BACE: Safety & Workplace Culture Practice Questions & Answers

The Hierarchy of Controls lists PPE as the last line of defense and the least effective control measure because it relies on human behavior and does not remove the hazard itself. The order from most to least effective is: Elimination, Substitution, Engineering Controls, Administrative Controls, PPE.

The NFPA 704 diamond uses colors to denote hazards: Blue = Health, Red = Flammability, Yellow = Instability/Reactivity, and White = Special Hazards.

BSL-2 is designated for agents associated with human disease that pose a moderate health hazard. BSL-1 is for non-pathogenic agents, while BSL-3 and BSL-4 are for serious or lethal agents transmitted via inhalation.

Section 4 of the SDS contains First-Aid Measures, which provide initial care instructions for untrained responders attending to an individual who has been exposed to the chemical.

PASS is the standard mnemonic for fire extinguisher use: Pull the pin, Aim at the base of the fire, Squeeze the handle, Sweep from side to side.

The 'Health Hazard' pictogram (a silhouette of a human with a white star shape on the chest) indicates chronic health hazards such as carcinogenicity, mutagenicity, respiratory sensitization, or reproductive toxicity.

Nitrile gloves offer superior chemical resistance to many organic solvents compared to latex or vinyl. However, for specific highly aggressive chemicals, the SDS must always be consulted to verify glove compatibility.

Glass items contaminated with biological agents (like a bacterial smear) are considered biohazardous sharps. They must be disposed of in a rigid, puncture-resistant biohazard sharps container, not the clean broken glass box.

The first priority in any unknown spill is safety and containment. You must alert others to keep them away, isolate the area, and notify a supervisor or safety officer who can properly identify the hazard before cleanup begins.

BSL-3 laboratories require sustained directional airflow (negative pressure relative to the corridor) and HEPA-filtered exhaust air to prevent aerosol escape. BSL-2 labs generally do not require negative pressure unless specific hazards dictate it.