NYC Custodian Test 2026 | Latest Update | Questions &
Answers | Exam Prep PDF | Graded A+
1. In a scenario where a kitchen has heavy grease buildup on the countertops,
which cleaning agent would be most effective and why?
Vinegar, because it neutralizes odors.
Water, because it can dilute the grease.
TriSodium phosphate, because it is specifically used as a degreaser.
Baking soda, because it absorbs grease.
2. Why is it important to avoid drenching linoleum while mopping?
Drenching linoleum prevents the growth of mold and mildew.
Drenching linoleum helps in better cleaning and maintenance.
Drenching linoleum is necessary for disinfecting the surface.
Drenching linoleum can damage the material and lead to
deterioration.
3. What is sodium silicate commonly used for in custodial work?
Metal rust prevention
Glass cleaning
Wood polishing
Concrete treatment
4. Describe the types of fires that Class D fire extinguishers are intended to
extinguish and why they are specialized for these materials.
, Class D fire extinguishers are used for all types of fires, including
those involving wood and paper.
Class D fire extinguishers are designed for electrical fires involving
wiring and appliances.
Class D fire extinguishers are intended for fires involving
combustible metals, such as magnesium, potassium, and titanium,
because these metals react differently to water and other
extinguishing agents.
Class D fire extinguishers are primarily used for flammable liquids like
gasoline and oil.
5. What is the primary application of linseed oil in custodial work?
As a lubricant for machinery.
As a disinfectant for bathroom fixtures.
As a cleaning agent for glass surfaces.
As a drying oil for wood finishes and in the manufacturing of
linoleum.
6. If a custodial worker accidentally spills gasoline while cleaning, which type of
fire extinguisher should they use to safely address a fire that may arise from
this situation?
Class B fire extinguisher
Class D fire extinguisher
Class A fire extinguisher
Class C fire extinguisher
7. Why is it important to use neutral cleaners on Terazzo flooring?
, Neutral cleaners enhance the shine of the Terazzo.
Neutral cleaners are easier to find.
Neutral cleaners are more cost-effective.
Neutral cleaners prevent damage to the Terazzo surface.
8. Describe the role of linseed oil in the maintenance of wooden surfaces.
Linseed oil is used to remove stains from wood.
Linseed oil serves as a drying oil that enhances the finish and
protects wooden surfaces.
Linseed oil is primarily used to clean and disinfect wooden surfaces.
Linseed oil is a type of paint used for coloring wood.
9. Trisodium Phosphate (TSP) when used before a joint is brazed, is to primarily:
prevent oxide from forming
remove surface scale
flux the surface
remove oil or grease
10. If a custodian needs to improve the durability of a concrete floor in a high-
traffic area, which cleaning agent should they consider using?
Sodium silicate
Bleach
Dish soap
Vinegar
Answers | Exam Prep PDF | Graded A+
1. In a scenario where a kitchen has heavy grease buildup on the countertops,
which cleaning agent would be most effective and why?
Vinegar, because it neutralizes odors.
Water, because it can dilute the grease.
TriSodium phosphate, because it is specifically used as a degreaser.
Baking soda, because it absorbs grease.
2. Why is it important to avoid drenching linoleum while mopping?
Drenching linoleum prevents the growth of mold and mildew.
Drenching linoleum helps in better cleaning and maintenance.
Drenching linoleum is necessary for disinfecting the surface.
Drenching linoleum can damage the material and lead to
deterioration.
3. What is sodium silicate commonly used for in custodial work?
Metal rust prevention
Glass cleaning
Wood polishing
Concrete treatment
4. Describe the types of fires that Class D fire extinguishers are intended to
extinguish and why they are specialized for these materials.
, Class D fire extinguishers are used for all types of fires, including
those involving wood and paper.
Class D fire extinguishers are designed for electrical fires involving
wiring and appliances.
Class D fire extinguishers are intended for fires involving
combustible metals, such as magnesium, potassium, and titanium,
because these metals react differently to water and other
extinguishing agents.
Class D fire extinguishers are primarily used for flammable liquids like
gasoline and oil.
5. What is the primary application of linseed oil in custodial work?
As a lubricant for machinery.
As a disinfectant for bathroom fixtures.
As a cleaning agent for glass surfaces.
As a drying oil for wood finishes and in the manufacturing of
linoleum.
6. If a custodial worker accidentally spills gasoline while cleaning, which type of
fire extinguisher should they use to safely address a fire that may arise from
this situation?
Class B fire extinguisher
Class D fire extinguisher
Class A fire extinguisher
Class C fire extinguisher
7. Why is it important to use neutral cleaners on Terazzo flooring?
, Neutral cleaners enhance the shine of the Terazzo.
Neutral cleaners are easier to find.
Neutral cleaners are more cost-effective.
Neutral cleaners prevent damage to the Terazzo surface.
8. Describe the role of linseed oil in the maintenance of wooden surfaces.
Linseed oil is used to remove stains from wood.
Linseed oil serves as a drying oil that enhances the finish and
protects wooden surfaces.
Linseed oil is primarily used to clean and disinfect wooden surfaces.
Linseed oil is a type of paint used for coloring wood.
9. Trisodium Phosphate (TSP) when used before a joint is brazed, is to primarily:
prevent oxide from forming
remove surface scale
flux the surface
remove oil or grease
10. If a custodian needs to improve the durability of a concrete floor in a high-
traffic area, which cleaning agent should they consider using?
Sodium silicate
Bleach
Dish soap
Vinegar
