16. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
A. Chlorination
B. Treating with potassium permanganate
C. UV radiation
D. Treating with bleaching powder
17. Sanitizer used specifically for vitreous enamel are
A. strong alkalis
B. strong acids
C. weak alkali with sodium silicate
D. none of these
18. The common methods used for disinfection in wastewater treatment plants are
A. chlorination
B. UV light
C. both (a) and (b)
D. Phenolic solvent
19. Inhibitors are used along with sanitizer to
A. improve their action
B. to prevent corrosion
C. both (a) and (b)
D. none of these
20. Sanitizers used for rubber made equipment are
A. strong acids
B. strong alkalis
C. combination of both
D. none of these