Industrial Hygiene

Practice Exam Questions - Bank 15

1. Terms used by industrial hygienists to describe the degree of exposure include all of the following, EXCEPT: (Plog, 23)

a. ppm - parts per million
b. mppcf - millions of particles of a particulate per cubic foot of air
c. mg/l - milligrams per liter of a liquid
d. mg/m3 - milligrams of a substance per cubic meter of air

2. Which of the following are main categories of respiratory hazards? (Plog, 23)

a. helium-nitrogen deficiency
b. oxygen deficiency
c. toxic contaminants in the air
d. b and c above

3. What is the percentage of oxygen normally found in the atmosphere at sea level? (Plog, 23)

a. 21 percent
b. 32 percent
c. 42 percent
d. 79 percent

4. What is the percentage of nitrogen and other inert gases normally found in the atmosphere at sea level? (Plog, 23)

a. 21 percent
b. 32 percent
c. 42 percent
d. 79 percent

5. What is the partial pressure of oxygen normally found at sea level when the barometric pressure of 760 mm Hg? found in the atmosphere at sea level? (Plog, 23)

a. 36 mm Hg (760 mm Hg/21)
b. 160 mm Hg (760 mm Hg x .21)
c. 1596 mm Hg (760 mm Hg x 2.1)
d. 3619 mm Hg (760 mm Hg/.21)

6. Oxygen may be deficient in confined spaces for all of the following reasons, EXCEPT: (Plog, 23)

a. consumed by chemical reactions
b. replaced by inert gases
c. relocated to areas of lower pressure
d. absorbed by porous surfaces

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