Question 1

What is the OSHA permissible exposure limit (PEL) for noise in construction over an 8-hour time-weighted average?

Accepted Answer

The OSHA permissible exposure limit (PEL) for noise in construction is 90 dBA over an 8-hour time-weighted average (TWA). Exposure above this level requires the employer to implement feasible engineering or administrative controls and provide hearing protection.

Question 2

At what noise exposure level must employers implement a hearing conservation program in construction?

Accepted Answer

The action level for noise exposure is 85 dBA as an 8-hour TWA. At this level, employers must implement a hearing conservation program that includes monitoring, audiometric testing, hearing protectors, training, and recordkeeping.

Question 3

What is the primary route of entry for silica dust into the body on a construction site?

Accepted Answer

Inhalation is the primary route of entry for respirable crystalline silica dust. When workers cut, grind, drill, or crush materials like concrete, stone, or brick, fine silica particles become airborne and can be breathed deep into the lungs, potentially causing silicosis.

Question 4

What disease is caused by prolonged exposure to respirable crystalline silica?

Accepted Answer

Silicosis is an irreversible lung disease caused by inhaling respirable crystalline silica dust. It causes scarring and inflammation of the lung tissue, reducing the ability to breathe. Silicosis can be acute, accelerated, or chronic depending on the level and duration of exposure.

Question 5

What is the OSHA permissible exposure limit (PEL) for respirable crystalline silica in construction?

Accepted Answer

The OSHA PEL for respirable crystalline silica in construction is 50 micrograms per cubic meter of air (50 ug/m3) as an 8-hour time-weighted average. The action level is 25 ug/m3.

Question 6

What is the most common health effect associated with prolonged exposure to lead in construction?

Accepted Answer

Lead exposure in construction can cause serious health effects including damage to the nervous system, kidneys, reproductive system, and blood-forming organs. Workers can be exposed during activities such as demolition, renovation, abrasive blasting, and cutting/welding lead-painted surfaces.

Question 7

What mineral, commonly found in older buildings and insulation, can cause mesothelioma and lung cancer when fibers are inhaled?

Accepted Answer

Asbestos is a naturally occurring mineral fiber that was widely used in construction materials for insulation, fireproofing, and reinforcement. When disturbed, asbestos fibers become airborne and can cause mesothelioma, lung cancer, and asbestosis when inhaled.

Question 8

What are the four main routes of entry for hazardous substances into the human body?

Accepted Answer

The four main routes of entry for hazardous substances are inhalation (breathing), absorption (through skin or eyes), ingestion (swallowing), and injection (through puncture wounds). Inhalation is the most common route of entry in construction.

Question 9

What is the purpose of a permissible exposure limit (PEL)?

Accepted Answer

A permissible exposure limit (PEL) is a legal limit established by OSHA for the maximum concentration of a hazardous substance (chemical or physical agent) that a worker may be exposed to, typically expressed as an 8-hour time-weighted average.

Question 10

What is the primary symptom of heat stroke that differentiates it from heat exhaustion?

Accepted Answer

Heat stroke is distinguished from heat exhaustion by altered mental status (confusion, slurred speech, loss of consciousness) and a dangerously high body temperature typically above 104°F. The skin may be hot and dry or damp. Heat stroke is a medical emergency requiring immediate action.

Question 11

Table 1 of the OSHA silica standard for construction provides which of the following?

Accepted Answer

Table 1 of 29 CFR 1926.1153 lists common construction tasks involving silica exposure and specifies the engineering controls, work practices, and respiratory protection required for each task. Employers who fully implement Table 1 controls are not required to measure silica exposure.

Question 12

What is the OSHA action level for airborne lead exposure in the construction industry?

Accepted Answer

The OSHA action level for lead in construction is 30 micrograms per cubic meter of air (30 ug/m3) averaged over an 8-hour period. At or above this level, employers must provide medical surveillance, biological monitoring, and other protective measures.

Question 13

Biological monitoring for lead exposure in construction workers involves measuring lead levels in which of the following?

Accepted Answer

Biological monitoring for lead exposure involves measuring the blood lead level (BLL). OSHA requires medical removal of construction workers whose BLL reaches 50 ug/dL or higher. Workers must not return until their BLL drops below 40 ug/dL.

Question 14

What type of asbestos work requires a competent person but does NOT require a negative-exposure assessment in construction?

Accepted Answer

Class IV asbestos work involves maintenance and custodial activities where employees contact but do not disturb asbestos-containing materials. It is the lowest risk class and does not require a negative-exposure assessment, though a competent person must supervise the work.

Question 15

Under the OSHA noise standard, when noise levels reach 90 dBA TWA and engineering controls are not feasible, what must the employer provide?

Accepted Answer

When noise exposure reaches or exceeds the PEL of 90 dBA TWA and feasible engineering and administrative controls do not reduce the exposure below the PEL, the employer must provide hearing protection devices to affected employees at no cost.

Question 16

Carbon monoxide (CO) exposure is most commonly associated with which construction activity?

Accepted Answer

Carbon monoxide is a colorless, odorless gas produced by incomplete combustion of fossil fuels. Construction workers are most at risk when operating gasoline-powered tools, generators, or vehicles in enclosed or poorly ventilated areas. CO can cause headaches, dizziness, and death at high concentrations.

Question 17

What is the OSHA PEL for carbon monoxide (CO) as an 8-hour TWA?

Accepted Answer

The OSHA permissible exposure limit (PEL) for carbon monoxide is 50 parts per million (ppm) as an 8-hour time-weighted average. This limit is set to protect workers from the harmful effects of CO including headaches, impaired judgment, and in severe cases, death.

Question 18

Bloodborne pathogen exposure in construction is most likely to occur during which activity?

Accepted Answer

Construction workers are most likely to encounter bloodborne pathogens when providing first aid to injured coworkers. Contact with blood or other potentially infectious materials through open wounds, mucous membranes, or needlestick injuries can transmit diseases like HIV, Hepatitis B, and Hepatitis C.

Question 19

What is the science of fitting workplace conditions to the capabilities of workers called?

Accepted Answer

Ergonomics is the science of designing the workplace, equipment, and tasks to fit the worker's physical capabilities and limitations. In construction, ergonomic hazards include repetitive motions, heavy lifting, awkward postures, and vibration, which can lead to musculoskeletal disorders.

Question 20

The practice of anticipating, recognizing, evaluating, and controlling workplace health hazards is known as:

Accepted Answer

Industrial hygiene is the discipline of anticipating, recognizing, evaluating, and controlling environmental factors or stresses arising in or from the workplace that may cause sickness, impaired health, or significant discomfort among workers. It forms the foundation of occupational health protection.

Question 21

Under the OSHA lead standard for construction, medical surveillance must be provided for workers exposed above the action level for how many consecutive days?

Accepted Answer

Employers must provide initial medical surveillance (including blood lead level testing) to employees exposed to airborne lead at or above the action level of 30 ug/m3 for more than 30 days per year. This surveillance helps detect elevated blood lead levels before symptoms develop.

Question 22

Under the OSHA silica rule, an employer using Table 1 must fully and properly implement all control measures listed for a specific task. If the employer cannot fully implement Table 1, what alternative compliance method must be used?

Accepted Answer

If an employer cannot fully implement Table 1 controls, they must use the alternative performance option under 29 CFR 1926.1153(d). This requires conducting exposure assessments through air monitoring, implementing controls to reduce exposure to or below the PEL, and using respiratory protection where the PEL cannot be met.

Question 23

What blood lead level (BLL) triggers mandatory medical removal of a construction worker from lead exposure?

Accepted Answer

Under the OSHA lead standard for construction, a worker must be medically removed from lead exposure when their blood lead level reaches 50 ug/dL or higher. The worker cannot return to lead work until their blood lead level drops below 40 ug/dL on two consecutive tests.

Question 24

Under the respirable crystalline silica standard, medical surveillance must be offered to workers exposed at or above the action level of 25 ug/m3 for how many days per year?

Accepted Answer

Employers must make medical surveillance available at no cost to employees who are or will be exposed at or above the action level of 25 ug/m3 for 30 or more days per year. The initial exam must be offered within 30 days of initial assignment and then every 3 years.

Question 25

Which class of asbestos work in construction involves the removal of thermal system insulation and surfacing materials?

Accepted Answer

Class I asbestos work is the highest risk classification and involves the removal of thermal system insulation (TSI) and surfacing asbestos-containing materials (ACM). It requires the most stringent controls including negative-pressure enclosures, decontamination procedures, and worker medical surveillance.

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