COSS Industrial Hygiene 3

Question 1

The dose-response relationship in toxicology demonstrates which fundamental principle?

Accepted Answer

The greater the dose, the greater the biological response

Answer

Any exposure to a toxic substance is equally harmful regardless of amount

Answer

Toxic substances only cause harm above their TLV

Answer

Lower doses of toxic substances have no measurable biological effect

Question 2

Under OSHA's Occupational Noise Exposure standard (29 CFR 1910.95), a Hearing Conservation Program must be implemented when employee TWA noise exposures reach or exceed which level?

Accepted Answer

85 dBA

Answer

80 dBA

Answer

90 dBA

Answer

95 dBA

Question 3

What industrial hygiene term describes the concentration of a chemical at which 50% of a test animal population dies in a specified time period during inhalation exposure?

Accepted Answer

LC50

Answer

LD50

Answer

IDLH

Answer

TLV-C

Question 4

Which industrial hygiene term refers to the minimum concentration of a flammable vapor in air below which ignition cannot occur?

Accepted Answer

Lower explosive limit (LEL)

Answer

Upper explosive limit (UEL)

Answer

Autoignition temperature

Answer

Flash point

Question 5

When evaluating heat stress in workers, which index accounts for temperature, humidity, radiant heat, and air movement?

Accepted Answer

Wet Bulb Globe Temperature (WBGT)

Answer

Heat Index (HI)

Answer

Apparent Temperature (AT)

Answer

Effective Temperature (ET)

Question 6

Which type of respirator provides the highest level of respiratory protection by supplying breathable air from an independent source?

Accepted Answer

Self-contained breathing apparatus (SCBA)

Answer

Air-purifying respirator (APR) with P100 filters

Answer

Powered air-purifying respirator (PAPR)

Answer

Supplied-air respirator in demand mode

Question 7

Industrial hygiene qualitative exposure assessments are MOST useful during which phase of the hazard management process?

Accepted Answer

During initial hazard recognition to prioritize which operations need quantitative monitoring

Answer

After air sampling results confirm exposures above the PEL

Answer

Only when quantitative sampling equipment is unavailable

Answer

After engineering controls have been installed to verify their effectiveness