The physical method used to measure aerosol particle size distribution that uses multiple steps in determining sizes of aerosol particles is referred to as
a. the laser scattering method.
b. the Mie-scattering theory.
c. a cascade impactor.
d. none of the above.
ANS: C
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If you mix 0.75 gm of a 1% ointment with 14.25 gm of an ointment base, the resulting 15 gm would be:
A) 5%. B) 0.5%. C) 5.05%. D) 0.05%.
Answer the following statement(s) true (T) or false (F)
1. A broken anesthetic needle occurs most often during maxillary injections. 2. A broken endodontic file does not need to be removed from the canal. 3. A 2 × 2 gauze should be placed at the back of the throat to prevent a crown from going down the throat during cementation. 4. A scavenger unit is not needed on today’s nitrous oxide/oxygen conscious sedation units.
In the timetable of human prenatal development from 1 to 6 weeks, what is stage 1?
A. zygote divides C. early blastocyst B. morula D. fertilization
Ribavirin is active against which of the following? 1. Tuberculosis organisms 2. Influenza virus 3. Respiratory syncytial virus (RSV) 4. Pneumocystis carinii organisms 5. Herpes simplex virus
a. 1 and 3 only
b. 2, 3, and 5 only
c. 1, 2, and 4 only
d. 1, 2, 3, 4, and 5