Home › MCQs › PTECH Microbiology › Question #3290
Back to Questions
PTECH Microbiology QUESTION #3290
Question 1
Which concentration of Ethyl Alcohol is most effective as a disinfectant?
  • $100\%$
  • $70\%$✔️
  • $30\%$
  • $10\%$
Correct Answer Explanation
$70\%$ alcohol is more effective than $100\%$ because water is required to denature proteins and penetrate the cell.