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Free OHST Practice Questions

10 free, exam-style Occupational Hygiene and Safety Technician (OHST) practice questions with answers and explanations. No signup required. Work through them below, then take the full free OHST practice test to study every exam domain.

Question 1

A facility employs 250 workers who logged 500,000 hours during the year and recorded 8 OSHA-recordable injuries. What is the facility's Total Recordable Incident Rate (TRIR)?

  1. 3.2
  2. 2.4
  3. 1.6
  4. 6.4
Show answer & explanation

Correct answer: A - 3.2

Question 2

A safety technician identifies a workplace noise exposure averaging 95 dBA. According to the NIOSH/ANSI/ASSP Z10 hierarchy of controls, which approach should be considered FIRST?

  1. Issue hearing protection devices
  2. Install engineering enclosures
  3. Eliminate the noise source
  4. Implement job-rotation schedules
Show answer & explanation

Correct answer: C - Eliminate the noise source

Question 3

An OHST walking through a facility observes a worker climbing into an open chemical storage tank without atmospheric testing or a permit. The first action the OHST should take is to:

  1. Document the observation for the next audit
  2. Discuss the violation with the worker after the shift
  3. Stop the entry immediately
  4. File a written report with management later
Show answer & explanation

Correct answer: C - Stop the entry immediately

Question 4

Under OSHA's personal fall arrest system requirements (29 CFR 1926.502), the maximum free-fall distance allowed before the system begins arresting the fall is:

  1. 3 feet maximum
  2. 6 feet maximum
  3. 10 feet maximum
  4. 15 feet maximum
Show answer & explanation

Correct answer: B - 6 feet maximum

Question 5

A rigging crew lifts a 4,000 lb load using a two-leg sling configuration with each leg at 60° from horizontal. What percentage of the rated single-leg capacity does each leg actually carry?

  1. 50% of rated capacity
  2. 87% of rated capacity
  3. 71% of rated capacity
  4. 100% of rated capacity
Show answer & explanation

Correct answer: B - 87% of rated capacity

Question 6

An industrial hygienist needs to determine the highest airborne concentration in which a respirator can be safely used. The Maximum Use Concentration (MUC) is calculated as:

  1. APF × PEL
  2. APF + PEL
  3. APF − PEL
  4. APF ÷ PEL
Show answer & explanation

Correct answer: A - APF × PEL

Question 7

A worker is selected to use a tight-fitting full-facepiece Powered Air-Purifying Respirator (PAPR) with manufacturer evidence supporting an OSHA-recognized protection level. The Assigned Protection Factor (APF) is:

  1. 50
  2. 100
  3. 10,000
  4. 1,000
Show answer & explanation

Correct answer: D - 1,000

Question 8

ANSI Z358.1 requires that emergency eyewash stations be reachable by an exposed worker within what distance and time?

  1. 10 seconds and 55 feet
  2. 30 seconds and 100 feet
  3. 1 minute and 200 feet
  4. 2 minutes and 500 feet
Show answer & explanation

Correct answer: A - 10 seconds and 55 feet

Question 9

A workplace fatality occurs at 6:00 PM on a Friday. Per 29 CFR 1904.39, the employer must report the fatality to OSHA within how many hours?

  1. 1 hour
  2. 8 hours
  3. 24 hours
  4. 7 days
Show answer & explanation

Correct answer: B - 8 hours

Question 10

An OHST is asked to recommend personal protective equipment for their employer and learns they hold significant stock in one of the candidate vendors. Per the BCSP Code of Ethics, the OHST should:

  1. Avoid mentioning the financial interest
  2. Disclose the conflict to the employer
  3. Recommend only that vendor's products
  4. Decline to participate without explanation
Show answer & explanation

Correct answer: B - Disclose the conflict to the employer

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