NSC Chemical Safety 4

Question 1

Which of the following best describes a 'threshold limit value' (TLV) for airborne chemicals?

Accepted Answer

An ACGIH recommended guideline for airborne concentration levels

Answer

TLVs are advisory occupational exposure guidelines published by ACGIH (American Conference of Governmental Industrial Hygienists), not legally enforceable limits.

Question 2

What is the correct method for disposing of a small amount of used solvent-soaked rags in the workplace?

Accepted Answer

Place them in a self-closing, approved flammable waste container

Answer

Solvent-soaked rags must be stored in self-closing, approved flammable waste containers to prevent spontaneous combustion and fire hazards.

Question 3

A corrosive chemical is one that:

Accepted Answer

Destroys living tissue or degrades materials on contact

Answer

Corrosive chemicals cause destruction of living tissue (skin, eyes, mucous membranes) or material degradation on contact.

Question 4

When is it acceptable to eat, drink, or apply cosmetics in an area where hazardous chemicals are used?

Accepted Answer

Only during designated break times away from the chemical area

Answer

Eating, drinking, and applying cosmetics should only occur in designated areas away from hazardous chemical zones to prevent accidental ingestion of contaminants.

Question 5

What does a Hazardous Materials Information System (HMIS) rating of '3' in the health category mean?

Accepted Answer

Serious health hazard — major injury possible with short-term exposure

Answer

An HMIS health rating of 3 indicates a serious hazard where short-term exposure could cause serious, temporary or moderate residual injury.

NSC Practice Test

NSC Practice Test

NSC Chemical Safety 4