http://gandhijkt.org/https:/appworld.blackberry.com/webstore/content/25536919 PG NEET Microbiology MCQs 5 – Sterilization and Disinfection

  1. Most effective method for sterilization
    1. Hot air
    2. Steam
    3. Steam under pressure
    4. Boiling
      1. Ans(3)
  2. Laparoscopy is sterilized by
    1. 2% formalin
    2. 2% glutaraldehyde
    3. Autoclave
    4. Boiling
      1. Ans(4)
  3. The best way to dispose of hospital – soiled dressings is”
    1. Incineration
    2. Boiling
    3. Autoclave
    4. Disinfection
      1. Ans(1)
  4. Sterilization is defined as
    1. Disinfection of skin
    2. Complete destruction of all microorganisms
    3. Destruction of pathogenic organism
    4. Decrease bacterial count from object
      1. Ans(2)
  5. Which of the following does not kill endospores?
    1. Autoclave
    2. Incineration
    3. Hot air sterilization
    4. Pasteurization
      1. Ans(4)
  6. Cold sterilization is
    1. Sterilization by negative temperature
    2. Sterilization of ionizing radiation
    3. Sterilization by liquid CO2
    4. Sterilization by non –  ionizing radiation
      1. Ans(3)
  7. The sterilization method for the instruments which are damaged by dry heat is:
    1. steam
    2. Radiation
    3. Boiling
    4. Burning
      1. Ans(2)
  8. Seitz filter is a
    1. Candle filter
    2. Asbestos filter
    3. Membrane filter
    4. Sintered glass filters
      1. Ans(2)
  9. Irradiation can be used to sterilize all except
    1. Bone graft
    2. Suture
    3. Artificial tissue graft
    4. Bronchoscopy
      1. Ans(4)
  10. Best virucidal disinfection is:
    1. Phenol
    2. Hypochlorite
    3. BPL
    4. Formaldehyde
      1. Ans(1)
  11. Best method of  sterilization of disposable syringes is
    1. Hot air oven
    2. UV rays
    3. Boiling
    4. Gamma rays
      1. Ans(4)
  12. Lethal effect of dry heat is due to:
    1. Denaturation or proteins
    2. Oxidative Damage
    3. Toxicity due to metabolites
    4. All of the above
      1. Ans(4)
  13. Which of the following is bactericidal?
    1. Membrane filtration
    2. Ionizing radiation
    3. Freeze – drying
    4. All
      1. Ans(2)
  14. New York agar is used for:
    1. Salmonella
    2. Clostridia
    3. Neisseria
    4. Bacillus Anthracis
      1. Ans(3)
  15. In gamma radiation radioactive isotope commonly used is
    1. Cobalt
    2. Carbon
    3. Phosphorus
    4. iodine
      1. Ans(1)
  16. An example of the selective medium is:
    1. LJ medium
    2. Blood agar
    3. Selenite F broth
    4. Chocolate agar
      1. Ans(1)
  17. Which of the following is best to sterilize heat labile solutions?
    1. Dry heat
    2. Auto clave
    3. Membrane filtration
    4. Pasteurization
      1. Ans(3)
  18. Principal of using Robertson cooked meat broth
    1. Meat kills other bacteria
    2. Meat is utilized by anaerobes
    3. Content of meat extract utilize O2
    4. All of the above
      1. Ans(3)
  19. Vaccines are sterilized by
    1. Autoclave
    2. Seitz filtration
    3. Hot air oven
    4. Heat inactivation
      1. Ans(2)
  20. pH of Sabouraud’s dextrose  agar
    1. 7.4
    2. 7.0
    3. 9.6
    4. 5.6
      1. Ans(4)
  21. Membrane filters useful for sterilization are:
    1. Nitrocellulose membranes
    2. Cellulose acetate membranes
    3. Polycarbonate membranes
    4. All of the above
      1. Ans(4)
  22. The medium used for antibiotic sensitivity:
    1. CLED agar
    2. Hektoen agar
    3. Mueller – Hinton Agar
    4. Salt milk agar
      1. Ans(3)
  23. Membrane filters are employed for sterilization of:
    1. Enzyme solutions
    2. Pharmaceuticals
    3. Antisera
    4. All of the above
      1. Ans(4)
  24. Hot air oven is used to sterilize all except
    1. Inoculating loop or wire
    2. Glassware
    3. Dusting powder
    4. Liquid paraffin
      1. Ans(1)
  25.  If the __________________ is too high the established sterilization parameters may not be adequate rendering the sterilization process ineffective
    1. Temperature
    2. Bioburden
    3. pH
    4. vacuum
      1. Ans(2)
  26. Technique of sterilization was introduced by
    1. Robert Koch
    2. Edward Jenner
    3. Louis Pasteur
    4. Lister
      1. Ans(1)
  27. Browne’s tube is used for
    1. Steam sterilization
    2. Rations
    3. Chemical sterilization
    4. Filtration
      1. Ans(1)
  28. Inspissation is used for
    1. Sputum
    2. Protein containing culture medium
    3. Serum containing culture medium
    4. Plasma sterilization
      1. Ans(2)
  29. All of the following are sporicidal except
    1. Glutaraldehyde
    2. Ethylene oxide
    3. Alcohol
    4. stabilized hydrogen peroxide
      1. Ans(3)
  30. High-level disinfectant is used for:
    1. Stethoscopes
    2. Electronic thermometers
    3. Bronchoscopes
    4. Surgical instruments
      1. Ans(3)
  31. Phenolic disinfectant are
    1. Dettol
    2. Cresol
    3. Lysol
    4. all
      1. Ans(4)
  32. Hot air over holding time and temperature:
    1. 121°C for 15 minutes
    2. 160°C for 45 minutes
    3. 135°C for 5 minutes
    4. 190°C for 30 minutes
      1. Ans(4)
  33. The concentration of Lysol used as a disinfectant is:
    1. 0.1%
    2. 0.5%
    3. 10%
    4. 3%
      1. Ans(4)
  34. Horizontal transmission of “R” factor is by
    1. Transduction
    2. Transformation
    3. Conjugation
    4. Fusion
      1. Ans(3)
  35. Which of the following is not a Sterilant agent?
    1. Lysol
    2. Formalin
    3. Glutaraldehyde
    4. None of the above
      1. Ans(1)
  36. Polymerase chain reaction was discovered by:
    1. Saiki
    2. Salk
    3. Watson and Crick
    4. Mekusick
      1. Ans(4)
  37. Sputum can be disinfected by all Except
    1. Autoclaving
    2. Boiling
    3. Cresol
    4. Chlorhexidine
      1. Ans(4)
  38. F plasmid of high-frequency recombination is:
    1. Extrachromosomal
    2. Chromosomal
    3. Mesosomes
    4. Ribosomes
      1. Ans(1)
  39. Savlon contains:
    1. Cetrimade+ chlorhexidine
    2. Cetrimade+ chlorhexidine +butyl alcohol
    3. Cetrimide + bu cetrimide and cetavlon
    4. Cetrimide and cetavlon
      1. Ans(1)
  40. False regarding bacterial plasmids are:
    1. Extrachromosomal
    2. Eliminated by treating with radiation
    3. Transmission of different characters
    4. Can cause lysogenic conversion
      1. Ans(4)
  41. True about glutaraldehyde except
    1. Used as a disinfectant in a concentration of 2%
    2. Sterilize instruments in 25 – 30 min
    3. Endoscopes and bronchoscopes can be disinfected
    4. Solution once made can be used for 7 – 10
      1. Ans(2)
  42. Durg resistance transfer by bacteriophage involves:
    1. Transduction
    2. Conjugation
    3. Transformation
    4. Convocation
      1. Ans(1)
  43. Chlorination does not affect
    1.  Vibrio
    2. HIV
    3. E. Coli
    4. Poliovirus
      1. Ans(4)
  44. The segment of DNA between chromosomal and extrachromosomal DNA molecules within the cells are:
    1. Transposons
    2. Cosmid
    3. Plasmid
    4. Episomes
      1. Ans(1)
  45. Heat-labile instruments for use in surgical procedure can be best sterilized by
    1. Absolute alcohol
    2. Ultraviolet rays
    3. Chlorine-releasing compounds
    4. Ethylene oxide gas
      1. Ans(4)
  46. True about transferable resistance
    1. High degree of resistance
    2. Involves resistance to multiple drugs
    3. Plasmids play a role
    4. All of the above
      1. Ans(4)
  47. The operating temperature in an ethylene oxide sterilization during a warm cycle is:
    1. 20 – 35°C
    2. 49 -63 °C
    3. 68-88°C
    4. 92-110°C
      1. Ans(2)
  48. Phage typing is useful as an epidemiological tool in all except:
    1. Salmonella
    2. Staph aureus
    3. V.cholerae
    4. Shigella dysenteries
      1. Ans(1)
  49. Which of the following is most effective for sterilizing mattresses and plastic Petri Plates?
    1. Chlorine
    2. Glutaraldehyde
    3. Autoclave
    4. Ethylene oxide
      1. Ans(4)
  50. Plasmid
    1. Involved in multi-drug resistance transfer
    2. Involved in conjugation
    3. Impacts capsule formation
    4. Impacts pili formation
      1. Ans(1)

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