Physical and Chemical Agents problems
- 1. 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
Correct Answer: tyndallization
- 2. Which is the most important surface active disinfectants?
Options- A. Amphoteric compounds
- B. Cationic compounds
- C. Non-ionic compounds
- D. Anionic compounds Discuss
Correct Answer: Cationic compounds
- 3. 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
Correct Answer: All of these
- 4. Bactericidal concentration of phenol is
Options- A. 0.25%
- B. 0.5%
- C. 0.75%
- D. 1% Discuss
Correct Answer: 1%
- 5. 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
Correct Answer: Both (a) and (b)
- 6. Which of the following is best to sterilize heat labile solutions?
Options- A. Dry heat
- B. Autoclave
- C. Membrane filtration
- D. Pasteurization Discuss
Correct Answer: Membrane filtration
- 7. 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
Correct Answer: high concentration of solutes
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