OHST Industrial Hygiene & Exposure Assessment 2

Question 1

What type of air sampling is used to measure contaminant concentrations specifically in a worker's breathing zone?

Accepted Answer

Personal sampling

Answer

Area sampling

Answer

Grab sampling

Answer

Perimeter sampling

Question 2

A 'grab sample' in air monitoring is best described as:

Accepted Answer

A sample collected over a short, defined time period

Answer

A sample collected over an entire 8-hour work shift

Answer

A sample collected at a fixed location with no worker present

Answer

A sample taken at the boundary of the work area

Question 3

Which sampling media is most commonly used to collect organic vapors for subsequent laboratory analysis?

Accepted Answer

Activated charcoal tube

Answer

HEPA filter

Answer

Polyvinyl chloride (PVC) filter

Answer

Mixed cellulose ester filter

Question 4

Which instrument provides real-time, direct readings of airborne particulate concentrations without laboratory analysis?

Accepted Answer

Direct-reading photometer or optical particle counter

Answer

Midget impinger

Answer

Activated charcoal tube

Answer

Bubblers and impingers

Question 5

OSHA's action level for occupational noise exposure, which triggers hearing conservation program requirements, is:

Accepted Answer

85 dBA as an 8-hour TWA

Answer

80 dBA as an 8-hour TWA

Answer

90 dBA as an 8-hour TWA

Answer

95 dBA as an 8-hour TWA

Question 6

In biological monitoring, what is being measured to evaluate worker exposure?

Accepted Answer

Chemical substances or their metabolites in body fluids or tissues

Answer

Airborne concentration of hazardous substances near the worker

Answer

Surface contamination levels in the surrounding work area

Answer

Real-time noise levels recorded near the worker's ears

Question 7

A colorimetric detector tube works by:

Accepted Answer

Producing a visible color change in a reagent as the target gas passes through

Answer

Capturing particles on a filter for gravimetric weight analysis

Answer

Ionizing gas molecules for detection by an electronic sensor

Answer

Measuring the infrared absorption spectrum of the collected sample