Discussion
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- Question
Bactericidal concentration of phenol is
Options- A. 0.25%
- B. 0.5%
- C. 0.75%
- D. 1%
- Correct Answer
- 1%
- 1. Which of the following material is sterilized by heating at 160°C in a hot air oven for one hour?
Options- A. Swab sticks
- B. All-glass syringes
- C. Oils and jellies
- D. All of these Discuss
- 2. Which is the most important surface active disinfectants?
Options- A. Amphoteric compounds
- B. Cationic compounds
- C. Non-ionic compounds
- D. Anionic compounds Discuss
- 3. Steam exposure of a material at 100°C for 20 minutes for three consecutive days is known as
Options- A. inspissation
- B. tyndallization
- C. autoclaving
- D. none of these Discuss
- 4. Which of the following is most effective for sterilizing mattresses and plastic petri plates?
Options- A. Chlorine
- B. Ethylene oxide
- C. Glutaraldehyde
- D. Ultraviolet radiation Discuss
- 5. Which of the following is bactericidal?
Options- A. Membrane filtration
- B. Ionizing radiation
- C. Freeze-drying
- D. Deep freezing Discuss
- 6. Which of the following is/are vapour-phase disinfectant/s?
Options- A. Formaldehyde
- B. Ethylene oxide
- C. Both (a) and (b)
- D. None of these Discuss
- 7. Which of the following is best to sterilize heat labile solutions?
Options- A. Dry heat
- B. Autoclave
- C. Membrane filtration
- D. Pasteurization Discuss
- 8. Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have
Options- A. insufficient nutrients
- B. low pH
- C. high concentration of solutes
- D. toxic alkaline chemicals Discuss
- 9. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
Options- A. demonstrating growth in a nitrogen free medium
- B. cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
- C. measuring15N2 by mass spectrometer
- D. all of the above Discuss
- 10. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
Options- A. Thiobacillus thiooxidans
- B. Desulfotomaculum
- C. Rhodospirillum
- D. Rhodomicrobium Discuss
Physical and Chemical Agents problems
Search Results
Correct Answer: All of these
Correct Answer: Cationic compounds
Correct Answer: tyndallization
Correct Answer: Ethylene oxide
Correct Answer: Ionizing radiation
Correct Answer: Both (a) and (b)
Correct Answer: Membrane filtration
Correct Answer: high concentration of solutes
Correct Answer: all of the above
Correct Answer: Desulfotomaculum
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