26. Which of the following was the first widely used antiseptic and disinfectant?
A. Chlorine
B. Phenol
C. Iodine
D. Alcohol
27. If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?
A. 1
B. 5
C. 10
D. 50
28. Microbes can be removed from a liquid solution by the process of
A. filtration
B. freeze-drying
C. osmosis
D. desiccation
29. Which of the following is bactericidal?
A. Membrane filtration
B. Ionizing radiation
C. Freeze-drying
D. Deep freezing
30. Which of the following process can be efficiently carried out by incineration?
A. Sterilization of scalpel blades and needles
B. Sterilization of all glass syringes
C. Sterilization of points of forceps
D. Destruction of contaminated materials