MCQs Test on Disinfectants.

Multiple Choice Questions on Microbiology: Disinfectants.

MCQs: Antiseptics and Disinfectants.

Quiz

  

Atttempt as many times u like within 45 minutes.

 

1. Which of the following is considered as a most effective disinfectant in the “surfactant” category.
   1.   Cationic surfactants.
   2.   Anionic surfactants
   3.   Amphoteric surfactants.
   4.   All of the above.
2. Which of the following is used as a disinfectant in vapor phase.
   1.   Formaldehyde
   2.   Iodine
   3.   Bromine
   4.   Isopropyl Alcohol.
3. The "Rideal Walker" coefficient is used to identify the strength of a,
   1.   Antiseptic
   2.   Antibiotic
   3.   Antiviral
   4.   All of the above
4. In determination of the Rideal Walker coefficient (UK) the bacterial strain used is,
   1.   Eshericia coli.
   2.   Staphylococcus aureus
   3.   Salmonella typhi
   4.   Pseudomonas aeruginosa
5. Phenol coefficient is used to determine the ----- of a disinfectant.
   1.   Quantity.
   2.   Purity
   3.   Efficiency
   4.   Mechanism of action
6. Most disinfectants kill which form of the pathogenic microorganisms.
   1.   Spores
   2.   Vegetative cells
   3.   Both Spores and vegetative cells.
   4.   All of the above
7. Higher alcohols like Isopropyl alcohol are more germicidal than Ethyl alcohol.
   1.   True
   2.   False
8. Ethyl alcohol is used as skin disinfectant in what concentration?
   1.   50-60% v/v.
   2.   60-70% v/v.
   3.   70-80% v/v.
   4.   None of the above.
9. Isopropyl alcohol is used as skin disinfectant in what concentration?
   1.   50-60% v/v.
   2.   60-70% v/v.
   3.   70-80% v/v.
   4.   None of the above.
10. Iodine is combined with surfactants to produce compounds called,
    1.   Iodophors
    2.   Iodochromes
    3.   Iodogenines
    4.   Iodosurfones
11. The disinfectant which was used by Lister in the first antiseptic surgery is?
    1.   Phenol
    2.   Carbolic acid.
    3.   Cresol
    4.   Chloroxylenol
12. Disinfectants are usually,
    1.   Sporicidal
    2.   Bactericidal
    3.   Bacteriostatic
    4.   All of the above
13. Halogens are known irritants, the only halogen used for “Disinfection” is----.
    1.   Iodine
    2.   Chlorine
    3.   Bromine
    4.   Fluorine
14. Silver nitrate a known disinfectant acts by,
    1.   Coagulation of cytoplasmic proteins.
    2.   Oxidation of cytoplasmic proteins.
    3.   Inhibition of cell wall synthesis.
    4.   Inhibition of protein synthesis.
15. Cresol with soap (Lysol) is more germicidal than phenol itself.
    1.   True.
    2.   False.
16. In case of Quaternary ammonium compound which are most effective as disinfectants,
    1.   Cationic.
    2.   Anionic.
    3.   Amphoteric.
    4.   All of the above.
17. Which of the following is an example of “Aniline Dye”.
    1.   Malachite Green.
    2.   Proflavine.
    3.   Aminacrine.
    4.   Enflavine.
18. Which of the following is an example of “Acridine Dye”.
    1.   Malachite Green.
    2.   Proflavine.
    3.   Crystal Violet.
    4.   Brilliant Green.
19. Which of the following factors affect the action of a disinfection.
    1.   Concentration of a disinfectant.
    2.   Temperature.
    3.   Time of contact.
    4.   All of the above.
20. Disadvantage of phenol coefficient test is / are,
    1.   Only one organism is used.
    2.   No information about tissue toxicity.
    3.   Presence of organic matter is not considered.
    4.   All of the above.
21. In Kelsey-Sykes Test sampling is done at an interval…..
    1.   8-18-28 mins.
    2.   5-10-15 mins.
    3.   6-12-18 mins.
    4.   10-15-20 mins.
22. For purification of swimming pools and water supplies which chemical is preferred?
    1.   Chlorine.
    2.   Bromine.
    3.   Iodine.
    4.   Alcohol.
23. Before injections skin is sterilized with,
    1.   Heavy metals.
    2.   Ethyl Alcohol.
    3.   Iodine.
    4.   Phenol.
24. Alcohol a known disinfectant acts by,
    1.   Coagulation of cytoplasmic proteins.
    2.   Inhibition of cell wall synthesis.
    3.   Inhibition of protein synthesis.
    4.   Oxidation of cytoplasmic proteins.
25. Chick-Martin Test is used to determine----- of a disinfectant,
    1.   Quantity.
    2.   Purity.
    3.   Efficiency.
    4.   Mechanism of action.