Free Certified Industrial Hygienist Occupational Health Hazards Questions and Answers — Questions and Answers

Question 1: All of the following tactics—with the exception of—are used to control occupational health hazards:

Administrative controls
Personal Protective Equipment
Inspections and audits (Correct answer)
Engineering controls

Correct answer: Inspections and audits

The hierarchy of controls outlines the primary strategies for managing occupational health hazards: elimination/substitution, engineering controls, administrative controls, and personal protective equipment. Inspections and audits are essential tools for identifying hazards, monitoring compliance, and evaluating the effectiveness of controls, but they are not direct control *tactics* themselves in the same way the other options are.

Question 2: Which of the following methods for reducing or eliminating workplace health risks is most effective?

Personal Protective Equipment
Inspections and audits
Engineering controls (Correct answer)
Administrative controls

Correct answer: Engineering controls

Engineering controls are considered the most effective method in the hierarchy of controls because they eliminate or reduce the hazard at its source, often through physical changes to the workplace or process. This approach provides the highest level of protection as it does not rely on worker behavior or continuous management, unlike administrative controls or PPE.

Question 3: Which of the following approaches is regarded as the first line of defense for limiting workplace health risks?

Personal Protective Equipment
Inspections and audits
Engineering controls (Correct answer)
Administrative controls

Correct answer: Engineering controls

Engineering controls are positioned high in the hierarchy of controls, often considered the first line of defense after elimination/substitution. They aim to reduce or remove hazards by modifying the work environment or process itself, thereby making the workplace inherently safer. This proactive approach is preferred over relying on administrative procedures or personal protective equipment.

Question 4: Which approach might be required if it is not possible to make the workplace entirely safe?

Personal Protective Equipment (Correct answer)
Administrative controls
Inspections and audits
Engineering controls

Correct answer: Personal Protective Equipment

When engineering and administrative controls are not feasible or cannot fully eliminate a hazard, Personal Protective Equipment (PPE) serves as the last line of defense. PPE protects the individual worker from residual hazards that cannot be controlled by other means, acting as a barrier between the worker and the hazard.

Question 5: What discipline of science investigates a substance's toxicity or poisonousness?

Pharmacology
Virology
Toxicology (Correct answer)
Epidemiology

Correct answer: Toxicology

Toxicology is the scientific discipline dedicated to studying the adverse effects of chemical, physical, or biological agents on living organisms. This includes investigating a substance's toxicity or poisonousness, dose-response relationships, and mechanisms of action. The other disciplines listed focus on drug action, viruses, or disease patterns in populations.

Question 6: When exposure occurs via a method other than inhalation, the calculated dose of a drug that is anticipated to kill 50% of a specified experimental animal population is known as the:

Lethal Dose Ratio
Lethal Dose Limit
LD50 (Correct answer)
KR50

Correct answer: LD50

LD50 stands for 'Lethal Dose 50%' and is a standard measure of acute toxicity. It represents the dose of a substance that is expected to cause death in 50% of a test animal population when administered by a route other than inhalation. For inhalation, the term LC50 (Lethal Concentration 50%) is typically used.

Question 7: Which of the following organizations releases TLVs and PELs?

OSHA and MSHA
NIOSH and OSHA
ACGIH and MSHA
ACGIH and OSHA (Correct answer)

Correct answer: ACGIH and OSHA

The American Conference of Governmental Industrial Hygienists (ACGIH) publishes Threshold Limit Values (TLVs), which are recommended occupational exposure guidelines. The Occupational Safety and Health Administration (OSHA) sets Permissible Exposure Limits (PELs), which are legally enforceable standards in the United States. Both organizations are key in establishing these critical exposure limits.

Question 8: The following is the most often used laser safety standard in the US:

CFR 1904.1200
NIOSH Pub. 456
LIA/ANSI Z136.1 (Correct answer)
ACGIH 1910.95

Correct answer: LIA/ANSI Z136.1

The LIA/ANSI Z136.1 standard, 'Safe Use of Lasers,' developed by the Laser Institute of America (LIA) and approved by the American National Standards Institute (ANSI), is the most comprehensive and widely adopted laser safety standard in the United States. It provides detailed guidance for the safe design, use, and maintenance of lasers and laser systems.

Question 9: The signs of this illness include weakness, headaches, dizziness, weariness, and blurred vision.

heat stroke
heat stress
dehydration
heat exhaustion (Correct answer)

Correct answer: heat exhaustion

Heat exhaustion is a common heat-related illness characterized by symptoms such as weakness, headaches, dizziness, fatigue, and blurred vision, often accompanied by heavy sweating. It occurs when the body overheats and loses too much water and salt, but the body's temperature regulation system is still functioning. Heat stroke is a more severe condition involving a dangerously high body temperature and altered mental state.

Question 10: The ACGIH published this exposure guideline for airborne concentrations, known as the

Threshold Limit Value (TLV) (Correct answer)
Threshold Exposure Limit (TEL)
Permissible Exposure Limit (PEL)
Permissible Limit Value (PLV)

Correct answer: Threshold Limit Value (TLV)

The American Conference of Governmental Industrial Hygienists (ACGIH) is well-known for publishing the Threshold Limit Values (TLVs). These are recommended guidelines for airborne concentrations of chemical substances and physical agents to which nearly all workers may be repeatedly exposed day after day without adverse health effects. They are health-based recommendations, not legally enforceable standards.

Question 11: The time-weighted average concentration for the TLV-TWA is:

averaged 48-hour exposure
15-minute exposure
8-hour exposure (Correct answer)
averaged 24-hour exposure

Correct answer: 8-hour exposure

The TLV-TWA (Threshold Limit Value - Time-Weighted Average) is defined as the time-weighted average concentration for a normal 8-hour workday and a 40-hour workweek. This value represents the average exposure over this period that nearly all workers can be repeatedly exposed to without adverse health effects.

Question 12: Why do a lot of workplaces nowadays provide unusual occupational health risks?

Ever-increasing exposure to exotic substances
Jobs are moving overseas
A shift from manufacturing to service (Correct answer)
Downsizing

Correct answer: A shift from manufacturing to service

The shift from a manufacturing-heavy economy to a service-based economy has introduced new and often less obvious occupational health risks. While manufacturing had clear physical and chemical hazards, service industries present challenges like ergonomic issues, psychosocial stressors, indoor air quality problems, and exposure to different types of chemicals, making the health risks 'unusual' compared to traditional industrial settings.

Question 13: The maximum concentration of an airborne pollutant for a continuous 15-minute exposure is as follows:

TLV-MWD
TLV-C
TLV-STEL (Correct answer)
TLV-TWA

Correct answer: TLV-STEL

The TLV-STEL (Threshold Limit Value - Short-Term Exposure Limit) is defined as the maximum concentration to which workers can be exposed for a continuous period of up to 15 minutes. This limit is set to prevent irritation, chronic or irreversible tissue damage, or narcosis that could impair self-rescue or reduce work efficiency, with specific restrictions on frequency and duration of such exposures.

Question 14: The safety and health manager must first be familiar with the raw materials used and the nature of the finished goods in order to spot hazardous environmental conditions or stressors in the workplace. The safety expert would seek advice from:

NAIC Codes
TLV-STEL
MSDSs (Correct answer)
OSHA 300 Summary

Correct answer: MSDSs

Material Safety Data Sheets (MSDSs), now commonly referred to as Safety Data Sheets (SDSs), are comprehensive documents that provide detailed information about hazardous chemicals. They are the primary resource for a safety and health manager to identify the properties, hazards, safe handling procedures, and emergency measures associated with raw materials and finished goods in the workplace.

Question 15: Which of the following is not regarded as having an impact on the danger posed by exposure to a hazardous environment?

Duration of the exposure
Intensity of the exposure
Degree of probability of exposure (Correct answer)
Nature of the material or energy involved

Correct answer: Degree of probability of exposure

The danger posed by exposure to a hazardous environment is directly influenced by the nature of the hazardous material or energy, the intensity (concentration or level) of the exposure, and the duration of that exposure. The 'degree of probability of exposure' relates to the likelihood of exposure occurring, which is a factor in risk assessment, but not a direct determinant of the *danger* or *impact* once exposure has already taken place.

Question 16: The following factors are all crucial ones to take into account when sampling air, with the exception of:

number of samples taken
sampling location
proper time to sample
sequence of sampling (Correct answer)

Correct answer: sequence of sampling

Effective air sampling requires careful consideration of the number of samples needed for statistical validity, the specific sampling location to accurately represent worker exposure, and the proper time to sample (e.g., during peak activities or for a full shift). The 'sequence of sampling,' or the order in which individual samples are collected, generally does not impact the overall validity or representativeness of the air sampling results, as long as the other critical factors are met.

Free Certified Industrial Hygienist Occupational Health Hazards Questions and Answers

All of the following tactics—with the exception of—are used to control occupational health hazards: