CIH Toxicology & Health Risk Assessment 2

Question 1

A Threshold Limit Value-Ceiling (TLV-C) is a concentration that should:

Accepted Answer

Never be exceeded at any time during the work shift

Answer

TLV-C is the ceiling concentration that should never be exceeded, even instantaneously, during any part of the working exposure.

Question 2

Which organization publishes Threshold Limit Values (TLVs) for occupational chemical exposures?

Accepted Answer

ACGIH

Answer

The American Conference of Governmental Industrial Hygienists (ACGIH) publishes TLVs annually based on the best available scientific evidence.

Question 3

Carbon monoxide causes toxicity primarily by:

Accepted Answer

Binding to hemoglobin with greater affinity than oxygen

Answer

Carbon monoxide binds to hemoglobin approximately 200–250 times more strongly than oxygen, forming carboxyhemoglobin and preventing oxygen transport to tissues.

Question 4

In toxicology, a 'sensitizer' is a substance that:

Accepted Answer

Can induce an allergic response upon repeated exposure

Answer

A sensitizer causes an allergic response that develops after repeated exposures; once sensitized, even minute amounts can trigger severe reactions.

Question 5

The No-Observed-Adverse-Effect Level (NOAEL) is defined as:

Accepted Answer

The highest tested dose producing no detectable adverse health effect

Answer

NOAEL is the highest dose in a study at which no statistically or biologically significant increase in adverse effects is observed compared to controls.

CIH - Certified Industrial Hygienist Exam Practice Test

CIH - Certified Industrial Hygienist Exam Practice Test

CIH Toxicology & Health Risk Assessment 2