THE ULTIMATE CUSTODIAN CERTIFICATION
EXAM PREP GUIDE:
300 PRACTICE QUESTIONS WITH DETAILED
ANSWERS & RATIONALES GUARANTEED
PASS /MOST RECENT | A+ GRADED
ALREADY
QUESTIONS 1–10: SAFETY & CHEMICAL HANDLING
QUESTION 1
A custodian encounters an unknown chemical powder spilled on the floor. What is
the most appropriate initial response?
A) Vacuum the powder immediately.
B) Put on PPE and begin cleanup.
C) Evacuate the area and call for hazardous materials response.
D) Neutralize the powder with a common household chemical.
Answer: C
Rationale: Without knowing the substance, attempting cleanup or neutralization is
dangerous. The first step is to ensure safety by evacuating the area and alerting
trained professionals.
QUESTION 2
What does "pH" measure in boiler water, and why is it important?
A) The temperature of the water.
B) The acidity or alkalinity of the water.
C) The pressure of the water.
D) The amount of hardness (calcium) in the water.
,Answer: B
Rationale: Boiler water should be slightly alkaline (pH 10–11) to prevent corrosion. A
low pH (acidic) will eat away at the metal components of the boiler.
QUESTION 3
Which section of a Safety Data Sheet (SDS) provides specific first aid measures for a
chemical exposure?
A) Section 4: First-Aid Measures
B) Section 5: Fire-Fighting Measures
C) Section 8: Exposure Controls/Personal Protection
D) Section 11: Toxicological Information
Answer: A
Rationale: Section 4 is dedicated to first aid measures, including symptoms of
exposure and immediate treatment steps.
QUESTION 4
How should a custodian dispose of a used needle (sharp) found in a restroom trash
can?
A) Pick it up with gloved hands and place it in a regular trash bag.
B) Use tongs or a dustpan to place it in a puncture-resistant sharps container.
C) Leave it and notify the supervisor, but do not touch it.
D) Place it in a red biohazard bag after wrapping it in paper towels.
Answer: B
Rationale: OSHA requires that contaminated sharps be disposed of in a puncture-
resistant, leak-proof container. Using tongs or a dustpan avoids direct hand contact.
QUESTION 5
What is the minimum Personal Protective Equipment (PPE) required when mixing
concentrated cleaning chemicals?
A) Safety glasses only
B) Gloves and safety goggles
,C) Gloves, goggles, and apron
D) Full-face respirator
Answer: C
Rationale: When mixing concentrates, splashes are likely. Gloves protect hands,
goggles protect eyes, and an apron protects clothing and skin from chemical burns.
QUESTION 6
What does the acronym "PASS" stand for when using a fire extinguisher?
A) Pull, Aim, Squeeze, Sweep
B) Push, Activate, Spray, Stop
C) Prepare, Assess, Suppress, Secure
D) Point, Approach, Squeeze, Shoot
Answer: A
Rationale: PASS is the standard fire extinguisher operation sequence: Pull the pin,
Aim at the base of the fire, Squeeze the handle, and Sweep side to side.
QUESTION 7
What should a custodian do if they smell gas in a boiler room?
A) Open a window and continue working.
B) Ignite a match to check for the leak.
C) Evacuate the area, do not operate electrical switches, and call the gas company or
supervisor.
D) Turn on exhaust fans immediately.
Answer: C
Rationale: Gas leaks are explosive hazards. Electrical switches can create sparks.
Evacuation and calling professionals from a safe distance is the correct protocol.
QUESTION 8
When lifting a heavy trash bag, what body mechanics should a custodian use?
, A) Bend at the waist and lift with the back.
B) Keep feet together and twist while lifting.
C) Bend at the knees, keep the back straight, and lift with the legs.
D) Use one hand and swing the bag onto the shoulder.
Answer: C
Rationale: Proper lifting technique uses the strong leg muscles, not the back, to
prevent injury. Keeping the back straight reduces strain on spinal discs.
QUESTION 9
What is the purpose of a "lockout/tagout" (LOTO) procedure?
A) To secure cleaning supplies in a locked closet.
B) To prevent accidental startup of machinery during maintenance or repair.
C) To lock the building doors at the end of the day.
D) To tag equipment for disposal.
Answer: B
Rationale: Lockout/tagout is a safety procedure that ensures dangerous machines
are properly shut off and cannot be started up again before maintenance is
completed.
QUESTION 10
What is the appropriate response to a small chemical spill on the floor?
A) Ignore it if it is a small amount.
B) Mop it up with a wet mop and dump the water down the drain.
C) Use a spill kit, contain the spill, and follow SDS guidelines for cleanup.
D) Sprinkle water on it to dilute it.
Answer: C
Rationale: Spill kits contain absorbents and neutralizers. Following the SDS ensures
safe and compliant cleanup. Never dilute without knowing the chemical.
QUESTIONS 11–20: CLEANING & DISINFECTION PROCEDURES
EXAM PREP GUIDE:
300 PRACTICE QUESTIONS WITH DETAILED
ANSWERS & RATIONALES GUARANTEED
PASS /MOST RECENT | A+ GRADED
ALREADY
QUESTIONS 1–10: SAFETY & CHEMICAL HANDLING
QUESTION 1
A custodian encounters an unknown chemical powder spilled on the floor. What is
the most appropriate initial response?
A) Vacuum the powder immediately.
B) Put on PPE and begin cleanup.
C) Evacuate the area and call for hazardous materials response.
D) Neutralize the powder with a common household chemical.
Answer: C
Rationale: Without knowing the substance, attempting cleanup or neutralization is
dangerous. The first step is to ensure safety by evacuating the area and alerting
trained professionals.
QUESTION 2
What does "pH" measure in boiler water, and why is it important?
A) The temperature of the water.
B) The acidity or alkalinity of the water.
C) The pressure of the water.
D) The amount of hardness (calcium) in the water.
,Answer: B
Rationale: Boiler water should be slightly alkaline (pH 10–11) to prevent corrosion. A
low pH (acidic) will eat away at the metal components of the boiler.
QUESTION 3
Which section of a Safety Data Sheet (SDS) provides specific first aid measures for a
chemical exposure?
A) Section 4: First-Aid Measures
B) Section 5: Fire-Fighting Measures
C) Section 8: Exposure Controls/Personal Protection
D) Section 11: Toxicological Information
Answer: A
Rationale: Section 4 is dedicated to first aid measures, including symptoms of
exposure and immediate treatment steps.
QUESTION 4
How should a custodian dispose of a used needle (sharp) found in a restroom trash
can?
A) Pick it up with gloved hands and place it in a regular trash bag.
B) Use tongs or a dustpan to place it in a puncture-resistant sharps container.
C) Leave it and notify the supervisor, but do not touch it.
D) Place it in a red biohazard bag after wrapping it in paper towels.
Answer: B
Rationale: OSHA requires that contaminated sharps be disposed of in a puncture-
resistant, leak-proof container. Using tongs or a dustpan avoids direct hand contact.
QUESTION 5
What is the minimum Personal Protective Equipment (PPE) required when mixing
concentrated cleaning chemicals?
A) Safety glasses only
B) Gloves and safety goggles
,C) Gloves, goggles, and apron
D) Full-face respirator
Answer: C
Rationale: When mixing concentrates, splashes are likely. Gloves protect hands,
goggles protect eyes, and an apron protects clothing and skin from chemical burns.
QUESTION 6
What does the acronym "PASS" stand for when using a fire extinguisher?
A) Pull, Aim, Squeeze, Sweep
B) Push, Activate, Spray, Stop
C) Prepare, Assess, Suppress, Secure
D) Point, Approach, Squeeze, Shoot
Answer: A
Rationale: PASS is the standard fire extinguisher operation sequence: Pull the pin,
Aim at the base of the fire, Squeeze the handle, and Sweep side to side.
QUESTION 7
What should a custodian do if they smell gas in a boiler room?
A) Open a window and continue working.
B) Ignite a match to check for the leak.
C) Evacuate the area, do not operate electrical switches, and call the gas company or
supervisor.
D) Turn on exhaust fans immediately.
Answer: C
Rationale: Gas leaks are explosive hazards. Electrical switches can create sparks.
Evacuation and calling professionals from a safe distance is the correct protocol.
QUESTION 8
When lifting a heavy trash bag, what body mechanics should a custodian use?
, A) Bend at the waist and lift with the back.
B) Keep feet together and twist while lifting.
C) Bend at the knees, keep the back straight, and lift with the legs.
D) Use one hand and swing the bag onto the shoulder.
Answer: C
Rationale: Proper lifting technique uses the strong leg muscles, not the back, to
prevent injury. Keeping the back straight reduces strain on spinal discs.
QUESTION 9
What is the purpose of a "lockout/tagout" (LOTO) procedure?
A) To secure cleaning supplies in a locked closet.
B) To prevent accidental startup of machinery during maintenance or repair.
C) To lock the building doors at the end of the day.
D) To tag equipment for disposal.
Answer: B
Rationale: Lockout/tagout is a safety procedure that ensures dangerous machines
are properly shut off and cannot be started up again before maintenance is
completed.
QUESTION 10
What is the appropriate response to a small chemical spill on the floor?
A) Ignore it if it is a small amount.
B) Mop it up with a wet mop and dump the water down the drain.
C) Use a spill kit, contain the spill, and follow SDS guidelines for cleanup.
D) Sprinkle water on it to dilute it.
Answer: C
Rationale: Spill kits contain absorbents and neutralizers. Following the SDS ensures
safe and compliant cleanup. Never dilute without knowing the chemical.
QUESTIONS 11–20: CLEANING & DISINFECTION PROCEDURES
