Which of the following are used to control gram-positive pathogenic bacteria by chemical method?
a) phenolics
b) alcohols
c) chlorine
d) formaline
Among halogens, which of the following is used to disinfect drinking water?
a) fluorine
b) chlorine
c) iodine
d) bromine
Among halogens, which of the following is used as antiseptic?
a) fluorine
b) chlorine
c) tincture iodine
d) bromine
Which of the following are used to wipe off microbes from skin before injection?
a) phenolics
b) alcohols
c) chlorine
d) formaline
Explanation: alcohols kill bacteria and evaporate leaving behind no residue
Which of the following heavy metal/s is/are used as disinfectant against skin wounds, in pools, fish tanks, dandruff shampoo and mouthwashes?
a) copper
b) selenium
c) mercury and zinc
d) all of these
Which of the following is/are used to preserve biological specimens?
a) phenolics
b) alcohols
c) chlorine
d) formaline
Explanation: also called formaldehyde, which inactivates bacteria in vaccines
