MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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. | |
| 2. |
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 | |
| 3. |
Which of the following are resistant to desiccation? |
| A. | gonococci |
| B. | streptococci |
| C. | meningococci |
| D. | bacillus |
| Answer» C. meningococci | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
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 | |
| 7. |
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 | |
| 8. |
Which of the following are resistant to desiccation?$ |
| A. | gonococci |
| B. | streptococci |
| C. | meningococci |
| D. | bacillus |
| Answer» C. meningococci | |
| 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. |
Wavelengths around ___________ have the highest bactericidal efficiency. |
| A. | 150 √Ö |
| B. | 3900 √Ö |
| C. | 2650 √Ö |
| D. | 1500 √Ö |
| Answer» D. 1500 ‚Äö√†√∂‚àö√± | |
| 12. |
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. | |
| 13. |
Which of the following instruments is used to perform tyndallization? |
| A. | Autoclave |
| B. | Steam Arnold |
| C. | Gas oven |
| D. | Incubator |
| Answer» C. Gas oven | |
| 14. |
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 | |
| 15. |
Some amount of air is also essential inside the chamber of the autoclave. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
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 | |
| 17. |
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 | |
| 18. |
Which of the following conditions are required for 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 | |
| 19. |
Vegetative cells are much more sensitive to heat than are spores. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
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 | |
| 21. |
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 | |