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Hazards & Exposures Flashcards

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

Read the first 7 Hazards & Exposures flashcards as text

  1. A worker is exposed to benzene at 0.4 ppm TWA over an 8-hour shift. The OSHA PEL for benzene is 1 ppm. Which statement best describes this situation?

    Answer: The exposure is in compliance but the OSHA Action Level of 0.5 ppm has not been exceeded

    The OSHA benzene PEL is 1 ppm TWA and the Action Level is 0.5 ppm; at 0.4 ppm the worker is below both thresholds, so compliance is maintained.

  2. Which biological monitoring specimen is MOST appropriate for assessing recent lead exposure in a worker?

    Answer: Blood lead level (BLL)

    Blood lead level is the primary OSHA-mandated biomarker for recent lead exposure because it reflects current absorbed dose.

  3. A confined space contains 16% oxygen. How should this atmosphere be classified?

    Answer: Oxygen-deficient; requires supplied-air respirator or SCBA

    OSHA defines an oxygen-deficient atmosphere as less than 19.5% O₂, requiring supplied-air or SCBA before entry.

  4. A noise dosimeter shows a worker received a dose of 150% over an 8-hour shift. What is the calculated TWA noise level?

    Answer: Approximately 93.5 dBA

    Using the formula TWA = 16.61 × log(D/100) + 90, a dose of 150% yields approximately 93.5 dBA TWA.

  5. Which type of non-ionizing radiation is most associated with photokeratitis ('welder's flash')?

    Answer: Ultraviolet-C (UV-C)

    UV-C (100–280 nm) is most energetic in the ultraviolet range and causes photokeratitis, the painful corneal inflammation known as welder's flash.

  6. A manufacturing plant uses isocyanates in a spray painting operation. What is the primary route of exposure of greatest concern?

    Answer: Inhalation of aerosols and vapors

    Isocyanates are potent respiratory sensitizers, and inhalation of spray aerosols or vapors is the primary route leading to occupational asthma.

  7. Which physical hazard describes low-frequency whole-body vibration (1–80 Hz) that can cause spinal disorders in heavy equipment operators?

    Answer: Whole-body vibration (WBV)

    Whole-body vibration transmitted through the seat to the spine is linked to lumbar disorders in operators of vehicles and heavy equipment.