2025/2026 ACTUAL QUESTIONS
WITH VERIFIED ACCURATE
ANSWERS || 100% ENDORSED
PASS>LATEST VERSION<
1. Incongruence Theory - ANSWER✓ Disconnect between mature workers
and organizational characteristics
2. Herzberg - ANSWER✓ Hygiene Theory
3. Hygiene Theory - ANSWER✓ We build satisfaction and motivation into the
job
4. Industrial Hygiene - ANSWER✓ Anticipate, recognize, evaluate and control
of health hazards.
5. TLV - ANSWER✓ Threshold limit value, a voluntary limit set by ACGIH.
These are health based values that are set by experts and do not consider
economic or technical feasibility. Nearly all workers can be exposed 8
hours/day, 40 hours/week without adverse health effects.,
,6. ACGIH - ANSWER✓ The American Conference of Governmental
Industrial Hygienists.,
7. STEL - ANSWER✓ Short-term exposure limit, a 15 minute sample is used
to estimate. STEL exposures should not be more than 15 minutes up to 4
times per day. Must have 60 minutes between exposures.
8. Ceiling limit - ANSWER✓ A limit never to be exceeded.
9. Skin designation - ANSWER✓ Potential significant contribution to exposure
through the skin.
10. How do you calculate a time-weighted average? - ANSWER✓ Take each
concentration and multiply it by the sample time for that concentration. Add
together each one in numerator and divide by total time.
TWA = C1T1 + C2T2 + CnTn/T1+T2+Tn
11. How do you calculate an 8 hour time weighted average? - ANSWER✓ Take
each concentration and multiply it by the sample time for that concentration.
Add together each one in numerator and divide by 8 hours (or 480 minutes).
TWA = C1T1 + C2T2 + CnTn/ 8 hours
12. How to convert from mg/m3 to ppm? - ANSWER✓ ppm = mg/m3 X
24.45/MW
13. How to calculate the TLV of a mixture? - ANSWER✓ 1 divided by each
chemical fraction (as a decimal) divided by its TLV added together.
TLV = 1/(f1/TLV1 + f2/TLV2 + fn/TLVn)
14. Industrial hygiene data is normally/log normally distributed? - ANSWER✓
Log normally distributed
15. On a log normal distribution skewed right, where is mean, median, mode?* -
ANSWER✓ The mean will be closest to the tail, the median would be in the
center, and the mode last.
,16. Respirable dust - ANSWER✓ Dust below about 4-5 microns in size, which
is capable of getting down to the gas exchange region of the lungs called the
alveoli.
17. Gravimetric - ANSWER✓ Pre and post weighing of a sample to determine
the change in weight. This is done for particulate samples.
18. Particulate sampling is conducted with what? - ANSWER✓ A sampling
pump, tubing and cassette with filter or a direct reading instrument for dust.
19. What else is needed to collect respirable dust or silica? - ANSWER✓ A
cyclone
20. PID - ANSWER✓ Photoionization detector-a general survey instrument that
provides qualitative information on the amount and class of chemicals
present in air. Used for organic and some inorganic chemicals.
21. Detector Tube - ANSWER✓ A colorimetric tube used with a bellows pump
to detect chemicals in air. Must have the correct tube for what you are trying
to detect. Accuracy is +/-20-25%.
22. Electrochemical sensors - ANSWER✓ Used on confined space monitors for
chemicals like CO, H2S, etc. Must be calibrated.
23. Absorbent - ANSWER✓ A liquid media that absorbs gases and vapors. The
liquid can then be analyzed in the laboratory.
24. Adsorbent - ANSWER✓ A solid media such as activated carbon inside a
tube used to collect gases and vapors.
25. Impinger - ANSWER✓ Used as part of the sampling train with absorbent
liquid media.
26. Sampling train - ANSWER✓ Calibrator, collection device (filter with
cassette, tube, etc.), tubing, pump
27. Charcoal tubes - ANSWER✓ Most common adsorbent media, good for non-
polar compounds, ok up to 90% humidity, desorbed with carbon disulfide.
, 28. Silica gel tubes - ANSWER✓ Good for polar compounds, hydrophilic so not
good in humid environments.
29. Mazlow's Hierarchy of Needs - ANSWER✓ 1. Self Actualization
2. Esteem
3. Social
4. Safety
5. Physiological
30. Pareto Principal - ANSWER✓ The 80-20 Rule
80% of the effects result from 20% of the causes
20% is the vital few
31. Elements of Management - ANSWER✓ 1. Planning
2. Organizing
3. Activating
4. Controlling
5. Decision Making
32. Principals - ANSWER✓ Owners, executives, board members, officers
They set the policies and objectives
33. Chief Executive Officer - ANSWER✓ CEO
Sets the tone for Safety
Leads by example
34. Safety Objectives - ANSWER✓ 1. Humanitarian objectives (injuries,
suffering, etc)
2. Cost reduction
3. Intangible results (morale, public relations)
35. What gives safety authority? - ANSWER✓ The ability to influence line
management