Sterilization problems
- 1. The heat conduction in dry air is
Options- A. less rapid than in steam
- B. more rapid than in steam
- C. similar to steam
- D. none of these Discuss
Correct Answer: less rapid than in steam
- 2. The destruction of microorganisms by steam may be described as
Options- A. first order chemical reaction
- B. zero order chemical reaction
- C. second order chemical reaction
- D. none of these Discuss
Correct Answer: first order chemical reaction
- 3. For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is
Options- A. 0.5
- B. 0.75
- C. 0.87
- D. 0.37 Discuss
Correct Answer: 0.5
- 4. Sterilization can be carried out by
Options- A. heat
- B. radiation
- C. chemical agents
- D. all of these Discuss
Correct Answer: all of these
- 5. The highest temperature which appears to be feasible for batch sterilization is
Options- A. 121°C
- B. 100°C
- C. 105°C
- D. 130°C Discuss
Correct Answer: 121°C
- 6. The X90 value for a filtration system is
Options- A. the time required to reduce microbial population by 90%
- B. the time required to traverse survivor curve by one log cycle.
- C. the depth required to reduce population by 90%
- D. the depth of the filter required to reduce population by 99% Discuss
Correct Answer: the depth required to reduce population by 90%
- 7. In sterilization process, spore of which of the following organism is considered as control?
Options- A. Bacillus subtilis
- B. Clostridium botulinum
- C. Bacillus stearothermophilus
- D. Aspergillus niger Discuss
Correct Answer: Bacillus stearothermophilus
- 8. The collection efficiency by diffusion increases with
Options- A. decreasing particle size
- B. decreasing air velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
Correct Answer: both (a) and (b)
- 9. Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where NSt is the Stokes number)
Options- A. ?imp = 0.075NSt1.2
- B. ?imp = 0.75NSt1.2
- C. ?imp = 0.25NSt1.2
- D. ?imp = 0.025NSt1.2 Discuss
Correct Answer: ?imp = 0.075NSt1.2
- 10. The K used in the equation for X10=2.303/K depends upon
Options- A. nature of the filter material
- B. linear velocity of the air passing through filter
- C. both (a) and (b)
- D. thickness of the filter Discuss
Correct Answer: both (a) and (b)
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