26 Hazards, Refueling & Battery Charging Practice Questions & Answers
Every Hazards, Refueling & Battery Charging practice question from the Forklift Operator (OSHA) Practice Test, with the correct answer and a short explanation.
Start practice test →1. Under 29 CFR 1910.178(g)(2), facilities shall be provided in a battery charging installation for all of the following EXCEPT:
- A.Protecting the charging apparatus from damage by trucks
- B.Adequate ventilation for dispersal of fumes from gassing batteries
- C.An on-site medical treatment room staffed by a licensed nurse✓ Answer
- D.Flushing and neutralizing spilled electrolyte
The standard lists exactly four required facilities: flushing/neutralizing spilled electrolyte, fire protection, protecting the charging apparatus from truck damage, and adequate ventilation for gassing fumes. A staffed medical room is not among them because the hazards addressed are chemical burns, fire, physical damage, and hydrogen accumulation.
Source: 29 CFR 1910.178(g)(2)Report a problem with this question
2. Where does OSHA permit battery charging to be performed?
- A.Inside a trailer or container while it is being loaded
- B.Only in areas specifically designated for battery charging✓ Answer
- C.Anywhere a suitable electrical outlet is available
- D.In any aisle, provided cones are set out around the truck
1910.178(g)(1) requires charging installations to be located in areas designated for that purpose, because only a designated area can be equipped in advance with the ventilation, fire protection, flushing/neutralizing means, and barriers the standard demands.
Source: 29 CFR 1910.178(g)(1)Report a problem with this question
3. When electrolyte is being mixed for battery service, what is the correct procedure?
- A.Add half the water, then the acid, then the rest of the water
- B.Pour the acid into the water✓ Answer
- C.Either order is acceptable if poured slowly
- D.Pour the water into the acid
1910.178(g) states that acid shall be poured into water and water shall never be poured into acid. The dilution reaction is strongly exothermic; pouring water onto concentrated acid causes localized boiling that violently spatters corrosive acid onto the worker.
Source: 29 CFR 1910.178(g)(7)Report a problem with this question
4. Which statement correctly contrasts the gas given off by charging lead-acid batteries with LP-gas vapor?
- A.Both are heavier than air and collect at floor level
- B.Both are lighter than air and collect at the ceiling
- C.Hydrogen is lighter than air and collects near the ceiling; LP-gas vapor is heavier than air and pools in pits and low areas✓ Answer
- D.Hydrogen is heavier than air; LP-gas vapor is lighter than air
Charging batteries electrolyze water and vent hydrogen, which is lighter than air and rises to the ceiling, and which is explosive at about 4% in air — this is why 1910.178(g)(2) requires ventilation for dispersal of those fumes. LP-gas vapor behaves oppositely, sinking into pits and low spots, so the two hazards require ventilation at opposite levels.
Source: 29 CFR 1910.178(g)(2); OSHA PIT eTool, Power SourcesReport a problem with this question
5. While a lead-acid battery is charging, what does 1910.178(g) require regarding the battery cover and vent caps?
- A.Close and latch the cover so fumes are contained inside the compartment
- B.Remove the vent caps entirely and set them aside until charging ends
- C.Drape a tarp over the battery to keep dust off the terminals
- D.Open the battery (or compartment) cover and make sure the vent caps are functioning✓ Answer
The standard requires that care be taken to assure vent caps are functioning and that the battery or compartment cover be open to dissipate heat. A closed cover traps both heat and the hydrogen being vented, creating an explosive atmosphere directly over the cells.
Source: 29 CFR 1910.178(g)(8)Report a problem with this question
6. Which rule applies to ignition sources in a battery charging area?
- A.Open flame work is allowed as long as the battery cover is closed
- B.Smoking is prohibited, and precautions must be taken to prevent open flames, sparks, and electric arcs✓ Answer
- C.Only lit matches are prohibited; lighters and grinders are acceptable
- D.Smoking is permitted if the smoker stands at least 25 feet from the charger
1910.178(g) prohibits smoking in the charging area and requires precautions against open flames, sparks, and electric arcs. Any of these can ignite the hydrogen released during charging, and hydrogen needs only a very weak ignition source to explode.
Source: 29 CFR 1910.178(g)(9) and (g)(10)Report a problem with this question
7. According to 1910.178(g), how must tools and other metallic objects be handled around batteries?
- A.They shall be kept away from the top of uncovered batteries✓ Answer
- B.They may be laid on top of the battery so they are not misplaced
- C.They may be touched across the terminals to test for a charge
- D.They should be stored inside the battery compartment for convenience
The standard requires tools and other metallic objects to be kept away from the top of uncovered batteries. A metal object bridging two terminals shorts thousands of amperes, producing an arc and intense heat that can rupture the case and ignite the hydrogen above the cells.
Source: 29 CFR 1910.178(g)(11)Report a problem with this question
8. What does 1910.178(g) require for handling industrial batteries during a battery change?
- A.Rolling the battery off the truck deck onto the floor
- B.Two or more employees lifting the battery by hand
- C.A rope sling with two hooks pulled by hand
- D.A conveyor, overhead hoist, or equivalent material handling equipment✓ Answer
The standard requires a conveyor, overhead hoist, or equivalent material handling equipment for handling batteries, because industrial batteries commonly weigh one to several thousand pounds — far beyond safe manual handling and heavy enough to crush a foot or rupture and spill acid.
Source: 29 CFR 1910.178(g)(3)Report a problem with this question
9. What must be provided for handling electrolyte?
- A.A compressed air blow line
- B.A metal funnel and an open bucket
- C.A carboy tilter or siphon✓ Answer
- D.An open pitcher poured by hand
1910.178(g) requires a carboy tilter or siphon for handling electrolyte. These devices let the container be emptied under control without lifting or hand-tipping a heavy acid carboy, which is how most splash burns occur; a metal funnel would also corrode and could short cells.
Source: 29 CFR 1910.178(g)(5)Report a problem with this question
10. Before changing or charging a battery, what does the standard require of the truck itself?
- A.The forks must be raised to full height for access
- B.The key must be left on so the dash lights stay illuminated
- C.The truck should be parked on a ramp so fluids drain away
- D.The truck must be properly positioned and the brake applied✓ Answer
1910.178(g) requires that trucks be properly positioned and the brake applied before changing or charging a battery. Shifting a truck weighing thousands of pounds while a hoist is over an open battery could unseat the battery, break the connector, or crush a worker.
Source: 29 CFR 1910.178(g)(6)Report a problem with this question
11. Which set of personal protective equipment does OSHA guidance specify for employees changing, charging, or servicing batteries?
- A.Cloth work gloves and a disposable dust mask
- B.A hard hat and hearing protection only
- C.Chemical splash goggles or a face shield, acid-resistant gloves, and an acid-resistant apron✓ Answer
- D.Safety glasses alone are sufficient for all battery work
OSHA guidance for battery work, consistent with the PPE duties in 1910.132 and eye/face protection in 1910.133, calls for splash goggles or a face shield plus acid-resistant gloves and apron. Safety glasses alone leave the face and the sides of the eyes open to a splash of corrosive sulfuric acid electrolyte.
Source: 29 CFR 1910.132 and 1910.133; OSHA PIT eTool, battery PPE guidanceReport a problem with this question
12. A lead-acid battery's electrolyte level is low. When should water be added, and what kind?
- A.Add tap water before charging so the plates stay covered
- B.Add distilled water after the charge cycle is complete✓ Answer
- C.Add distilled water before charging begins
- D.Add fresh acid rather than water to restore the level
Water is added after charging, and only distilled water. Electrolyte expands and gases during the charge, so topping off beforehand causes acid to overflow onto the truck and floor; tap-water minerals and adding acid instead of water both damage the cells.
Source: 29 CFR 1910.178(g); OSHA PIT eTool, battery maintenance guidanceReport a problem with this question
13. What is the correct practice when connecting or disconnecting a charger plug to a battery?
- A.It makes no difference, because the battery is the power source
- B.Turn the charger off before connecting or disconnecting the connector✓ Answer
- C.Leave the charger switched on so the connection can be verified immediately
- D.Disconnect under load first so the cables discharge
OSHA guidance is to switch the charger off before making or breaking the connection. Breaking a connector under load draws a visible arc, and that arc occurs in exactly the hydrogen-rich space above a gassing battery, which is why 1910.178(g) also requires precautions against sparks and arcs in charging areas.
Source: 29 CFR 1910.178(g)(10); OSHA PIT eTool, charging guidanceReport a problem with this question
14. The data plate of an electric counterbalanced truck specifies a minimum battery weight. What is the effect of installing a lighter replacement battery?
- A.It is acceptable as long as the operator drives more slowly
- B.None; battery weight is only a material-handling concern
- C.It increases capacity because the truck's gross weight is lower
- D.It reduces the counterweight effect and invalidates the rated capacity, making it a modification requiring the manufacturer's prior written approval✓ Answer
On an electric counterbalanced truck the battery forms part of the counterweight, so a lighter battery shifts the balance point forward and the capacity/load-center rating on the data plate no longer applies. 1910.178(a)(4) forbids modifications affecting capacity or safe operation without the manufacturer's prior written approval.
Source: 29 CFR 1910.178(a)(4); (e)(4) data plate requirementsReport a problem with this question
15. Employees perform battery maintenance, including watering cells and handling electrolyte. What does 29 CFR 1910.151(c) require in that work area?
- A.Nothing additional, because PPE substitutes for emergency facilities
- B.Only a bottle of neutralizing solution
- C.Suitable facilities for quick drenching or flushing of the eyes and body, within the work area, for immediate emergency use✓ Answer
- D.Only a stocked first aid kit
1910.151(c) requires quick-drenching or flushing facilities where employees may be exposed to injurious corrosive materials, and OSHA has applied this to battery maintenance because sulfuric acid keeps burning tissue until it is diluted away — seconds of delay determine the severity of the injury. OSHA has interpreted charging-only operations with no maintenance differently, so the trigger here is the maintenance work.
Source: 29 CFR 1910.151(c); OSHA interpretations on drenching/flushing at battery charging areasReport a problem with this question
16. What does 1910.178(p) require about the engine when a fuel tank is being filled?
- A.The engine may run as long as the operator stays in the seat
- B.The engine may idle so the battery keeps charging
- C.The engine must be running to equalize tank pressure
- D.The engine must be shut off; fuel tanks shall not be filled while the engine is running✓ Answer
1910.178(p) states plainly that fuel tanks shall not be filled while the engine is running and that spillage shall be avoided. A running engine supplies hot exhaust and manifold surfaces plus ignition-system sparks right next to fuel vapor, which is the ignition scenario refueling rules exist to prevent.
Source: 29 CFR 1910.178(p)(2)Report a problem with this question
17. Fuel is spilled on a truck during refueling. What does the standard require before the engine is restarted?
- A.Start the engine and drive the truck away from the spill area
- B.Wash away or completely evaporate the spillage and replace the fuel tank cap before restarting✓ Answer
- C.Replace the cap and restart; clean up the spill at the end of the shift
- D.Cover the spill with absorbent and continue working
The standard requires spilled oil or fuel to be carefully washed away or completely evaporated and the fuel tank cap replaced before restarting the engine. Cranking the engine over a fuel-wetted truck puts an ignition source into a vapor cloud, and an uncapped tank keeps feeding that vapor.
Source: 29 CFR 1910.178(p)(3)Report a problem with this question
18. Which of the following requires that a powered industrial truck be taken out of service until the condition is corrected?
- A.Operation at a temperature above the truck's normal operating temperature
- B.A leak in the fuel system
- C.Emission of hazardous sparks or flames from the exhaust
- D.All of these conditions require removal from service✓ Answer
1910.178(q) bars operating a truck with a fuel-system leak until it is corrected, requires immediate removal of a truck emitting hazardous sparks or flames from the exhaust, and requires removal of a truck running above its normal operating temperature. Each is an ignition or fire pathway, and 1910.178(p)(1) independently requires any unsafe truck to be taken out of service.
Source: 29 CFR 1910.178(q)(5), (q)(9), (q)(10); 1910.178(p)(1)Report a problem with this question
19. Under 1910.178(f), which codes govern the storage and handling of forklift fuels?
- A.Both fuels under NFPA 70, the National Electrical Code
- B.Neither fuel is addressed by 1910.178; only state fire codes apply
- C.Liquid fuels under NFPA 58; LP-gas under NFPA 30
- D.Liquid fuels under the NFPA Flammable and Combustible Liquids Code (NFPA 30); LP-gas under the NFPA Storage and Handling of Liquefied Petroleum Gases standard (NFPA 58)✓ Answer
1910.178(f) incorporates the NFPA Flammable and Combustible Liquids Code for gasoline and diesel and the NFPA LP-Gas storage and handling standard for propane. The two fuels are governed separately because a liquid pooling in a diked area and a pressurized liquefied gas that flashes to heavier-than-air vapor demand different controls.
Source: 29 CFR 1910.178(f)(1) and (f)(2)Report a problem with this question
20. When mounting an LP-gas cylinder on a forklift, what is the correct practice?
- A.Any orientation is acceptable as long as the retaining strap is tight
- B.Seat the cylinder on its locating pin so the pressure relief valve points upward into the vapor space, and secure the retaining bracket✓ Answer
- C.Remove the locating pin so the cylinder can rotate freely on its bracket
- D.Mount the cylinder with the relief valve pointing down so liquid can escape first
The locating pin exists to force one orientation, with the pressure relief valve in the vapor space at the top of the cylinder. If the relief valve opens while submerged in liquid propane, it discharges liquid that expands roughly 270 times into a heavy, ground-hugging flammable cloud instead of venting vapor.
Source: 29 CFR 1910.178(f)(2) and 1910.110; OSHA PIT eTool, LPG cylinder handlingReport a problem with this question
21. An operator smells the rotten-egg odorant near an LP-gas coupling. How should the connection be checked for a leak?
- A.Pass an open flame along the coupling and watch for a change in the flame
- B.Loosen the coupling further until the hissing stops
- C.Trace the hose with a lighted match
- D.Apply soapy water or an approved leak-detection solution and watch for bubbles✓ Answer
Leaks are located with soapy water or an approved leak-detection solution, never with a flame — 1910.178(p) expressly prohibits open flames for checking electrolyte level or fuel level, and the same logic applies to any fuel leak check. The correct response to a confirmed leak is to close the service valve, eliminate ignition sources, ventilate, and remove the truck from service until repaired.
Source: 29 CFR 1910.178(p)(4); 1910.178(q)(5)Report a problem with this question
22. How should spare LP-gas cylinders be stored?
- A.Upright and secured in a designated area away from heat sources, exits, and stairways, outdoors where feasible✓ Answer
- B.In a covered pit so they are shielded from direct sunlight
- C.Lying on their sides on a stairway landing so they are close at hand
- D.In the basement mechanical room next to the furnace, where they stay dry
LP-gas storage under 1910.178(f)(2) and 1910.110 keeps cylinders upright and secured, away from heat and away from exits and stairways. Upright storage keeps the relief valve in vapor space, and low or enclosed locations such as pits and basements are the worst choice because leaking propane vapor is heavier than air and settles there; blocked exits also trap people during a fire.
Source: 29 CFR 1910.178(f)(2); 29 CFR 1910.110Report a problem with this question
23. A work area is a classified hazardous location. Which trucks may be operated there?
- A.Any truck, provided a fire extinguisher is carried on board
- B.Any diesel truck fitted with a spark arrestor
- C.Only trucks of a designated type approved for that class and division of hazardous location✓ Answer
- D.Any electric truck, because electric trucks have no exhaust
1910.178(m) allows only approved trucks in hazardous locations, and Table N-1 in 1910.178(d) matches designated types (such as D, DS, DY, E, ES, EE, EX, G, GS, LP, LPS) to each class and division. Electric trucks are not automatically safe — motors, controllers, and connectors arc — which is why the specially protected EX designation exists.
Source: 29 CFR 1910.178(m)(3); 1910.178(d) Table N-1; 1910.178(b)Report a problem with this question
24. An atmosphere contains hazardous concentrations of acetylene, butadiene, ethylene oxide, or hydrogen. Which powered industrial trucks may be operated in it?
- A.DY trucks only, since they have no electrical equipment
- B.Any truck carrying the 'S' safeguard suffix
- C.EX trucks only, since they are explosion-protected
- D.None — no powered industrial truck of any designation may be used✓ Answer
1910.178 imposes an absolute prohibition for atmospheres with hazardous concentrations of acetylene, butadiene, ethylene oxide, hydrogen, or gases of equivalent hazard, and for hazardous concentrations of metal dust. These gases ignite at extremely low energy and have very wide flammable ranges, so no protective design — not even EX — is accepted; EX trucks are, however, the designation permitted around combustible metal dusts such as aluminum and magnesium.
Source: 29 CFR 1910.178(d) Table N-1 and accompanying notes; 1910.178(m)(3)Report a problem with this question
25. Which statement about carbon monoxide from powered industrial truck operations is correct?
- A.All internal combustion trucks — gasoline, diesel, and LP-gas — produce it; it is colorless and odorless, and concentrations must not exceed the limits in 1910.1000 (50 ppm as an 8-hour TWA)✓ Answer
- B.It has a sharp odor that warns operators before levels become dangerous
- C.Only diesel trucks produce it; gasoline and propane trucks burn clean
- D.It is not a concern indoors as long as dock doors are kept closed
1910.178(i) ties CO from truck operations to the limits in 1910.1000, where the permissible exposure limit is 50 ppm as an 8-hour time-weighted average. Every internal combustion engine — including propane — produces CO through incomplete combustion, and because the gas is colorless and odorless, closing doors in cold weather removes the ventilation that keeps levels down rather than keeping exhaust out.
Source: 29 CFR 1910.178(i)(1); 29 CFR 1910.1000 Table Z-1 (carbon monoxide, 50 ppm 8-hr TWA)Report a problem with this question
26. Which housekeeping and fire-prevention requirement applies to powered industrial trucks under 1910.178(q)?
- A.Trucks shall be kept clean and free of lint, excess oil, and grease, and solvents with a flash point below 100 °F shall not be used for cleaning✓ Answer
- B.Cleaning is required only when the truck is scheduled for major repair
- C.Gasoline is an acceptable cleaner because it is already present on the truck
- D.Accumulated grease is a cosmetic issue only and may be addressed at annual service
1910.178(q) requires trucks to be kept clean and free of lint, excess oil, and grease, and permits only noncombustible agents or solvents with a flash point at or above 100 °F for cleaning. Lint and oil films are the fuel that turns a hot exhaust component or an electrical arc into a truck fire, and a low-flash-point solvent supplies its own ignitable vapor.
Source: 29 CFR 1910.178(q)(12)Report a problem with this question
Practice questions modeled on the OSHA Powered Industrial Trucks standard (29 CFR 1910.178). Not affiliated with or endorsed by OSHA. Passing this practice test does not certify you to operate a forklift — federal law requires your employer to provide formal training and a hands-on evaluation. Always follow OSHA rules and your workplace procedures. Study the official standard at osha.gov. OSHA standard →