HSE Occupational Health and Industrial Hygiene 2

Question 1

Which OSHA permissible exposure limit (PEL) type represents the maximum concentration a worker can be exposed to for any 15-minute period?

Accepted Answer

Short-term exposure limit (STEL)

Answer

Time-weighted average (TWA)

Answer

Ceiling value (C)

Answer

Action level (AL)

Question 2

A worker is exposed to a noise level of 95 dBA for 4 hours per day. According to OSHA's permissible noise standard, what is the maximum additional hours of exposure at 90 dBA allowed?

Accepted Answer

2 hours

Answer

4 hours

Answer

1 hour

Answer

0 hours — dose is already exceeded

Question 3

What term describes the process of drawing a contaminant-containing air sample through a collection medium at a known flow rate to measure worker exposure?

Accepted Answer

Active sampling

Answer

Passive sampling

Answer

Grab sampling

Answer

Wipe sampling

Question 4

Which biological monitoring marker is most appropriate for assessing recent benzene exposure in a worker?

Accepted Answer

Urinary trans,trans-muconic acid

Answer

Blood lead level

Answer

Urinary mandelic acid

Answer

Exhaled carbon monoxide

Question 5

According to the hierarchy of controls, which measure most effectively eliminates an occupational health hazard?

Accepted Answer

Substitution of the hazardous substance

Answer

Engineering controls

Answer

Administrative controls

Answer

Personal protective equipment

Question 6

A gas with a vapor density greater than 1.0 tends to accumulate in which location within an enclosed space?

Accepted Answer

Low-lying areas and floor level

Answer

Near the ceiling

Answer

Uniformly throughout the space

Answer

Near air intake vents

Question 7

Which type of ventilation system dilutes contaminated workplace air with fresh air rather than capturing contaminants at their source?

Accepted Answer

General dilution ventilation

Answer

Local exhaust ventilation

Answer

Make-up air system

Answer

Recirculation ventilation