Physical Agents MCQ

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• Which material is used for the Berkefeld filter?
  ক

  diatomaceous earth

  খ

  asbestos pad

  গ

  porcelain

  ঘ

  sintered glass disks
• Wavelengths around ___________ have the highest bactericidal efficiency.
  ক

  150 Å

  খ

  3900 Å

  গ

  2650 Å

  ঘ

  1500 Å
• Which of the following radiations have the energy to knock electrons away from molecules and ionize them?
  ক

  Non-ionizing radiations

  খ

  Acoustic radiations

  গ

  Subatomic particles

  ঘ

  Ionizing radiations
• Passage of water from a low solute concentration into the cell is referred to as ______________
  ক

  plasmoptysis

  খ

  plasmolysis

  গ

  isotonic

  ঘ

  hypertonic
• Which of the following are resistant to desiccation?
  ক

  gonococci

  খ

  streptococci

  গ

  meningococci

  ঘ

  bacillus
• Which of the following actions occur due to low temperature?
  ক

  coagulation of proteins

  খ

  death of microorganisms

  গ

  rate of metabolism is reduced

  ঘ

  denatures proteins
• Which of the following instruments is used to perform tyndallization?
  ক

  Autoclave

  খ

  Steam Arnold

  গ

  Gas oven

  ঘ

  Incubator
• Which of the following methods is used for killing microorganisms of only certain types and not all microorganisms?
  ক

  Pasteurization

  খ

  Incineration

  গ

  Boiling water

  ঘ

  Fractional Sterilization
• Some amount of air is also essential inside the chamber of the autoclave.
  ক

  True

  খ

  False
• The general pressure at which the autoclave is operated is ___________
  ক

  5 Psi

  খ

  20 Psi

  গ

  15 Psi

  ঘ

  40 Psi
• Which of the following apparatus is used to provide steam under regulated pressure?
  ক

  autoclave

  খ

  laminar air flow

  গ

  incubator

  ঘ

  hot oven
• Which of the following conditions are required for the determination of thermal death time?
  ক

  temperature is varied

  খ

  time is fixed

  গ

  temperature is fixed and time is varied

  ঘ

  temperature is fixed and time is not selected
• Vegetative cells are much more sensitive to heat than are spores.
  ক

  True

  খ

  False
• How much time is required by spores of Clostridium botulinum to be killed by moist heat at 1200C?
  ক

  2 hours

  খ

  4 to 20 minutes

  গ

  24 hours

  ঘ

  6-7 hours
• Among the following which one is the most effective method of killing microorganisms?
  ক

  High temperature

  খ

  Low temperature

  গ

  High temperature, high moisture

  ঘ

  Low temperature, high moisture