Question Detail
Question
Which of the following is NOT a method of physical sterilization?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Quaternary ammonium compounds are chemical disinfectants, not a method of physical sterilization. Physical methods of sterilization include heat (autoclaving, boiling), radiation (ionizing radiation), and filtration.
Hint
Think about the direct physical processes used to kill or remove microbes, versus chemical agents.