COHN COHN-S 4

Question 1

Which toxicological concept describes the dose below which no adverse effect is observed in a study population?

Accepted Answer

No-observed-adverse-effect level (NOAEL)

Answer

The NOAEL is the highest dose in a toxicology study at which no statistically significant adverse effects are observed.

Question 2

A manufacturing employee reports that a co-worker has threatened to 'settle the score' after a disciplinary action. A COHN-S should FIRST:

Accepted Answer

Notify security and management immediately

Answer

Workplace violence threats require immediate notification of security and management to assess risk and protect employee safety.

Question 3

The ACGIH Threshold Limit Value-Short Term Exposure Limit (TLV-STEL) is defined as the concentration to which workers can be exposed for up to:

Accepted Answer

15 minutes without adverse effects

Answer

The TLV-STEL is a 15-minute time-weighted average concentration that should not be exceeded during any 15-minute period in the workday.

Question 4

In occupational health program evaluation, which metric measures the ratio of benefits gained to program costs?

Accepted Answer

Return on investment (ROI)

Answer

ROI calculates the financial return relative to the cost of a program, expressed as a percentage, and is key to demonstrating program value.

Question 5

A COHN-S is reviewing noise dosimetry results. A worker's full-shift dose reads 105%. Per OSHA 29 CFR 1910.95, which action is REQUIRED?

Accepted Answer

Enroll the worker in a hearing conservation program

Answer

OSHA requires enrollment in a hearing conservation program when an employee's noise exposure equals or exceeds an 8-hour TWA of 85 dBA (50% dose = 85 dBA, so 105% = well above action level).

COHN Exam Practice Test

COHN Exam Practice Test

COHN COHN-S 4