CIH Certified Industrial Hygienist (CIH) MCQ 5

Question 1

Which OSHA standard specifically requires employers to implement a written hearing conservation program when noise exposures equal or exceed what action level?

Accepted Answer

85 dBA TWA

Answer

OSHA 29 CFR 1910.95 requires a hearing conservation program when workers are exposed to an 8-hour TWA of 85 dBA or above (the action level).

Question 2

In industrial hygiene sampling, what is the primary purpose of a field blank sample?

Accepted Answer

To detect contamination introduced during sample handling, transport, or analysis

Answer

Field blanks are unexposed media treated identically to field samples to detect contamination during collection, handling, shipping, or laboratory processing.

Question 3

A worker handling lead paint removal is required under 29 CFR 1910.1025 to undergo medical removal if blood lead levels reach:

Accepted Answer

50 µg/dL

Answer

OSHA's lead standard mandates medical removal if a worker's blood lead level reaches 50 µg/dL (general industry) to prevent further health effects.

Question 4

Which type of ventilation system is most effective for controlling contaminants generated at a fixed point source close to the worker's breathing zone?

Accepted Answer

Local exhaust ventilation (LEV)

Answer

Local exhaust ventilation captures contaminants at or near their source before they can disperse into the worker's breathing zone, making it far more effective than dilution ventilation.

Question 5

Raynaud's phenomenon (vibration white finger) is caused by occupational exposure to:

Accepted Answer

Hand-arm vibration from powered hand tools

Answer

Hand-arm vibration syndrome (HAVS), including vibration-induced white finger (Raynaud's phenomenon), results from prolonged use of vibrating hand tools such as jackhammers and chainsaws.

CIH - Certified Industrial Hygienist Exam Practice Test

CIH - Certified Industrial Hygienist Exam Practice Test

CIH Certified Industrial Hygienist (CIH) MCQ 5