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Industrial Hygiene

Practice Exam Questions - Bank 2

1. Which of the following is not considered a factor that can influence the effect of noise exposure? (Plog, 11)
a. variation in individual susceptibility
b. intermittent energy of the sound
c. length of employment in the noise environment
d. total duration of exposure
2. Which of the following is not a nontechnical guideline to determine whether the work area has excessive noise levels? (Plog, 11-12)
a. Is it necessary to speak loudly or shout into the ear?
b. Have employees complained of ringing in their ears after work?
c. Are employees volunteering to wear earplugs or muffs?
d. Do employees complain that speech or music is muffled?
3. Which of the following is one of the first signs of oxygen deficiency? (Plog, 23)
a. increased heart beat
b. dizziness
c. increased breathing rate
d. decreased focus
4. To produce an index of general contamination the industrial hygienist take: (Plog, 27)
a. area samples at fixed locations
b. samples taken by following the operator
c. samples from various non-fixed locations
d. samples located throughout a process
5. What is a finely divided liquid suspended in the atmosphere? (Plog, 22)
a. mist
b. smoke
c. gas
d. aerosol
6. What is the 8-hour TWA limit for noise exposure? (CFR 1910.95 Plog, 12)
a. 80 dBA
b. 85 dBA
c. 90 dBA
d. 95 dBA
7. What is the 4-hour TWA limit for noise exposure? (CFR 1910.95, Plog, 12)
a. 80 dBA
b. 85 dBA
c. 90 dBA
d. 95 dBA
8. What instrument is used to measure electric fields at frequencies above 100 kHz: (Plog, 292)
a. magnets resonance meter
b. dipole antenna
c. multi-meter
d. radio frequency detector
9. What is the employer required to do first if permissible limits for noise exposure are exceeded? (Plog, 12)
a. initiate a hearing conservation program
b. use engineering and administrative controls
c. ensure personal protective equipment is used
d. limit work near the source of exposure
10. Dust particles more than this size usually do not remain airborne: (Plog, 22)
a. 1 �m
b. 5 �m
c. 10 �m
d. 15 �m

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