WorksheetsOS
Total questions: 50
Worksheet time: 25mins
Name
Class
Date
1.
Which of the following substances can sterilize
a)
Silver nitrate
b)
Cetylpyridinium cloride
c)
Ethylene oxide
d)
Alcohol
2.
Which of the following methods of infection control requires an autoclave?
a)
Irradiation
b)
Disinfection
c)
Sterilisation
d)
Sanitisation
3.
Hot air oven can be used to sterilize
a)
Petri dishes
b)
Plastic IV bags
c)
IV solution
d)
Rubber gloves
4.
identify the term that is used to ensure the surgical intruments are free from any microorganisms
a)
disinfection
b)
cleaned
c)
debrided
d)
sterilization
5.
disinfectants that act by disrupting microbial membrane
a)
heavy metals
b)
sterilizing agentscationic detergents
c)
metal detergents
d)
aldehydes
6.
which of thje following is most effective for sterilizing materesses?
a)
chlorine
b)
ethylene oxide
c)
autoclave
d)
gluteraldehyde
7.
first ever widely used antiseptic and disinfectant?
a)
phenol
b)
alcohol
c)
chlorine
d)
merthiolate
8.
which of the following does not kill bacterial endospores?
a)
hot air oven
b)
incineration
c)
pasteurisation
d)
autoclave
9.
three parameters of steam sterilization are
a)
pressure, time, concentration
b)
steam under pressure, time, temperature
c)
time temperature and concentration
d)
steam, time and temperature
10.
which of the following is best to sterilize heat labila solutions?
a)
dry heat
b)
autoclave
c)
membrane filteration
d)
pasteurization
11.
The time required to kill 90% of the microorganisms in a sample at a specific temperature is the
a)
decimal reduction time
b)
thermal death point
c)
F value
d)
D value
12.
Which of the following is not a disinfectant containing a heavy metal?
a)
A. Silver nitrate
b)
B. Mercurochrome
c)
C. Copper sulfate
d)
D. Chlorine
13.
Which is the most important surface active disinfectants?
a)
Amphoteric compounds
b)
Cationic compounds
c)
Non-ionic compounds
d)
Anionic compounds
14.
Which disinfectant would be most effective against Staphylococcus found in a blood spill?
a)
phenol
b)
Cetylpyridinium chloride
c)
Hexachlorophene
d)
None of these
15.
Preservation of foods by using salts and sugars works by
a)
raising pH
b)
lowering osmotic pressure
c)
creating a hypertonic environment
d)
creating a hypotonic environment
16.
Which disinfectant was the most effective against Salmonella"?
a)
alcohol
b)
Cetylpyridinium chloride
c)
Hexachlorophene
d)
Merthiolate
17.
If a canning procedure is not properly followed, which type of microbe is most likely to grow in the canned food?
a)
Obligate Aerobe
b)
Acidophile
c)
Mesophile
d)
Obligate Anaerobe
18.
Bactericidal concentration of phenol is
a)
0.0025
b)
0.005
c)
0.0075
d)
0.01
19.
Which of the following skin disinfectant(s) is/are most frequently used?
a)
A. Isopropyl alcohol
b)
Ethyl alcohol
c)
Both (a) and (b)
d)
none of these
20.
All of the following are sporicidal except
a)
glutaraldehyde
b)
ethylene oxide
c)
formaldehyde
d)
alcohol
21.
Media containing spores and thermolabile constituents are sterilized by
a)
A. pasteurization
b)
UV radiation
c)
dry heat
d)
tyndalization
22.
A(n)____is used to prevent infection by killing or inhibiting pathogen growth on animal tissues.
a)
bacteriostatic agent
b)
sanitizer
c)
disinfectant
d)
antiseptic
23.
Ethylene oxide is used to destroy or kill which of the following microbes?
a)
Bacteria
b)
Spores
c)
Fungi
d)
All of these
24.
Microbes can be removed from a liquid solution by the process of
a)
A. filtration
b)
freeze-drying
c)
osmosis
d)
desiccation
25.
Which of the following process can be efficiently carried out by incineration?
a)
A. Sterilization of scalpel blades and needles
b)
Sterilization of all glass syringes
c)
Sterilization of points of forceps
d)
Destruction of contaminated materials
26.
Which of the following material is sterilized by heating at 160°C in a hot air oven for one hour?
a)
Swab sticks
b)
All-glass syringes
c)
Oils and jellies
d)
All of these
27.
Which of the following is bactericidal?
a)
Membrane filtration
b)
Ionizing radiation
c)
Freeze-drying
d)
Deep freezing
28.
Which of the following is sterilized with the help of glutaraldehyde?
a)
Thermometer
b)
Bronchoscopes
c)
Cystoscopes
d)
all of the above
29.
Which of the following is a limitation of the autoclave?
a)
It takes too long to sterilize
b)
It lacks the ability to inactivate viruses
c)
It lacks the ability to kill endospores
d)
It will destroy heat labile materials
30.
Which of the following has most heat resistant spores?
a)
Clostridium histolyticum
b)
Clostridium perfringens
c)
Bacillus stearothermophilus
d)
bacillus cereus
31.
Steam exposure of a material less than 100°C for 20 minutes for three consecutive days is known as
a)
inspissation
b)
tyndallization
c)
autoclaving
d)
none
32.
Which of the following material is sterilized by use of red heat?
a)
Soiled dressings
b)
Inoculating wires and loops
c)
Glass slides
d)
All-glass syringes
33.
Which of the following methods will not sterilize?
a)
Aqueous glutaraldehyde for 10 hours
b)
Dry heat at 171°C for 1 to 2 hours
c)
121°C at 15 lb/in pressure for 15 to 20 minutes
d)
100°C boiling water for 30 minutes
34.
Which of the following is/are vapour-phase disinfectant/s?
a)
Formaldehyde
b)
ethylene oxide
c)
both a and b
d)
none
35.
Iodophores are mixture of
a)
iodine and aldehydes
b)
iodine and surface active agents C. iodine and alcohols D. iodine and phenols
c)
iodine and alcohols
d)
iodine and phenols
36.
Which of the following compounds are commonly used as general antiseptics to treat cuts and scratches?
a)
Aldehydes
b)
ethylene oxide
c)
halogens
d)
none
37.
The most suitable way of sterilization of oils and fats is:
a)
Pasteurization
b)
tyndallization
c)
hot air oven
d)
autoclaving
38.
Each of the following statements concerning the killing of bacteria is correct EXCEPT:
a)
The pasteurization of milk kills pathogens but allows many organisms and spores to survive.
b)
A 70% solution of ethanol kills more effectively than absolute (100%) ethanol.
c)
An autoclave uses steam under pressure to reach the killing temperature of 121°C. <br />
d)
Iodine kills by causing the formation of thymine dimers in bacterial DNA.
39.
Which of the following is used to disinfect surfaces and soak rubber equipment before sanitization?
a)
bleach
b)
boiling water
c)
iodine
d)
alcohol
40.
Which of the following is most resistant to antiseptics/sterilization:
a)
Bacterial Spore
b)
cyst
c)
fungus
d)
prions
41.
Which of the following is commonly used in the laboratory setting to provide a measure of protection against transmission of the human immunodeficiency virus (HIV)?
a)
bleach
b)
iodine
c)
hot air
d)
germicidal soap
42.
A disadvantage of gas sterilization is
a)
it takes up many hours to complete the process.
b)
it raises the temperature in the unit to 270 degrees F.
c)
the instruments must be placed in a small chamber.
d)
it uses ethylene oxide which is hazardous to humans and to the environment
43.
Any process that destroys the non-spore-forming contaminants on inanimate objects is:
a)
sterilization
b)
degermation
c)
antisepsis
d)
disinfection
44.
Sharp instruments should not be sterilized by:
a)
Hot air ovens
b)
boiling
c)
autoclaving
d)
chemical disinfectants
45.
Which is a form of cold sterilization
a)
gamma rays
b)
UV rays
c)
steam sterilization
d)
pasteuratization
46.
Which of the following scientist introduced the "Sterilization" technique?
a)
Louis Pasteur
b)
Robert Koch
c)
John Needham
d)
Joseph Lister
47.
The bowie dick test is now known as the
a)
Dynamic air removal test
b)
Diagnostic test
c)
Air challenge test
d)
Process challenge test
48.
Microbial kill in the ozone sterilizer is achieved through a process called
a)
Condensation
b)
alkylation
c)
oxidation
d)
cavitation
49.
cidex is
a)
formaldehyde
b)
gluteraldehyde
c)
phenol
d)
none of the above
50.
dettol is
a)
chlorhexidine
b)
chlorxylinol
c)
cholrien oxide
d)
none of the above
100 %
