Question 1

All of the following are correct about food irradiation, except:

Accepted Answer

A)  food is not made radioactive by the process.
B)  the World Health Organization does not endorse this process.
C)  it is approved in the U.S.for beef, chicken, and pork.
D)  it can lead to a longer shelf life for the irradiated food.
E)  no irradiated food can be sold without clear labeling.F) All of the above
G) B) and C)

Question 2

All of the following are benefits of food irradiation, except:

Accepted Answer

A)  it can kill bacterial pathogens on the food.
B)  it can kill insects on the food.
C)  it can inhibit the sprouting of white potatoes.
D)  it can reduce the number of food-borne deaths each year.
E)  it makes the food less nutritious.F) All of the above
G) B) and D)

Question 3

The shortest time required to kill all the microbes in a sample at a specified temperature is called the:

Accepted Answer

A)  thermal death point (TDP) .
B)  thermal death time (TDT) .
C)  sporicidal time.
D)  death phase point.
E)  None of the choices are correct.F) B) and E)
G) All of the above

Question 4

Which control method would not be a suitable choice for killing Mycobacteria in a capped culture tube?

Accepted Answer

A)  ultraviolet (germicidal)  light
B)  gamma rays
C)  121 ∘\circ∘  C at 15 psi for 15 minutes
D)  160 ∘\circ∘  C for 2 hours
E)  All of the choices are correct. F) All of the above
G) C) and E)

Question 5

Dry heat:

Accepted Answer

A)  is less efficient than moist heat.
B)  cannot sterilize.
C)  includes tyndallization.
D)  is used in devices called autoclaves.
E)  will sterilize at 121 ∘\circ∘  C for 15 minutes. F) None of the above
G) B) and C)

Question 6

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Accepted Answer

A)  hydrogen peroxide
B)  chloramines
C)  fluorine
D)  quaternary ammonium compounds
E)  sodium iodideF) D) and E)
G) C) and E) B

Question 7

Sterilization is achieved by:

Accepted Answer

A)  flash pasteurization.
B)  hot water.
C)  boiling water.
D)  steam autoclave.
E)  All of the choices are correct.F) C) and E)
G) B) and E)

Question 8

Bacteriocidal agents are sterilants.

Accepted Answer

A) True 
 B)False

Question 9

The compound that is an organic base containing chlorine and two phenolic rings and is used increasingly for handscrubbing, neonatal washes, wound degerming, and prepping surgical skin sites is:

Accepted Answer

A)  Carbolic acid.
B)  Chlorhexidine.
C)  Triclosan.
D)  Formalin.
E)  Quarternary ammonium compounds.F) A) and C)
G) None of the above B

Question 10

Which of the following is not used as an antiseptic?

Accepted Answer

A)  iodophor
B)  chlorhexidine
C)  3% hydrogen peroxide
D)  Merthiolate
E)  aqueous glutaraldehydeF) A) and D)
G) B) and E) E

Question 11

Electrons are ejected from atoms in cells when organisms are exposed to:

Accepted Answer

A)  dessication.
B)  ultraviolet light.
C)  ethyl alcohol.
D)  hydrogen peroxide.
E)  gamma rays and X rays.F) B) and E)
G) C) and D)

Question 12

All of the following are methods of disinfection or sterilization, except:

Accepted Answer

A)  gamma radiation.
B)  dry oven.
C)  lyophilization.
D)  triclosan.
E)  ethanol.F) A) and E)
G) C) and D)

Question 13

The easiest microbial forms to kill or inhibit are:

Accepted Answer

A)  naked viruses.
B)  vegetative bacteria and fungi.
C)  endospores.
D)  protozoan cysts.
E)  Mycobacterium and Staphylococcus.F) C) and E)
G) None of the above

Question 14

Bacteriostatic agents kill bacterial cells.

Accepted Answer

A) True 
 B)False

Question 15

Filtration is an effective method to remove microbes from air and liquids.

Accepted Answer

A) True 
 B)False

Question 16

_____ heat is more rapidly effective and efficient compared to _____ heat.

Accepted Answer

The answer of _____ heat is more rapidly effective and...

Question 17

Isopropyl alcohol wiped across a skin site can sterilize it.

Accepted Answer

A) True 
 B)False

Question 18

A method for sterilizing milk, called _____ temperature treatment, uses 134$\circ$ C for 1 to 2 seconds.

Accepted Answer

Question 19

__________ or steam sterilization is the process by which steam is heated under pressure to sterilize objects.

Accepted Answer

The answer of __________ or steam sterilization is the process...

Question 20

HEPA filters are used to remove microbes from:

Accepted Answer

A)  air.
B)  liquids.
C)  human tissues.
D)  medical instruments.
E)  All of the choices are correct.F) C) and D)
G) A) and B)

Exam 11: Physical and Chemical Agents for Microbial Control

All of the following are correct about food irradiation, except:

Correct AnswerverifiedShow Answer

All of the following are benefits of food irradiation, except:

Correct AnswerverifiedShow Answer

The shortest time required to kill all the microbes in a sample at a specified temperature is called the:

Correct AnswerverifiedShow Answer

Which control method would not be a suitable choice for killing Mycobacteria in a capped culture tube?

Correct AnswerverifiedShow Answer

Dry heat:

Correct AnswerverifiedShow Answer

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Correct AnswerverifiedB

Sterilization is achieved by:

Correct AnswerverifiedShow Answer

Bacteriocidal agents are sterilants.

Correct AnswerverifiedShow Answer

The compound that is an organic base containing chlorine and two phenolic rings and is used increasingly for handscrubbing, neonatal washes, wound degerming, and prepping surgical skin sites is:

Correct AnswerverifiedB

Which of the following is not used as an antiseptic?

Correct AnswerverifiedE

Electrons are ejected from atoms in cells when organisms are exposed to:

Correct AnswerverifiedShow Answer

All of the following are methods of disinfection or sterilization, except:

Correct AnswerverifiedShow Answer

The easiest microbial forms to kill or inhibit are:

Correct AnswerverifiedShow Answer

Bacteriostatic agents kill bacterial cells.

Correct AnswerverifiedShow Answer

Filtration is an effective method to remove microbes from air and liquids.

Correct AnswerverifiedShow Answer

_____ heat is more rapidly effective and efficient compared to _____ heat.

Correct AnswerverifiedShow Answer

Isopropyl alcohol wiped across a skin site can sterilize it.

Correct AnswerverifiedShow Answer

A method for sterilizing milk, called _____ temperature treatment, uses 134 ∘\circ∘ C for 1 to 2 seconds.

Correct AnswerverifiedShow Answer

__________ or steam sterilization is the process by which steam is heated under pressure to sterilize objects.

Correct AnswerverifiedShow Answer

HEPA filters are used to remove microbes from:

Correct AnswerverifiedShow Answer

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B

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B

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E

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_ heat is more rapidly effective and efficient compared to _ heat.

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A method for sterilizing milk, called _____ temperature treatment, uses 134^$\circ$ C for 1 to 2 seconds.

Correct Answer
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