Struck-by, caught-in, hand tools and PPE on a construction site

Pick an answer. A short note for each option, A to D, appears here.

1. ATint addresses glare from welding light, not the flying particles that grinding throws.
2. BGrinding creates impact hazards rather than welding radiation, so a shade 10 helmet is unnecessary and limits visibility.
3. CCorrect: Face shields are secondary protectors and must be worn over primary eye protection such as safety glasses or goggles.
4. DA Z87.1 marking does not turn a face shield into primary eye protection, since particles can get under or around it.

Pick an answer. A short note for each option, A to D, appears here.

1. ACorrect: Exposed moving parts such as chains must be guarded, and a fixed guard keeps hands out regardless of worker behavior.
2. BGloves can be caught by a chain drive and pull the hand into it, so they add risk rather than removing it.
3. CRetraining depends on every worker staying alert, and it leaves the unguarded drive that caused the injury in place.
4. DPaint and signs warn about the hazard but do nothing to keep hands out of the chain drive.

Pick an answer. A short note for each option, A to D, appears here.

1. ABanding pallets together does not correct a stack leaning on soft, uneven ground.
2. BCaution tape warns people away but leaves an unstable stack that can topple onto the walkway.
3. CCorrect: Materials stored in tiers must be stacked and secured so they cannot slide, fall or collapse, which starts with a firm, level base at a stable height.
4. DRerouting foot traffic accepts the unstable stack instead of fixing the footing that causes it to lean.

Pick an answer. A short note for each option, A to D, appears here.

1. ATelling workers to watch out relies on attention and leaves pedestrians crossing an active forklift route.
2. BSpotters add labor and still leave workers carrying ladders across forklift traffic.
3. CA toolbox topic is an administrative step that leaves the basic layout conflict in place.
4. DCorrect: Relocating the staging area removes the pedestrian-forklift crossing, which ranks higher in the hierarchy of controls than warnings or spotters.

Pick an answer. A short note for each option, A to D, appears here.

1. ASafety glasses protect the eyes if a nail flies but do not prevent unintended discharge.
2. BLowering air pressure affects driving depth, not whether the tool bump-fires or double-fires.
3. CTraining helps, but it is an administrative control and weaker than an engineered trigger design.
4. DCorrect: A full sequential trigger fires only when the safety contact is pressed first and the trigger pulled second, preventing bump-fires and double-fires.

Pick an answer. A short note for each option, A to D, appears here.

1. ADischarge pipe supports must be designed for a 100 percent overload, so 50 percent understates the requirement.
2. BAn operator's judgment of pressure is not an engineered control and does not keep hose sections joined.
3. CFace shields and hard hats do not stop a whipping hose from striking workers.
4. DCorrect: Compressed air hoses on concrete pumping systems must have positive fail-safe joint connectors so sections cannot separate under pressure.

Pick an answer. A short note for each option, A to D, appears here.

1. ACorrect: Elimination removes the hazard from the workplace entirely, so workers cannot be exposed to it at all.
2. BAdministrative controls change how people work, which makes them depend on behavior and rank below elimination.
3. CPPE is the last line of defense because it protects only the wearer and only when used correctly.
4. DWarning signs inform people about a hazard but leave it in place, which ranks them well below elimination.

Pick an answer. A short note for each option, A to D, appears here.

1. ACorrect: Toeboards or screens stop tools and materials at the edge, protecting everyone below rather than relying on warnings.
2. BSigns warn people about overhead work but do nothing to keep objects from falling off the deck.
3. CVerbal warnings depend on timing and attention, and two drops have already happened this week.
4. DHard hats are still required but only reduce injury after something strikes; they do not keep objects from falling.

Pick an answer. A short note for each option, A to D, appears here.

1. AA glove that resisted one solvent may be permeated quickly by another, so past use is not a valid guide.
2. BCut-resistance ratings measure mechanical protection only and say nothing about chemical permeation.
3. CCorrect: Glove protection is chemical-specific, so SDS Section 8 and permeation data for that exact chemical identify the right material and change-out time.
4. DNitrile resists many chemicals but fails against some ketones and chlorinated solvents, so it cannot be assumed.

Pick an answer. A short note for each option, A to D, appears here.

1. ACorrect: Guards must stay in place on tools designed to use them, so cutting stops until the table saw's guard is reinstalled and working.
2. BA face shield and gloves do not prevent blade contact or kickback, and gloves near a blade can be pulled in.
3. CCoaching later leaves the carpenter exposed to blade contact and kickback for the rest of the cutting.
4. DA push stick supplements the guard but does not replace it, so blade exposure and kickback risk remain.

Pick an answer. A short note for each option, A to D, appears here.

1. ASigns warn about materials in walkways but accept blocked exits instead of preventing them.
2. BCorrect: A delivery and laydown plan with set staging areas prevents materials from landing in walkways and exits in the first place.
3. CNight deliveries shift the timing of the problem without deciding where loads will be placed.
4. DClearing walkways after each delivery is reactive and leaves exits blocked between cleanups.

Pick an answer. A short note for each option, A to D, appears here.

1. ACarrying a load high raises the center of gravity and increases tip-over risk; loads travel low.
2. BCorrect: Separating pedestrians from moving equipment is the strongest layout control when there is no room to pass safely, so the corridor is cleared for the move.
3. CA backup alarm only warns, and workers on ladders in a narrow corridor may not be able to get clear.
4. DA horn warns people who may be unable to react in time from a ladder in a tight space.

Pick an answer. A short note for each option, A to D, appears here.

1. AThin cut-off wheels are not designed for side loading, and side grinding with them can cause a burst.
2. BRemoving the guard is a common cause of serious face and hand injuries when a wheel shatters.
3. COvertightening the flange nut can crack the wheel and set up the very failure the check is meant to prevent.
4. DCorrect: A wheel run faster than its rated speed can burst, so its marked maximum speed must equal or exceed the grinder's no-load RPM.

Pick an answer. A short note for each option, A to D, appears here.

1. AUnder multi-employer rules the controlling contractor must coordinate hazards one crew creates for another, so leaving each foreman to his own crew misses the overhead exposure.
2. BHard hats reduce injury from small falling objects but will not stop a dropped bolt bag or steel piece; PPE is the last line, not a substitute for separation.
3. CA caution sign is only a warning, the weakest measure here, and does nothing to keep falling objects off the electricians below.
4. DCorrect: Keeping workers out from under overhead work removes the exposure entirely, which ranks above PPE and warnings in the hierarchy of controls.

Pick an answer. A short note for each option, A to D, appears here.

1. ABetween rollers the belt runs in a straight span with no converging surfaces, so the in-running nip hazard is low there.
2. BThe control box presents electrical hazards and should be closed and grounded, but it creates no caught-in point.
3. CFixed frame members do not move, so they pose bump or contact hazards rather than caught-in hazards.
4. DCorrect: In-running nip points form where a moving belt converges with a pulley or roller, which is why those points must be guarded.

Pick an answer. A short note for each option, A to D, appears here.

1. ASigns rely on people noticing and still route them through the debris zone.
2. BCorrect: Screening the work and moving the walkway separates people from flying chips, which ranks above signs, timing, and PPE.
3. CSafety glasses protect only the eyes of those who wear them and leave the rest of the body exposed to chips.
4. DWorking during low traffic still leaves some people passing through the debris zone.

Pick an answer. A short note for each option, A to D, appears here.

1. ARubber insulating gloves are electrical PPE and are damaged by sharp material.
2. BCotton knit gloves give grip but slice easily on sharp sheet metal.
3. CDisposable nitrile gloves protect against some chemicals but offer little cut resistance.
4. DCorrect: PPE is matched to the specific hazard, so sharp edges call for gloves rated for cut resistance.

Pick an answer. A short note for each option, A to D, appears here.

1. AAdding lights only after complaints means crews work in the dark until someone speaks up.
2. BHeadlamps light only where the worker is looking and do not show edges, openings, or equipment paths.
3. CExperience does not overcome the inability to see hazards.
4. DCorrect: Area lighting for work zones and travel paths, set up before work starts, lets workers and operators see hazards from the outset.