Properties of Disinfection

This set of MCQs helps students to learn about disinfection defined and describes a process that eliminates many or all pathogenic microorganisms, except bacterial spores, on inanimate objects . In health-care settings, objects usually are disinfected by liquid chemicals or wet pasteurization and its properties.

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Which water treatment process is done after filtration of water?

Primary sedimentation Disinfection Secondary sedimentation Flocculation

Which of the following is wrong regarding disinfection?

It should be readily available at reasonable cost Its method of application should be simple It should render the water toxic for its intended use It should act as safeguard against re-contamination

Boiling of water is a _____ method of disinfection.

Physical Chemical Mechanical Electrical

Sunlight is a ________ method of disinfection.

Physical Chemical Mechanical Electrical

Which of the following is a chemical method of disinfection?

Disinfection by heat Disinfection by light Metal ions Metal ions, Alkalis and acids

Which minor method of disinfection is effective in complete sterilization of water?

Boiling method Excess lime treatment Silver treatment Ultraviolet ray treatment

What is the dose of lime required in the excess lime treatment?

10-20ppm 0-10ppm 5-10ppm 5-20ppm

At what pH, the E-Coli bacteria will die in the water?

6 7 9 >9.5