CIH General 5

Question 1

What is the assigned protection factor (APF) for a full-face air-purifying respirator according to OSHA?

Accepted Answer

50

Answer

OSHA assigns an APF of 50 to full-face air-purifying respirators, meaning they can reduce exposure to 1/50th of ambient concentration.

Question 2

In quantitative fit testing, which method uses a particle counter to measure aerosol penetration through a respirator?

Accepted Answer

PortaCount test

Answer

The PortaCount uses condensation particle counting to quantitatively measure how many ambient particles penetrate the respirator seal.

Question 3

Which chemical form presents the greatest inhalation hazard for a substance with a very low vapor pressure at room temperature?

Accepted Answer

Aerosol/mist

Answer

When a low-vapor-pressure liquid is dispersed as an aerosol or mist, fine droplets remain airborne and can be inhaled deeply.

Question 4

Under the OSHA Respiratory Protection Standard (29 CFR 1910.134), how often must employees who wear tight-fitting respirators be fit tested?

Accepted Answer

Annually

Answer

OSHA requires annual fit testing for tight-fitting respirators to account for changes in facial structure and respirator condition.

Question 5

What is the primary purpose of biological monitoring in occupational health?

Accepted Answer

To assess total worker exposure from all routes including skin and ingestion

Answer

Biological monitoring measures biomarkers in blood, urine, or exhaled air to capture total body burden from all exposure routes.

CIH - Certified Industrial Hygienist Exam Practice Test