CAOHC Occupational Hearing Conservation Practice Test PDF (Free Printable 2026)
Pass the CAOHC Occupational Hearing Conservation exam with confidence. Practice questions with detailed explanations and instant feedback on every answer.
CAOHC Practice Test PDF – Study Offline for the OHC Certification Exam
The CAOHC certification exam assesses your knowledge of occupational hearing conservation principles and OSHA's Hearing Conservation Standard (29 CFR 1910.95). Whether you're preparing to become an Occupational Hearing Conservationist (OHC) or a Certified Occupational Hearing Conservation Supervisor (COHC), having a printable PDF study resource lets you review key concepts anywhere — no internet required.
Our free CAOHC practice test PDF covers the core domains tested on the certification exam: noise measurement, audiometric testing procedures, standard threshold shift interpretation, hearing protection device selection, and employee training requirements. Download it below and pair it with our full CAOHC practice test online for the most complete preparation.
What the CAOHC Exam Covers
The CAOHC certification exam is based on the curriculum delivered in approved training courses. You'll need a solid understanding of every major domain before sitting the exam.
Noise Exposure Assessment
You must understand how to use dosimeters and sound level meters to measure occupational noise. Key concepts include the decibel (dB) scale, A-weighting (dBA), time-weighted average (TWA) calculation, and the 5 dB OSHA exchange rate (doubling the dose for every 5 dB increase). Noise dose percentages and action vs. permissible exposure levels must be committed to memory.
Audiometric Testing Program
OSHA 29 CFR 1910.95 requires employers to establish an audiometric testing program for workers exposed at or above the 85 dBA action level. Exam content covers baseline and annual audiogram requirements, audiometer types (pure-tone air conduction), calibration schedules (acoustic calibration daily, exhaustive annually), qualified technician requirements, and quiet testing environment standards.
Audiogram Interpretation and STS
Candidates must interpret audiograms and identify Standard Threshold Shift — defined as a 10 dB or more average shift at 2000, 3000, and 4000 Hz compared to baseline. Noise-induced hearing loss (NIHL) produces a characteristic notch at 4000 Hz. Normal hearing thresholds are 0–25 dB HL; classifications progress through mild, moderate, severe, and profound ranges.
Hearing Protection Devices (HPDs)
The exam tests knowledge of HPD types (foam earplugs, pre-molded plugs, earmuffs, semi-inserts), the Noise Reduction Rating (NRR), and how to calculate effective protection. OSHA requires dividing the NRR by 2 and subtracting from the measured noise level when using dBA measurements. Proper fit, training, and motivation for consistent HPD use are also tested.
Employee Training and Recordkeeping
Under 29 CFR 1910.95, employers must train employees annually on the effects of noise, purpose and use of HPDs, and audiometric testing procedures. Recordkeeping obligations include retaining audiometric test records for the duration of employment plus 30 years.
- ✓Know OSHA 29 CFR 1910.95 action level (85 dBA TWA) and PEL (90 dBA TWA) from memory
- ✓Practice TWA and noise dose calculations using the 5 dB OSHA exchange rate
- ✓Understand the difference between dosimeters and sound level meters and when each is used
- ✓Memorize the STS definition: average 10 dB shift at 2000, 3000, and 4000 Hz in either ear
- ✓Review baseline audiogram timing rules: within 6 months of program enrollment (preceded by 14-hour quiet)
- ✓Learn audiometer calibration requirements: acoustic daily, exhaustive calibration annually
- ✓Study HPD types and be able to calculate effective attenuation using the NRR formula
- ✓Understand noise-induced hearing loss mechanism — cochlear outer hair cell damage, 4 kHz notch pattern
- ✓Review OSHA recordkeeping requirements: audiometric records retained for duration of employment + 30 years
- ✓Complete at least two timed practice tests simulating exam conditions before test day
Free CAOHC Practice Tests Online
The PDF above is perfect for offline review, but online practice is just as important for building exam confidence. Our CAOHC practice test covers all exam domains with immediate answer feedback, detailed explanations, and timed quiz modes. Use both resources together to maximize your score on exam day.
- +Industry-recognized credential boosts your resume
- +Higher earning potential (10-20% salary increase on average)
- +Demonstrates commitment to professional development
- +Opens doors to advanced career opportunities
- −Exam preparation requires significant time investment (4-8 weeks)
- −Certification fees can be $100-$400+
- −May require continuing education to maintain
- −Some employers may not require certification
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