1. Which has to be considered when using chlorine to treat water? A. Chlorine is

Question

1. Which has to be considered when using chlorine to treat water?
        A. Chlorine is inactivated by organic matter
        B. Some protozoan cysts may survive chlorination
        C. Dilutions of chlorine have to be made fresh because they have a short shelf life
        D. All of the above has to be considered

2. Betadine is a good antiseptic, it has low toxicity, and reliably destroys bacterial endospores
        A. True
        B. False

3. Hydrogen peroxide is not an effective antiseptic, because human blood and skin has catalases that destroy hydrogen peroxide
      A. True
     B. False

4. Which can be a tuberculocidal antimicrobial agent?
        A. high concentration phenolic solutio
        B. glutaraldehyde solutions
        C.peracetic acid
        D. all are tuberculocida

5. Which is a low level disinfectant that can also be used as antiseptics?
         A. quaternary ammonium compounds
         B. hydrogen peroxide in the vapor phase
        C. peracetic acid
        D. chlorine solutions

Explanation / Answer

1. Option D is correct.

Chlorine is inactivated by organic dirt. Some protozoan cysts may survive chlorination. Chlorine produces free radicals which are very labile.

2. FALSE

Bacterial endospores are resistant to beta-diene.

3. TRUE

Catalase inactivates H2O2 by converting it to H2O and O2.

4. Option D is correct.

All the given compounds act against mycobacteria.

5. Option A is correct.

Quaternary ammonium compounds can be used as low-level disinfectants.

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