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OSHA construction health hazards practice questions

20 free practice questions from 29 CFR 1926 Subpart D. Each answer is explained and linked to the rule it comes from.

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OSHA Health hazards

20 questions across 8 topics. After each answer you see why it is right, with a link to the official source.

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Medical services and first aid

  1. 1. Under 1926.50(a), the employer must insure the availability of medical personnel for what purpose?

    • A. Inspecting scaffolds before each shift
    • B. Signing each employee's weekly timesheet
    • C. Advice and consultation on matters of occupational health
    • D. Approving the project's budget
    Show answer

    Answer: C. Advice and consultation on matters of occupational health

    "The employer shall insure the availability of medical personnel for advice and consultation on matters of occupational health."

    Source: eCFR: 29 CFR 1926.50, Medical services and first aid (as of Nov 3, 2026)

  2. 2. Under 1926.50(d)(2), how must the contents of the first aid kit be packaged?

    • A. In a locked metal cabinet in the site office
    • B. In any box marked with a red cross
    • C. In a weatherproof container with individual sealed packages for each type of item
    • D. In the glove box of a supervisor's vehicle
    Show answer

    Answer: C. In a weatherproof container with individual sealed packages for each type of item

    "The contents of the first aid kit shall be placed in a weatherproof container with individual sealed packages for each type of item".

    Source: eCFR: 29 CFR 1926.50, Medical services and first aid (as of Nov 3, 2026)

  3. 3. When must provisions be made for prompt medical attention in case of serious injury?

    • A. Prior to commencement of the project
    • B. When the project is half complete
    • C. Within 24 hours after the first serious injury
    • D. Only if the project lasts longer than 90 days
    Show answer

    Answer: A. Prior to commencement of the project

    "Provisions shall be made prior to commencement of the project for prompt medical attention in case of serious injury."

    Source: eCFR: 29 CFR 1926.50, Medical services and first aid (as of Nov 3, 2026)

  4. 4. In areas where 911 emergency dispatch services are not available, what must be conspicuously posted?

    • A. The OSHA area office address
    • B. The employer's insurance policy number
    • C. The list of first aid kit contents
    • D. The telephone numbers of the physicians, hospitals, or ambulances
    Show answer

    Answer: D. The telephone numbers of the physicians, hospitals, or ambulances

    "In areas where 911 emergency dispatch services are not available, the telephone numbers of the physicians, hospitals, or ambulances shall be conspicuously posted."

    Source: eCFR: 29 CFR 1926.50, Medical services and first aid (as of Nov 3, 2026)

  5. 5. 911 service is available, and the employer contacts emergency medical service with a communication system that does not automatically give the dispatcher the caller's latitude and longitude. What must be posted conspicuously at the worksite?

    • A. The telephone number of the OSHA area office
    • B. The employer's federal tax identification number
    • C. The latitude and longitude of the worksite, or other location-identification information that communicates effectively to employees the location of the worksite
    • D. Nothing, because 911 is available
    Show answer

    Answer: C. The latitude and longitude of the worksite, or other location-identification information that communicates effectively to employees the location of the worksite

    The employer must post in a conspicuous location at the worksite either "The latitude and longitude of the worksite" or "Other location-identification information that communicates effectively to employees the location of the worksite."

    Source: eCFR: 29 CFR 1926.50, Medical services and first aid (as of Nov 3, 2026)

Sanitation

  1. 6. To whom do the toilet requirements of 1926.51(c) not apply?

    • A. Mobile crews having transportation readily available to nearby toilet facilities
    • B. Crews of 20 or fewer employees
    • C. Projects shorter than 30 days
    • D. Crews that work outdoors
    Show answer

    Answer: A. Mobile crews having transportation readily available to nearby toilet facilities

    The requirements of paragraph (c) for sanitation facilities "shall not apply to mobile crews having transportation readily available to nearby toilet facilities."

    Source: eCFR: 29 CFR 1926.51, Sanitation (as of Nov 3, 2026)

  2. 7. How must outlets for nonpotable water, such as water for industrial or firefighting purposes only, be identified under 1926.51(b)?

    • A. With blue paint on the pipe
    • B. With a padlock on the tap
    • C. With a red tap handle
    • D. By signs that indicate clearly the water is unsafe and is not to be used for drinking, washing, or cooking
    Show answer

    Answer: D. By signs that indicate clearly the water is unsafe and is not to be used for drinking, washing, or cooking

    Such outlets "shall be identified by signs meeting the requirements of subpart G of this part, to indicate clearly that the water is unsafe and is not to be used for drinking, washing, or cooking purposes."

    Source: eCFR: 29 CFR 1926.51, Sanitation (as of Nov 3, 2026)

  3. 8. Where showers are required by a particular standard, how many showers must be provided?

    • A. One for each 10 employees of each sex, or numerical fraction thereof, who are required to shower during the same shift
    • B. One for each 40 employees
    • C. One for each 25 employees of each sex
    • D. One per jobsite
    Show answer

    Answer: A. One for each 10 employees of each sex, or numerical fraction thereof, who are required to shower during the same shift

    "One shower shall be provided for each 10 employees of each sex, or numerical fraction thereof, who are required to shower during the same shift."

    Source: eCFR: 29 CFR 1926.51, Sanitation (as of Nov 3, 2026)

Air contaminants and ventilation

  1. 9. Under 1926.57(b), local exhaust systems must be designed so that dusts, fumes, mists, vapors or gases are handled in what way?

    • A. They are blown toward the nearest open window
    • B. They are not drawn through the work area of employees
    • C. They are drawn past the employees' breathing zone first
    • D. They are collected only at the end of each shift
    Show answer

    Answer: B. They are not drawn through the work area of employees

    Local exhaust systems "shall be so designed that dusts, fumes, mists, vapors, or gases are not drawn through the work area of employees."

    Source: eCFR: 29 CFR 1926.57, Ventilation (as of Nov 3, 2026)

  2. 10. Under 1926.55(b), equipment and technical measures used to keep exposure to air contaminants within the limits must first be approved for each particular use by whom?

    • A. The equipment's sales representative
    • B. A competent industrial hygienist or other technically qualified person
    • C. Any employee on the crew
    • D. The local fire marshal
    Show answer

    Answer: B. A competent industrial hygienist or other technically qualified person

    "Any equipment and technical measures used for this purpose must first be approved for each particular use by a competent industrial hygienist or other technically qualified person."

    Source: eCFR: 29 CFR 1926.55, Gases, vapors, fumes, dusts, and mists (as of Nov 3, 2026)

Noise

  1. 11. Under 1926.52(c), how is noise treated when its variations in level involve maxima at intervals of 1 second or less?

    • A. As impact noise limited to 140 dB
    • B. As noise measured on the C-scale
    • C. As noise that is not counted
    • D. As continuous noise
    Show answer

    Answer: D. As continuous noise

    "If the variations in noise level involve maxima at intervals of 1 second or less, it is to be considered continuous."

    Source: eCFR: 29 CFR 1926.52, Occupational noise exposure (as of Nov 3, 2026)

  2. 12. An employee's daily noise exposure is made up of periods at different levels, so the equivalent noise exposure factor Fe is computed. When does the exposure exceed permissible levels?

    • A. When Fe equals one half
    • B. When Fe exceeds unity (1)
    • C. When Fe is less than 1
    • D. Only when one period is above 115 dBA
    Show answer

    Answer: B. When Fe exceeds unity (1)

    Fe is the sum of each period at a constant level divided by the permissible duration at that level, and "If the value of Fe exceeds unity (1) the exposure exceeds permissible levels."

    Source: eCFR: 29 CFR 1926.52, Occupational noise exposure (as of Nov 3, 2026)

  3. 13. Under 1926.52(d)(1), what must be administered in all cases where the sound levels exceed the values shown in Table D-2?

    • A. A one-time hearing test at hire only
    • B. A continuing, effective hearing conservation program
    • C. A monthly noise survey by OSHA
    • D. A written warning to each exposed employee
    Show answer

    Answer: B. A continuing, effective hearing conservation program

    "In all cases where the sound levels exceed the values shown herein, a continuing, effective hearing conservation program shall be administered."

    Source: eCFR: 29 CFR 1926.52, Occupational noise exposure (as of Nov 3, 2026)

Hazard communication

  1. 14. Section 1926.59 makes 1910.1200 the hazard communication rule for construction. Which of these is on the 1910.1200(b)(6) list of things outside the standard's coverage?

    • A. Hazardous chemicals a subcontractor stores on site
    • B. Wood that may be sawed or cut later, generating dust
    • C. Chemicals contained in unlabeled pipes in work areas
    • D. Tobacco or tobacco products
    Show answer

    Answer: D. Tobacco or tobacco products

    The construction requirements "are identical to those set forth at § 1910.1200 of this chapter", and 1910.1200 does not apply to "Tobacco or tobacco products". Wood "which may be subsequently sawed or cut, generating dust" is expressly not exempted.

    Source: eCFR: 29 CFR 1910.1200, Hazard communication (as of Nov 3, 2026)

Lead

  1. 15. On what terms does 1926.62(j)(1)(iv) require the employer to make the lead medical surveillance, including multiple physician review, available?

    • A. With the cost shared equally by the employer and the employee
    • B. Without cost to employees and at a reasonable time and place
    • C. Only outside the employee's working hours, at the employee's expense
    • D. Only after the employee signs a waiver of medical removal protection
    Show answer

    Answer: B. Without cost to employees and at a reasonable time and place

    The employer "shall make available the required medical surveillance including multiple physician review under paragraph (j)(3)(iii) without cost to employees and at a reasonable time and place."

    Source: eCFR: 29 CFR 1926.62, Lead (as of Nov 3, 2026)

  2. 16. Respirators are used to limit employee exposure to lead, and all the requirements of 1926.62(e)(1) and (f) have been met. Under 1926.62(c)(3), how may employee exposure be considered for the periods the respirator is worn?

    • A. As zero for the whole shift, whatever respirator is used
    • B. At double the measured airborne level
    • C. At the level provided by the protection factor of the respirator
    • D. At half the PEL, whatever respirator is used
    Show answer

    Answer: C. At the level provided by the protection factor of the respirator

    In that case "employee exposure may be considered to be at the level provided by the protection factor of the respirator for those periods the respirator is worn." Those periods "may be averaged with exposure levels during periods when respirators are not worn to determine the employee's daily TWA exposure."

    Source: eCFR: 29 CFR 1926.62, Lead (as of Nov 3, 2026)

  3. 17. An employee wears a respirator while working with lead. When the employer judges whether that employee's exposure is at or above the 1926.62 action level, how is the respirator treated?

    • A. The exposure is judged without regard to the use of respirators
    • B. The action level is raised to 50 µg/m3 for respirator wearers
    • C. The action level applies only to employees who do not wear respirators
    • D. The respirator brings the exposure under the action level, whatever the airborne level
    Show answer

    Answer: A. The exposure is judged without regard to the use of respirators

    Action level means employee exposure, "without regard to the use of respirators, to an airborne concentration of lead of 30 micrograms per cubic meter of air (30 µg/m3) calculated as an 8-hour time-weighted average (TWA)."

    Source: eCFR: 29 CFR 1926.62, Lead (as of Nov 3, 2026)

Lasers and microwaves (nonionizing radiation)

  1. 18. What does 1926.54(h) require for laser systems when it is raining or snowing, or when there is dust or fog in the air?

    • A. They may be run at higher power to cut through the weather
    • B. Only the beam shutter needs to be closed between uses
    • C. Nothing, because weather does not affect lasers
    • D. Their operation is prohibited where practicable, and employees are kept out of range of the area of source and target
    Show answer

    Answer: D. Their operation is prohibited where practicable, and employees are kept out of range of the area of source and target

    In those conditions "the operation of laser systems shall be prohibited where practicable; in any event, employees shall be kept out of range of the area of source and target during such weather conditions."

    Source: eCFR: 29 CFR 1926.54, Nonionizing radiation (as of Nov 3, 2026)

  2. 19. What must be done when a laser is left unattended for a substantial period of time, such as during lunch hour or overnight?

    • A. Point it at the ground
    • B. Cover it with a tarp
    • C. Turn the laser off
    • D. Post a second warning placard
    Show answer

    Answer: C. Turn the laser off

    "When the laser is left unattended for a substantial period of time, such as during lunch hour, overnight, or at change of shifts, the laser shall be turned off."

    Source: eCFR: 29 CFR 1926.54, Nonionizing radiation (as of Nov 3, 2026)

Illumination

  1. 20. For areas or operations not covered by Table D-3, where does 1926.56(b) refer the employer for recommended illumination values?

    • A. American National Standard A11.1-1965, R1970, Practice for Industrial Lighting
    • B. ANSI/ISEA Z87.1-2010
    • C. ANSI Z89.1-2009
    • D. ANSI Z41.1-1967
    Show answer

    Answer: A. American National Standard A11.1-1965, R1970, Practice for Industrial Lighting

    For areas or operations not covered above, "refer to the American National Standard A11.1-1965, R1970, Practice for Industrial Lighting, for recommended values of illumination."

    Source: eCFR: 29 CFR 1926.56, Illumination (as of Nov 3, 2026)