Sterilization and Disinfection Principles
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Questions and Answers

What is the optimum bactericidal concentration of alcohol solutions in water?

  • 30%–40%
  • 10%–20%
  • 40%–50%
  • 60%–90% (correct)

    • What is the difference between sterilization and disinfection?

  • Sterilization uses chemicals, while disinfection uses heat.
  • Sterilization destroys all microorganisms including spores, while disinfection kills many but not all microorganisms. (correct)
  • Sterilization removes microbes that may cause disease, while disinfection destroys all microorganisms.
  • Sterilization is only done by filtration, while disinfection is done by chemicals.

    • Which type of heat sterilization can be achieved through autoclaving?

  • Moist heat (correct)
  • Dry heat
  • Chemical
  • Radiation

    • What is the primary mechanism of sterilization by heat?

    <p>Denaturing proteins</p> Signup and view all the answers

    What are the two variables primarily affecting the rate of killing of microorganisms?

    <p>Concentration of the killing agent and length of time used</p> Signup and view all the answers

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