect the eyes from chemical splashes and are required whenever
splash hazards exist.
, Question 7
A Safety Data Sheet primarily provides employees with information regarding which important
aspect of workplace chemical safety?
A. Employee payroll procedures
B. Chemical hazards, handling, storage, and emergency response
C. Building inspection schedules
D. Vacation benefits
Answer: B
Rationale: SDS documents explain hazards, PPE requirements, safe handling, first aid, and spill
response.
Question 8
When mopping a large hallway in a school during operating hours, why should a custodian work
toward the exit instead of toward a corner?
A. It requires less water
B. It prevents walking across wet floors
C. It makes floors shinier
D. It uses less disinfectant
Answer: B
Rationale: Working toward the exit prevents stepping on freshly cleaned wet surfaces, reducing
slips and preserving cleaning quality.
Question 9
