Free Certified Industrial Hygienist (CIH) MCQ Questions and Answers — Questions and Answers
Question 1: The beta, gamma, and x-rays are measured with this instrument:
- Dosimeters
- Radmeters
- Geiger-Muller (Correct answer)
- Geigle-Mueller
Correct answer: Geiger-Muller
The Geiger-Muller counter, commonly known as a Geiger counter, is a standard instrument used for detecting and measuring ionizing radiation. It is particularly effective at identifying the presence of beta particles, gamma rays, and x-rays. The instrument works by detecting the ionization events caused by these types of radiation within a gas-filled tube.
Question 2: A radiation accumulation measurement film badge is known as a:
- Dosimeters (Correct answer)
- Radmeter
- Geiger-Muller
- Geigle-Mueller
Correct answer: Dosimeters
A dosimeter is a device specifically designed to measure an individual's accumulated dose of ionizing radiation over a period. Film badges are a common type of passive dosimeter that contain photographic film, which darkens proportionally to the radiation exposure received. This provides a cumulative record of the radiation dose absorbed by the wearer.
Question 3: Which of the following methods for reducing or removing exposure to occupational health risks is most effective?
- Personal Protective Equipment
- Inspections and audits
- Engineering controls
- Administrative controls (Correct answer)
Correct answer: Administrative controls
Administrative controls involve implementing policies, procedures, and work practices that reduce exposure to hazards, such as limiting time in hazardous areas, job rotation, or developing safe work procedures. These controls directly manage how workers interact with the hazard, effectively minimizing exposure duration or intensity. In many scenarios, especially when engineering controls are not fully feasible or sufficient, well-designed administrative controls can be the most practical and effective means to significantly reduce or remove occupational health risks.
Question 4: Paper cannot be penetrated by this radiation because it is so faint.
- neutrons
- gamma-rays
- beta-radiation
- alpha-particles (Correct answer)
Correct answer: alpha-particles
Alpha particles are the least penetrating type of ionizing radiation due to their relatively large mass and charge. They consist of two protons and two neutrons, causing them to interact readily with matter and lose energy quickly. Consequently, alpha particles can be effectively stopped by a simple sheet of paper, the outer layer of human skin, or even a few centimeters of air.
Question 5: Which two consequences can be arbitrarily separated from a substance's action?
- minor and major
- expected and unexpected
- lethal and nonlethal
- acute and chronic (Correct answer)
Correct answer: acute and chronic
The consequences of exposure to a substance can be broadly categorized into acute and chronic effects. Acute effects manifest rapidly after a short-term, often high-level exposure, while chronic effects develop slowly over a prolonged period due to repeated or long-term exposure, typically at lower levels. These two classifications help differentiate the onset and duration of health impacts from occupational exposures.
Question 6: Non-ionizing radiation's detrimental effects on the body are mostly determined by:
- variation
- intensity
- duration
- frequency (Correct answer)
Correct answer: frequency
The detrimental effects of non-ionizing radiation on the body are primarily determined by its frequency, intensity, and duration of exposure. Frequency is a critical factor because it dictates the energy of the photons and how they interact with biological tissues. Different frequencies of non-ionizing radiation (e.g., radiofrequency, microwave, UV) lead to distinct mechanisms of energy absorption and subsequent biological effects.
Question 7: It is very useful to substitute or replace harmful materials with innocuous ones.
- administrative control
- technical control
- industrial control
- engineering control (Correct answer)
Correct answer: engineering control
Substituting or replacing harmful materials with less hazardous or innocuous alternatives is a highly effective engineering control. Engineering controls are designed to eliminate or reduce hazards at the source by modifying the work environment or process itself. This method is high on the hierarchy of controls because it inherently reduces risk without relying on individual worker behavior or personal protective equipment.
Question 8: This undetectable low frequency radiation is used in diathermy, radar, communications, and cooking.
- infrared
- laser
- microwave (Correct answer)
- ultraviolet
Correct answer: microwave
Microwave radiation is a form of non-ionizing electromagnetic radiation characterized by its low frequency and invisibility to the human eye. It is widely utilized in various applications, including heating food in microwave ovens, radar systems for detection and navigation, communications technology, and medical diathermy for therapeutic heating of tissues. Its undetectable nature at low frequencies necessitates careful control in occupational settings.
Question 9: The skin's top layer is impermeable to this invisible low frequency radiation:
- infrared (Correct answer)
- laser
- microwave
- ultraviolet
Correct answer: infrared
Infrared (IR) radiation is a type of non-ionizing electromagnetic radiation that is primarily perceived as heat. It has longer wavelengths than visible light and is largely absorbed by the superficial layers of the skin. While intense IR exposure can cause burns, the skin's top layer acts as a barrier, preventing significant penetration into deeper tissues, thus making it impermeable to deeper effects.
Question 10: Around electric arcs, this type of radiation can be found, and it needs opaque shielding:
- infrared
- laser
- microwave
- ultraviolet (Correct answer)
Correct answer: ultraviolet
Ultraviolet (UV) radiation is commonly generated by electric arcs, such as those found in welding operations. This type of non-ionizing radiation carries sufficient energy to cause significant damage to skin and eyes, including burns and cataracts. Therefore, opaque shielding, like welding helmets and screens, is essential to block UV radiation and protect workers from its harmful effects.
Question 11: What kind of workplace risk does noise over 85 dB represent?
- Ergonomic hazard
- Biological hazard
- Physical hazard (Correct answer)
- Chemical hazard
Correct answer: Physical hazard
Noise, particularly at levels exceeding 85 dB, is categorized as a physical hazard in industrial hygiene. Physical hazards are environmental factors that can cause harm through physical mechanisms, distinct from chemical or biological interactions. Prolonged exposure to high noise levels can lead to permanent hearing loss, stress, and other adverse health effects, making it a critical concern for industrial hygienists.
Question 12: What occupations are most susceptible to biological hazards?
- Health workers
- Occupation related food processing and packing
- Occupations related to plants and animal
- All of the above (Correct answer)
Correct answer: All of the above
Biological hazards, such as bacteria, viruses, fungi, and parasites, can pose risks in a wide array of occupations. Health workers are exposed to pathogens from patients, food processing and packing workers can encounter foodborne contaminants, and individuals in occupations related to plants and animals (e.g., agriculture, veterinary medicine) are susceptible to zoonotic diseases. Therefore, all listed occupations face significant biological hazards.
Question 13: It is a science and practice known as _______ to continuously anticipate, recognize, analyze, and regulate occupational health hazards in order to reduce the risk of disease or harm to employees.
- Industrial Safety
- Process safety management
- Industrial hygiene (Correct answer)
- Hazard
Correct answer: Industrial hygiene
Industrial hygiene is the recognized science and practice dedicated to protecting worker health and well-being. It involves a systematic approach to anticipate, recognize, evaluate, and control environmental factors or stresses in the workplace that could lead to sickness, impaired health, or discomfort. This comprehensive definition aligns perfectly with the description provided.
Question 14: What workplace risks were found during the Industrial Hygiene monitoring/survey?
- Air contaminants
- Ergonomic and physical hazards
- Chemical exposure and biological exposure
- All of the above (Correct answer)
Correct answer: All of the above
Industrial hygiene monitoring and surveys are comprehensive processes designed to identify and assess a broad spectrum of potential workplace risks. This includes evaluating airborne contaminants (like gases, vapors, and dusts), assessing ergonomic stressors, identifying physical hazards (such as noise, radiation, and temperature extremes), and recognizing both chemical and biological exposures. Therefore, an effective survey covers all these categories to ensure a complete risk assessment.
Question 15: What are the dangers of workers being exposed to hazardous chemicals?
- Cancer
- Heart illnesses
- CNS damage
- All of the above (Correct answer)
Correct answer: All of the above
Exposure to hazardous chemicals in the workplace can lead to a diverse range of adverse health effects, depending on the specific chemical, dose, and duration of exposure. These potential consequences include serious chronic diseases like cancer, cardiovascular issues, and damage to vital organ systems such as the central nervous system (CNS). Therefore, all the listed health problems are potential dangers.
Question 16: What physical risks are acknowledged in industrial hygiene?
- Sulfuric acid
- Accumulated water
- Extreme temperature and extreme cold (Correct answer)
- Opening in surfaces or walkways
Correct answer: Extreme temperature and extreme cold
In industrial hygiene, physical risks encompass environmental factors that can cause harm through physical mechanisms. This category includes hazards like noise, vibration, radiation, and thermal extremes. Therefore, extreme temperature (both heat and cold) is a recognized physical hazard that industrial hygienists address to prevent conditions such as heat stress, cold stress, and related health issues.
Free Certified Industrial Hygienist (CIH) MCQ Questions and Answers
The beta, gamma, and x-rays are measured with this instrument: