CALIFORNIA CUSTODIAN
PROFESSIONAL PRACTICE EXAM
QUESTIONS AND VERIFIED ANSWERS
WITH. JUST RELEASED
1. What toxic gas is produced when sodium hypochlorite (bleach) is mixed with ammonia-
based cleaners?
A. Carbon monoxide
B. Methane
C. Sulfur dioxide
D. Chloramine gas
Answer: D
Conceptual Explanation: Mixing bleach and ammonia triggers a chemical reaction that
releases chloramine gas, which is highly irritating to the respiratory system and can be
fatal in high concentrations.
2. According to OSHA’s Hazard Communication Standard, which section of the Safety Data
Sheet (SDS) provides information on first-aid measures?
A. Section 4
B. Section 1
,C. Section 8
D. Section 11
Answer: A
Conceptual Explanation: Section 4 of an SDS specifically details first-aid measures
including symptoms/effects and required treatment for exposure.
3. What is the recommended dilution ratio for a chemical labeled as 1:64 in a 5-gallon mop
bucket?
A. 10 ounces
B. 8 ounces
C. 5 ounces
D. 12 ounces
Answer: A
Conceptual Explanation: There are 128 ounces in a gallon. For 5 gallons, there are 640
ounces. 640 divided by 64 equals 10 ounces.
4. In floor maintenance, what is the primary purpose of a ‘neutral cleaner’?
A. To strip wax from the floor
B. To clean floors without damaging the finish or pH balance
C. To etch concrete for better adhesion
, D. To kill all known viruses and bacteria
Answer: B
Conceptual Explanation: Neutral cleaners have a pH of around 7.0 and are designed to
remove soil without reacting with or dulling the floor finish.
5. When stripping a floor, why is it critical to use cold or room-temperature water rather than
hot water?
A. Hot water makes the floor too slippery
B. Hot water can cause the chemical to evaporate too quickly and create dangerous fumes
C. Cold water helps the wax harden for easier removal
D. Hot water damages the electric buffer motor
Answer: B
Conceptual Explanation: Stripping chemicals are highly volatile; hot water increases the
rate of evaporation, leading to toxic inhalation hazards and reducing the chemical’s
effectiveness.
6. What is the specific OSHA requirement for the ‘ladder ratio’ when leaning a straight ladder
against a wall?
A. 2:1 ratio
B. 4:1 ratio
C. 3:1 ratio
PROFESSIONAL PRACTICE EXAM
QUESTIONS AND VERIFIED ANSWERS
WITH. JUST RELEASED
1. What toxic gas is produced when sodium hypochlorite (bleach) is mixed with ammonia-
based cleaners?
A. Carbon monoxide
B. Methane
C. Sulfur dioxide
D. Chloramine gas
Answer: D
Conceptual Explanation: Mixing bleach and ammonia triggers a chemical reaction that
releases chloramine gas, which is highly irritating to the respiratory system and can be
fatal in high concentrations.
2. According to OSHA’s Hazard Communication Standard, which section of the Safety Data
Sheet (SDS) provides information on first-aid measures?
A. Section 4
B. Section 1
,C. Section 8
D. Section 11
Answer: A
Conceptual Explanation: Section 4 of an SDS specifically details first-aid measures
including symptoms/effects and required treatment for exposure.
3. What is the recommended dilution ratio for a chemical labeled as 1:64 in a 5-gallon mop
bucket?
A. 10 ounces
B. 8 ounces
C. 5 ounces
D. 12 ounces
Answer: A
Conceptual Explanation: There are 128 ounces in a gallon. For 5 gallons, there are 640
ounces. 640 divided by 64 equals 10 ounces.
4. In floor maintenance, what is the primary purpose of a ‘neutral cleaner’?
A. To strip wax from the floor
B. To clean floors without damaging the finish or pH balance
C. To etch concrete for better adhesion
, D. To kill all known viruses and bacteria
Answer: B
Conceptual Explanation: Neutral cleaners have a pH of around 7.0 and are designed to
remove soil without reacting with or dulling the floor finish.
5. When stripping a floor, why is it critical to use cold or room-temperature water rather than
hot water?
A. Hot water makes the floor too slippery
B. Hot water can cause the chemical to evaporate too quickly and create dangerous fumes
C. Cold water helps the wax harden for easier removal
D. Hot water damages the electric buffer motor
Answer: B
Conceptual Explanation: Stripping chemicals are highly volatile; hot water increases the
rate of evaporation, leading to toxic inhalation hazards and reducing the chemical’s
effectiveness.
6. What is the specific OSHA requirement for the ‘ladder ratio’ when leaning a straight ladder
against a wall?
A. 2:1 ratio
B. 4:1 ratio
C. 3:1 ratio
