OSHA 30-Hour Construction Outreach (knowledge check)
Fire protection and welding: practice questions
Our OSHA 30 Construction bank has 14 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
How much flammable liquid may be stored in a room outside an approved cabinet?
- No more than 60 gallons
- No more than 5 gallons
- No more than 25 gallons
- Any amount if the room is ventilated
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C. No more than 25 gallons — No more than 25 gallons of flammable liquids may be stored in a room outside an approved storage cabinet.
Question 2
How should a frozen gas cylinder be thawed?
- With a torch
- By prying it loose with a bar under the valve
- With boiling water
- With warm, not boiling, water
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D. With warm, not boiling, water — Warm, not boiling, water must be used to thaw cylinders loose; bars must not be used under valves or caps to pry them free.
Question 3
How close to a building may outdoor piles of flammable liquid containers be?
- No nearer than 20 feet
- No nearer than 5 feet
- No nearer than 100 feet
- Directly against the wall
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A. No nearer than 20 feet — Outdoor container storage may not exceed 1,100 gallons in one pile, piles must be separated by 5 feet, and no pile may be nearer than 20 feet to a building.
Question 4
How must compressed gas cylinders be kept on a construction site?
- Lying on their sides on a pallet, so they cannot fall over
- Secured upright, except briefly while being hoisted or carried
- Leaning against a wall
- Stacked in a pile or lying on their sides
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B. Secured upright, except briefly while being hoisted or carried — Compressed gas cylinders must be secured in an upright position at all times, except for short periods while actually being hoisted or carried.