Practice Test GeeksCOHN Exam Practice Test
← All COHN Flashcard Decks

Ergonomics and Physical Hazards Flashcards

7 cards from real COHN practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Ergonomics and Physical Hazards flashcards as text

  1. An employee works in a boiler room where temperatures regularly exceed 95°F. Which early symptom of heat illness should prompt immediate removal from the environment?

    Answer: Confusion, slurred speech, or cessation of sweating

    Confusion, slurred speech, and anhidrosis (cessation of sweating) are signs of heat stroke — a life-threatening emergency requiring immediate removal and cooling.

  2. Which ergonomic risk factor is most strongly associated with thoracic outlet syndrome in assembly workers?

    Answer: Sustained neck flexion and shoulder elevation

    Sustained forward neck flexion with elevated shoulders compresses neurovascular structures in the thoracic outlet, a common posture in certain assembly and sewing tasks.

  3. The ACGIH TLV for a continuous noise exposure of 8 hours is 85 dBA. If exposure is at 88 dBA, the permissible exposure time under ACGIH criteria is:

    Answer: 4 hours

    ACGIH uses a 3-dB exchange rate, so an increase of 3 dB (from 85 to 88 dBA) halves the permissible exposure time from 8 hours to 4 hours.

  4. A COHN evaluates a production line and finds workers using pliers that require high grip force due to a spring return mechanism. The best ergonomic solution is to:

    Answer: Replace with self-opening (low return-force) pliers

    Self-opening pliers eliminate the need to actively open the tool against a spring, significantly reducing cumulative grip force and MSD risk.

  5. According to NIOSH, the recommended weight limit (RWL) for a lift is calculated. If the RWL is 20 lbs and the actual load is 40 lbs, the Lifting Index (LI) is:

    Answer: 2.0

    LI = Actual Load ÷ RWL = 40 ÷ 20 = 2.0; an LI > 1.0 indicates the task exceeds safe lifting capacity.

  6. Ionizing radiation in the workplace is regulated primarily by which federal agency for occupational exposures?

    Answer: NRC and OSHA jointly

    Occupational ionizing radiation exposure is regulated by the Nuclear Regulatory Commission (NRC) for licensed materials and by OSHA under 29 CFR 1910.1096 for workplace safety.

  7. A worker experiences Raynaud's phenomenon triggered by cold and vibration. Which occupational term specifically describes vibration-induced Raynaud's?

    Answer: Vibration white finger (VWF)

    Vibration white finger (VWF), also called hand-arm vibration syndrome (HAVS), describes the vascular component of vibration-induced injury causing episodic blanching of fingers.