MCQOPTIONS
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MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Physical and Chemical Agents knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following are generally applied on living animal tissues? |
| A. | Antiseptics |
| B. | Disinfectants |
| C. | Preservatives |
| D. | Sanitizer |
| Answer» B. Disinfectants | |
| 2. |
The process of killing all microorganisms along with their spores is ____________________ |
| A. | Disinfection |
| B. | Antisepsis |
| C. | Sanitization |
| D. | Sterilization |
| Answer» E. | |
| 3. |
Escherichia coli is much more resistant to cationic disinfectants than Staphylococcus aureus. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Which of the following is not a chemical agent for microbial control? |
| A. | Radiations |
| B. | Antibiotics |
| C. | Antiseptics |
| D. | Germicide |
| Answer» B. Antibiotics | |
| 5. |
Which of the following is the characteristics of a sanitizer? |
| A. | destroys all microbial forms |
| B. | prevents the growth or action of microorganisms |
| C. | reduces the microbial population to safe levels |
| D. | kills all the bacteria and the bacterial spores |
| Answer» D. kills all the bacteria and the bacterial spores | |
| 6. |
For using any chemical agent, we need to increase the temperature of the environment. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
An agent that prevents the growth of bacteria are known as __________________ |
| A. | Bactericide |
| B. | Bacteriostatic |
| C. | Antimicrobial |
| D. | Antibiotic |
| Answer» C. Antimicrobial | |
| 8. |
A chemical agent that kills the microorganisms and is commonly applied to substances used on inanimate objects are _______________ |
| A. | Antiseptics |
| B. | Sanitizer |
| C. | Disinfectants |
| D. | Antibiotics |
| Answer» D. Antibiotics | |
| 9. |
Which material is used for the Berkefeld filter? |
| A. | diatomaceous earth |
| B. | asbestos pad |
| C. | porcelain |
| D. | sintered glass disks |
| Answer» B. asbestos pad | |
| 10. |
Which of the following inhibits DNA replication? |
| A. | cathode rays |
| B. | UV light |
| C. | x-rays |
| D. | gamma rays |
| Answer» C. x-rays | |
| 11. |
Which disinfectant was the most effective against Salmonella"? |
| A. | Phenol |
| B. | Cetylpyridinium chloride |
| C. | Hexachlorophene |
| D. | Merthiolate |
| Answer» E. | |
| 12. |
Which disinfectant would be most effective against Staphylococcus found in a blood spill? |
| A. | Phenol |
| B. | Cetylpyridinium chloride |
| C. | Hexachlorophene |
| D. | None of these |
| Answer» E. | |
| 13. |
Which of the following conditions are required for the determination of thermal death time? |
| A. | temperature is varied |
| B. | time is fixed |
| C. | temperature is fixed and time is varied |
| D. | temperature is fixed and time is not selected |
| Answer» D. temperature is fixed and time is not selected | |
| 14. |
Vegetative cells are much more sensitive to heat than are spores. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
How much time is required by spores of Clostridium botulinum to be killed by moist heat at 1200C? |
| A. | 2 hours |
| B. | 4 to 20 minutes |
| C. | 24 hours |
| D. | 6-7 hours |
| Answer» C. 24 hours | |
| 16. |
Wavelengths around ___________ have the highest bactericidal efficiency. |
| A. | 150 |
| B. | 3900 |
| C. | 2650 |
| D. | 1500 |
| Answer» D. 1500 | |
| 17. |
Which of the following radiations have the energy to knock electrons away from molecules and ionize them? |
| A. | Non-ionizing radiations |
| B. | Acoustic radiations |
| C. | Subatomic particles |
| D. | Ionizing radiations |
| Answer» E. | |
| 18. |
Passage of water from a low solute concentration into the cell is referred to as ______________ |
| A. | plasmoptysis |
| B. | plasmolysis |
| C. | isotonic |
| D. | hypertonic |
| Answer» B. plasmolysis | |
| 19. |
Which of the following are resistant to desiccation? |
| A. | gonococci |
| B. | streptococci |
| C. | meningococci |
| D. | bacillus |
| Answer» C. meningococci | |
| 20. |
Which of the following actions occur due to low temperature? |
| A. | coagulation of proteins |
| B. | death of microorganisms |
| C. | rate of metabolism is reduced |
| D. | denatures proteins |
| Answer» D. denatures proteins | |
| 21. |
Which of the following instruments is used to perform tyndallization? |
| A. | Autoclave |
| B. | Steam Arnold |
| C. | Gas oven |
| D. | Incubator |
| Answer» C. Gas oven | |
| 22. |
If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound? |
| A. | 1 |
| B. | 5 |
| C. | 10 |
| D. | 50 |
| Answer» D. 50 | |
| 23. |
Which of the following methods is used for killing microorganisms of only certain types and not all microorganisms? |
| A. | Pasteurization |
| B. | Incineration |
| C. | Boiling water |
| D. | Fractional Sterilization |
| Answer» B. Incineration | |
| 24. |
Some amount of air is also essential inside the chamber of the autoclave. |
| A. | True |
| B. | False |
| Answer» C. | |
| 25. |
The general pressure at which the autoclave is operated is ___________ |
| A. | 5 Psi |
| B. | 20 Psi |
| C. | 15 Psi |
| D. | 40 Psi |
| Answer» D. 40 Psi | |
| 26. |
Which of the following apparatus is used to provide steam under regulated pressure? |
| A. | autoclave |
| B. | laminar air flow |
| C. | incubator |
| D. | hot oven |
| Answer» B. laminar air flow | |
| 27. |
Among the following which one is the most effective method of killing microorganisms? |
| A. | High temperature |
| B. | Low temperature |
| C. | High temperature, high moisture |
| D. | Low temperature, high moisture |
| Answer» D. Low temperature, high moisture | |