RSS Industrial Hygiene 3

Question 1

In the hierarchy of controls, which measure is most preferred for eliminating industrial hygiene hazards?

Accepted Answer

Elimination of the hazard

Answer

Engineering controls

Answer

Administrative controls

Answer

Personal protective equipment

Question 2

Substitution as an industrial hygiene control measure involves:

Accepted Answer

Replacing a hazardous material or process with a less hazardous alternative

Answer

Installing engineering barriers around the hazardous process

Answer

Rotating workers to limit each individual's exposure duration

Answer

Physically separating workers from hazardous areas administratively

Question 3

The recommended face velocity for a laboratory chemical fume hood is typically:

Accepted Answer

80–100 feet per minute (fpm)

Answer

25–40 feet per minute (fpm)

Answer

150–175 feet per minute (fpm)

Answer

250–300 feet per minute (fpm)

Question 4

Under OSHA 29 CFR 1910.95, a baseline audiogram must be established within how many months of an employee's first exposure at or above the noise action level?

Accepted Answer

6 months

Answer

3 months

Answer

12 months

Answer

18 months

Question 5

In ventilation system design, 'make-up air' refers to:

Accepted Answer

Air supplied to replace air exhausted from the space

Answer

Scented air added for worker comfort and morale

Answer

Emergency backup air supplied during power failures

Answer

Filtered air recirculated within a closed workspace

Question 6

OSHA defines a Standard Threshold Shift (STS) in audiometric testing as:

Accepted Answer

An average 10 dB change at 2000, 3000, and 4000 Hz in either ear

Answer

A 5 dB change at 500, 1000, or 2000 Hz in either ear

Answer

A 15 dB change at any single test frequency in either ear

Answer

A 25 dB change averaged across all test frequencies

Question 7

Safety Data Sheet (SDS) Section 8 is titled 'Exposure Controls/Personal Protection' and primarily provides:

Accepted Answer

Occupational exposure limits and recommended engineering controls

Answer

First aid measures and emergency response procedures

Answer

Physical and chemical properties of the substance

Answer

Ecological information and environmental disposal guidance