Question 1

Ethylene oxide is

Accepted Answer

A)  only effective with high heat.
B)  a halogen.
C)  the active agent in household bleach.
D)  used as an antiseptic against anaerobes.
E)  sporicidal.F) A) and C)
G) All of the above

Question 2

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

Accepted Answer

A)  High; dry
B)  High; moist
C)  Dry; moist
D)  Moist; dry
E)  Moist; highF) C) and D)
G) A) and D)

Question 3

The shortest time required to kill or inactivate 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) A) and D)
F) C) and D) B

Question 4

Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Accepted Answer

A) True 
 B)False  True

Question 5

Intermittent sterilization, which uses 3 days of lower temperature steam for short periods of time, is also called ______.

Accepted Answer

A)  pasteurization
B)  incubation
C)  tyndallization
D)  disinfection
E)  desiccationF) C) and D)
G) D) and E)

Question 6

_____ solution was introduced in the late 19th century for preventing gonococcal infections in a newborn's eyes after exposure to the mother's infected birth canal.

Accepted Answer

A)  Merthiolate
B)  Silver nitrate
C)  Triclosan
D)  Zinc oxide
E)  BetadineF) A) and B)
G) B) and C)

Question 7

Which of the following is not a heavy metal?

Accepted Answer

A)  Tincture of iodine
B)  Merthiolate
C)  Silver nitrate solution
D)  Zinc
E)  MercurochromeF) B) and E)
G) A) and D)

Question 8

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) A) and E)
G) C) and D)

Question 9

You have inherited some old glass baby milk bottles from your grandmother, and you would like to use them instead of plastic bottles.The bottles are placed into a large metal container and placed in the oven at 325oF for about 2 hours.What factor would you change if you wanted the sterilization to occur much quicker?

Accepted Answer

A)   Place the bottles outside in the sunlight and then place in the oven
B)   Use a pressure cooker to sterilize the bottles with steam
C)   Pour an antimicrobial chemical into the bottles before placing into the oven
D)   Increase the temperature of the oven by 5 degreesE) A) and B)
F) A) and C)

Question 10

Pasteurization is used to sterilize milk.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following factors will influence the action of microbial agents?

Accepted Answer

A)  The number of microorganisms
B)  The type of microorganisms present
C)  Temperature and pH
D)  Mode and dosage of the agent
E)  All of the choices will influence the action.F) A) and C)
G) B) and C)

Question 12

The use of filtration for sterilization

Accepted Answer

A)  leaves behind endospores.
B)  removes toxins.
C)  uses heat and filtration.
D)  relies on gravity.
E)  can remove viruses.F) A) and E)
G) B) and C)

Question 13

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°C for 15 minutes.F) B) and C)
G) C) and D)

Question 14

Organisms in the genus Pseudomonas are resistant to quats.

Accepted Answer

A) True 
 B)False

Question 15

Disinfection of beverages such as apple juice, milk, and wine is optimally achieved by ______.

Accepted Answer

A)  filtration
B)  chlorination
C)  pasteurization
D)  boiling water
E)  moist heat autoclaveF) C) and D)
G) A) and B)

Question 16

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Accepted Answer

A)  Iodine
B)  Chlorine
C)  Bromine
D)  Fluorine
E)  BetadineF) A) and C)
G) C) and D)

Question 17

Which of the following is not used as an antiseptic?

Accepted Answer

A)  Iodophor
B)  Aqueous glutaraldehyde
C)  3% hydrogen peroxide
D)  Chlorhexidine
E)  MerthiolateF) A) and C)
G) B) and E)

Question 18

Pasteurization

Accepted Answer

A)  kills all vegetative forms.
B)  reduces the number of vegetative forms.
C)  reduces the number of endospores.
D)  increases food nutrient value.
E)  is used to sterilize food products.F) A) and E)
G) B) and E)

Question 19

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following represents the use of osmotic pressure as a microbial control method?

Accepted Answer

A)  Exposing dental equipment to UV light
B)  Bleaching a kitchen counter
C)  Salting of meat
D)  Rinsing of a cut with BetadineE) None of the above
F) C) and D) C

Exam 11: Physical and Chemical Control of Microbes

Ethylene oxide is

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
B

Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Correct Answer
verified
True

Intermittent sterilization, which uses 3 days of lower temperature steam for short periods of time, is also called ______.

Correct Answer
verified

_____ solution was introduced in the late 19th century for preventing gonococcal infections in a newborn's eyes after exposure to the mother's infected birth canal.

Correct Answer
verified

Which of the following is not a heavy metal?

Correct Answer
verified

Sterilization is achieved by

Correct Answer
verified

Correct Answer
verified

Pasteurization is used to sterilize milk.

Correct Answer
verified

Which of the following factors will influence the action of microbial agents?

Correct Answer
verified

The use of filtration for sterilization

Correct Answer
verified

Dry heat

Correct Answer
verified

Organisms in the genus Pseudomonas are resistant to quats.

Correct Answer
verified

Disinfection of beverages such as apple juice, milk, and wine is optimally achieved by ______.

Correct Answer
verified

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Correct Answer
verified

Which of the following is not used as an antiseptic?

Correct Answer
verified

Pasteurization

Correct Answer
verified

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Correct Answer
verified

Which of the following represents the use of osmotic pressure as a microbial control method?

Correct Answer
verified
C

Exam 11: Physical and Chemical Control of Microbes

Ethylene oxide is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

Aniline dyes like crystal violet have antimicrobial activity particularly against gram-positive bacteria and some fungi.

Correct AnswerverifiedTrue

Intermittent sterilization, which uses 3 days of lower temperature steam for short periods of time, is also called ______.

Correct AnswerverifiedShow Answer

_____ solution was introduced in the late 19th century for preventing gonococcal infections in a newborn's eyes after exposure to the mother's infected birth canal.

Correct AnswerverifiedShow Answer

Which of the following is not a heavy metal?

Correct AnswerverifiedShow Answer

Sterilization is achieved by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Pasteurization is used to sterilize milk.

Correct AnswerverifiedShow Answer

Which of the following factors will influence the action of microbial agents?

Correct AnswerverifiedShow Answer

The use of filtration for sterilization

Correct AnswerverifiedShow Answer

Dry heat

Correct AnswerverifiedShow Answer

Organisms in the genus Pseudomonas are resistant to quats.

Correct AnswerverifiedShow Answer

Disinfection of beverages such as apple juice, milk, and wine is optimally achieved by ______.

Correct AnswerverifiedShow Answer

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Correct AnswerverifiedShow Answer

Which of the following is not used as an antiseptic?

Correct AnswerverifiedShow Answer

Pasteurization

Correct AnswerverifiedShow Answer

Chlorine compounds remain stable and effective in the presence of excess organic matter.

Correct AnswerverifiedShow Answer

Which of the following represents the use of osmotic pressure as a microbial control method?

Correct AnswerverifiedC

Correct Answer
verified

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

Correct Answer
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B

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True

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C