OSHA 30-Hour Construction Exam
Fire Protection Practice Questions
25 practice questions with detailed explanations — aligned to the OSHA 30-Hour Construction Exam.
Q1.What class of fire extinguisher is used for ordinary combustible materials such as wood, paper, and cloth?
A.Class AB.Class BC.Class CD.Class DA. Class AExplanation: Class A fire extinguishers are designed for fires involving ordinary combustible materials such as wood, paper, cloth, rubber, and many plastics. They typically use water or dry chemical agents.
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Q2.What class of fire extinguisher should be used on fires involving flammable liquids such as gasoline, oil, and grease?
A.Class AB.Class BC.Class CD.Class KB. Class BExplanation: Class B fire extinguishers are rated for fires involving flammable and combustible liquids, including gasoline, oil, grease, lacquers, and similar materials.
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Q3.What does the 'P' stand for in the PASS technique for using a fire extinguisher?
A.PushB.PullC.PointD.PressurizeB. PullExplanation: The PASS technique stands for Pull the pin, Aim the nozzle at the base of the fire, Squeeze the handle, and Sweep side to side. Pulling the pin is the critical first step to activate the extinguisher.
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Q4.How far apart must fire extinguishers be placed on a construction site, at a maximum?
A.50 feet of travelB.75 feet of travelC.100 feet of travelD.150 feet of travelC. 100 feet of travelExplanation: OSHA requires that fire extinguishers be placed so that the maximum travel distance to the nearest extinguisher is no more than 100 feet. This ensures workers can quickly access one in an emergency.
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Q5.A fire prevention plan must be in writing when required by which of the following?
A.An OSHA standard applicable to the workplaceB.The general contractor onlyC.Local fire departmentsD.Insurance carriersA. An OSHA standard applicable to the workplaceExplanation: An employer must have a written fire prevention plan when required by a particular OSHA standard. The plan must include a list of major fire hazards, proper handling and storage procedures, potential ignition sources, and fire protection equipment available.
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Q6.What is the primary purpose of a fire watch?
A.To call 911 immediately after a fire startsB.To monitor for fires during and after hot work operationsC.To inspect fire extinguishers monthlyD.To train workers on fire safetyB. To monitor for fires during and after hot work operationsExplanation: A fire watch is assigned to monitor the area during and for a specified period after hot work operations (such as welding and cutting) to detect and extinguish any smoldering fires. The fire watch must have fire extinguishing equipment readily available.
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Q7.What class of fire extinguisher is appropriate for fires involving energized electrical equipment?
A.Class AB.Class BC.Class CD.Class DC. Class CExplanation: Class C fire extinguishers are rated for fires involving energized electrical equipment. They use non-conductive extinguishing agents such as carbon dioxide or dry chemical to avoid electrical shock to the operator.
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Q8.What type of fire extinguisher is designed for combustible metal fires such as magnesium or titanium?
A.Class AB.Class BC.Class CD.Class DD. Class DExplanation: Class D fire extinguishers are specifically designed for fires involving combustible metals such as magnesium, titanium, sodium, and potassium. Using water or other standard agents on metal fires can cause a violent reaction.
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Q9.An employer must establish a firefighting program as part of which of the following?
A.Weekly toolbox talksB.The fire protection program on the construction siteC.Annual refresher trainingD.The bid proposalB. The fire protection program on the construction siteExplanation: The employer is responsible for the development and maintenance of an effective fire protection program at the construction site throughout all phases of construction. This includes providing firefighting equipment as specified by OSHA.
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Q10.When using the PASS technique, at what part of the fire should you aim the extinguisher nozzle?
A.The top of the flamesB.The middle of the flamesC.The base of the fireD.Above the flames to smother themC. The base of the fireExplanation: When using the PASS technique (Pull, Aim, Squeeze, Sweep), you should always aim the nozzle at the base of the fire. Aiming at the base attacks the fuel source directly, which is the most effective method of extinguishment.
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Q11.Flammable liquids must be stored in approved containers and kept away from ignition sources at a minimum distance of how many feet?
A.10 feetB.20 feetC.35 feetD.50 feetB. 20 feetExplanation: Flammable and combustible liquids shall be kept away from ignition sources and shall not be stored within 20 feet of a building being constructed. Proper storage, handling, and labeling are essential for fire prevention.
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Q12.How often must fire extinguishers be visually inspected on a construction site?
A.DailyB.WeeklyC.MonthlyD.AnnuallyC. MonthlyExplanation: OSHA requires that fire extinguishers be inspected at least monthly to ensure they are in their designated places, accessible, and fully charged. Annual maintenance and periodic hydrostatic testing are also required.
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Q13.What is the minimum duration a fire watch must remain after hot work (welding/cutting) operations are completed?
A.15 minutesB.30 minutesC.60 minutesD.90 minutesB. 30 minutesExplanation: A fire watch must be maintained for at least 30 minutes after completion of cutting or welding operations to detect and extinguish possible smoldering fires. This is a critical fire prevention measure during hot work.
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Q14.What is the maximum amount of flammable liquid that may be stored in an approved safety can?
A.1 gallonB.2 gallonsC.5 gallonsD.10 gallonsC. 5 gallonsExplanation: Approved safety cans for flammable liquids have a maximum capacity of 5 gallons. They must be equipped with a spring-closing lid and spout cover, and be designed to safely relieve internal pressure when subjected to fire exposure.
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Q15.A hot work permit is required before performing welding or cutting operations in areas where there is a risk of which of the following?
A.Noise exposure above 90 dBAB.Fire or explosion from flammable materialsC.Electrical shock from power linesD.Silica dust generationB. Fire or explosion from flammable materialsExplanation: Hot work permits are required when welding, cutting, or other hot work is performed in locations where there is a risk of fire or explosion due to the presence of flammable materials, combustible dust, or flammable atmospheres. The permit ensures proper precautions are taken.
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Q16.LPG (liquefied petroleum gas) cylinders stored on a construction site must be positioned at least how far from any building being constructed?
A.5 feetB.10 feetC.20 feetD.50 feetC. 20 feetExplanation: LPG containers must be stored at least 20 feet from buildings under construction. This distance provides a safety buffer against fire and explosion hazards from leaking or damaged cylinders near construction activities.
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Q17.What must be done with fire extinguishers that are removed from service for maintenance?
A.Discarded and replaced with new onesB.Replaced with a spare extinguisher while being servicedC.Marked with a red tag and left in placeD.Placed in a storage container until repairedB. Replaced with a spare extinguisher while being servicedExplanation: When fire extinguishers are removed from service for maintenance or recharging, the employer must provide equivalent replacement extinguishers to ensure workers remain protected during the servicing period.
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Q18.Where must no-smoking signs be posted on a construction site?
A.Only at the site entranceB.In or near areas where flammable or combustible materials are stored or usedC.Only in the break roomD.In the project manager's officeB. In or near areas where flammable or combustible materials are stored or usedExplanation: No-smoking signs or equivalent warnings must be conspicuously posted in areas where flammable or combustible materials are used or stored, at service and refueling areas, and at other locations as appropriate to prevent ignition of these materials.
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Q19.What is a Class K fire extinguisher specifically designed to combat?
A.Fires involving combustible metalsB.Fires involving energized electrical equipmentC.Fires involving cooking oils and fats in commercial kitchensD.Fires involving flammable gasesC. Fires involving cooking oils and fats in commercial kitchensExplanation: Class K fire extinguishers are specifically designed for fires involving cooking media such as vegetable oils, animal oils, and fats commonly found in commercial kitchens. They use a wet chemical agent that creates a foam blanket to prevent re-ignition.
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Q20.Portable heaters used on construction sites must be placed at least how far from combustible materials?
A.5 feetB.10 feetC.15 feetD.20 feetB. 10 feetExplanation: Temporary heating devices must be installed to provide clearance from combustible materials of not less than the clearance specified by their listing or a minimum of 10 feet from tarpaulins and other combustible coverings and materials.
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Q21.An emergency action plan must include which of the following elements?
A.A list of all employee birthdaysB.Procedures for emergency evacuation, including type of evacuation and exit route assignmentsC.Equipment maintenance schedulesD.Weekly payroll informationB. Procedures for emergency evacuation, including type of evacuation and exit route assignmentsExplanation: An emergency action plan must include evacuation procedures and exit route assignments, procedures for employees who remain to operate critical operations before evacuation, a system for accounting for all employees after evacuation, and the means for reporting emergencies.
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Q22.When performing welding operations, combustible materials must be relocated at least how far from the welding area, or protected by fire-resistant covers?
A.15 feetB.25 feetC.35 feetD.50 feetC. 35 feetExplanation: Where practical, all combustible materials must be relocated at least 35 feet from the work area during welding and cutting operations. Where relocation is impractical, combustibles must be protected with fire-resistant covers or guards and a fire watch posted.
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Q23.According to OSHA, the maximum quantity of flammable liquids that may be stored outside an approved storage cabinet in a single fire area is:
A.10 gallonsB.25 gallonsC.60 gallonsD.120 gallonsB. 25 gallonsExplanation: No more than 25 gallons of flammable liquids shall be stored in a room outside of an approved storage cabinet. Quantities exceeding this limit must be stored in approved flammable storage cabinets or in a designated flammable liquid storage area.
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Q24.During demolition operations, a fire protection plan must include all of the following EXCEPT:
A.Site plan indicating the location of available fire suppression equipmentB.Assignment of a person responsible for fire prevention during demolitionC.Procedures for notifying the local fire department before beginning workD.A list of subcontractor profit marginsD. A list of subcontractor profit marginsExplanation: The fire protection plan for demolition must include the location of fire suppression equipment, assignment of a responsible person for fire prevention, fire department notification procedures, and removal of hazardous materials. Financial information is not part of a fire protection plan.
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Q25.When an inside storage room is used to store flammable liquids, which of the following fire protection features is required?
A.A gravity-fed sprinkler system onlyB.A self-closing fire door, liquid-tight sill or ramp, and appropriate ventilationC.Fire extinguishers only if the room exceeds 500 square feetD.No specific requirements if quantities are below 100 gallonsB. A self-closing fire door, liquid-tight sill or ramp, and appropriate ventilationExplanation: Inside storage rooms for flammable liquids must have self-closing fire doors at all openings, a liquid-tight sill or 4-inch ramp at the door, proper mechanical or gravity ventilation, and be constructed with appropriate fire-resistance ratings based on the size and quantity stored.
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