CALIFORNIA CUSTODIAN CERTIFICATION EXAM
MASTER PREP VERIFIED Q&AS WITH
RATIONALES
This comprehensive master practice bank is meticulously
engineered to guarantee a passing score on the California
Custodian Certification Exam. It features premium, verified
multiple-choice questions complete with italicized correct
answers and high-utility, bolded rationales covering critical
Cal/OSHA regulations and hazard protocols. This study guide is
the ultimate high-conversion asset for facility maintenance
professionals looking to ace their civil service and school district
sanitation exams.
Part 1: Chemical Safety & Hazard Communication
(HazCom)
1. What does the acronym SDS stand for under
Cal/OSHA regulations?
A) Safe Dust System
B) Safety Data Sheet
C) Standard Dilution Solvent
D) Structural Damage Solutions
Answer: B) Safety Data Sheet
Rationale: The Safety Data Sheet (SDS) is a
legally required document that provides
comprehensive safety, handling, and
, environmental information about chemical
products.
2. When diluting concentrated commercial
cleaning chemicals, which protocol must
always be followed?
A) Pour the chemical first, then add water
quickly.
B) Pour the chemical and water simultaneously
into a bucket.
C) Fill the container with the required water
first, then add the chemical.
D) Mix the chemicals with hot water to speed up
activation.
Answer: C) Fill the container with the required
water first, then add the chemical.
Rationale: Adding chemical to water ("Always
Add Acid/Chemical to water") prevents toxic or
corrosive liquids from splashing upward out of
the container onto the operator if a water
stream hits it forcefully.
3. Mixing household bleach with products
containing ammonia creates which deadly
substance?
A) Hydrogen gas
, B) Carbon monoxide
C) Chloramine gas
D) Hydrochloric acid
Answer: C) Chloramine gas
Rationale: Mixing bleach and ammonia causes a
severe chemical reaction that releases toxic
chloramine gases, which can cause acute
respiratory distress, lung damage, or death.
4. Under the Global Harmonized System (GHS), a
pictogram displaying a flame over a circle
indicates what specific hazard?
A) Flammable material
B) Explosive hazard
C) Oxidizing agent
D) Corrosive chemical
Answer: C) Oxidizing agent
Rationale: A flame over a circle indicates an
oxidizer, meaning the chemical can provide
oxygen to stimulate, intensify, or sustain a fire
in surrounding materials.
5. What color is traditionally used on a secondary
container label to indicate a health hazard?
A) Red
B) Yellow
, C) Blue
D) Green
Answer: C) Blue
Rationale: Under standard hazardous material
labeling systems, blue represents health
hazards, red represents flammability, yellow
represents instability/reactivity, and white
indicates special precautions.
6. If a custodian gets a corrosive floor stripper
splashed into their eyes, how long should they
flush their eyes at an emergency eyewash
station?
A) At least 5 minutes
B) At least 10 minutes
C) At least 15 to 20 minutes
D) Only until the burning sensation stops
Answer: C) At least 15 to 20 minutes
Rationale: Cal/OSHA guidelines mandate
flushing the eyes for a minimum of 15 to 20
minutes with clean water following exposure to
corrosive chemicals to fully neutralize the
substance.
7. What is the main purpose of a "Signal Word" on
a chemical label?
MASTER PREP VERIFIED Q&AS WITH
RATIONALES
This comprehensive master practice bank is meticulously
engineered to guarantee a passing score on the California
Custodian Certification Exam. It features premium, verified
multiple-choice questions complete with italicized correct
answers and high-utility, bolded rationales covering critical
Cal/OSHA regulations and hazard protocols. This study guide is
the ultimate high-conversion asset for facility maintenance
professionals looking to ace their civil service and school district
sanitation exams.
Part 1: Chemical Safety & Hazard Communication
(HazCom)
1. What does the acronym SDS stand for under
Cal/OSHA regulations?
A) Safe Dust System
B) Safety Data Sheet
C) Standard Dilution Solvent
D) Structural Damage Solutions
Answer: B) Safety Data Sheet
Rationale: The Safety Data Sheet (SDS) is a
legally required document that provides
comprehensive safety, handling, and
, environmental information about chemical
products.
2. When diluting concentrated commercial
cleaning chemicals, which protocol must
always be followed?
A) Pour the chemical first, then add water
quickly.
B) Pour the chemical and water simultaneously
into a bucket.
C) Fill the container with the required water
first, then add the chemical.
D) Mix the chemicals with hot water to speed up
activation.
Answer: C) Fill the container with the required
water first, then add the chemical.
Rationale: Adding chemical to water ("Always
Add Acid/Chemical to water") prevents toxic or
corrosive liquids from splashing upward out of
the container onto the operator if a water
stream hits it forcefully.
3. Mixing household bleach with products
containing ammonia creates which deadly
substance?
A) Hydrogen gas
, B) Carbon monoxide
C) Chloramine gas
D) Hydrochloric acid
Answer: C) Chloramine gas
Rationale: Mixing bleach and ammonia causes a
severe chemical reaction that releases toxic
chloramine gases, which can cause acute
respiratory distress, lung damage, or death.
4. Under the Global Harmonized System (GHS), a
pictogram displaying a flame over a circle
indicates what specific hazard?
A) Flammable material
B) Explosive hazard
C) Oxidizing agent
D) Corrosive chemical
Answer: C) Oxidizing agent
Rationale: A flame over a circle indicates an
oxidizer, meaning the chemical can provide
oxygen to stimulate, intensify, or sustain a fire
in surrounding materials.
5. What color is traditionally used on a secondary
container label to indicate a health hazard?
A) Red
B) Yellow
, C) Blue
D) Green
Answer: C) Blue
Rationale: Under standard hazardous material
labeling systems, blue represents health
hazards, red represents flammability, yellow
represents instability/reactivity, and white
indicates special precautions.
6. If a custodian gets a corrosive floor stripper
splashed into their eyes, how long should they
flush their eyes at an emergency eyewash
station?
A) At least 5 minutes
B) At least 10 minutes
C) At least 15 to 20 minutes
D) Only until the burning sensation stops
Answer: C) At least 15 to 20 minutes
Rationale: Cal/OSHA guidelines mandate
flushing the eyes for a minimum of 15 to 20
minutes with clean water following exposure to
corrosive chemicals to fully neutralize the
substance.
7. What is the main purpose of a "Signal Word" on
a chemical label?
