Multiple Choice Questions Answers
1. Identify which of the following aspects is unlikely to be an outcome of high standards
of hygiene when working with animals:
A Reduction of pathogen build-up
B Reduction in the chance of disease transmission
C Reduction in the cost of substrates [True]
D Reduction in the cost of veterinary fees
The correct answer is C. High standards of hygiene are likely to reduce all other factors
listed but are unlikely to reduce the costs of substrate/bedding.
2. Identify the correct definition of an antiseptic:
A Chemicals that kill or prevent infection and damage living tissues
B Chemicals that kill or prevent infection without damaging living tissues [True]
C Chemicals that can only kill or prevent infection on non-living tissues
D Chemicals that can only kill or prevent infection on animal housing
The correct answer is C. Antiseptics are designed for use on the skin and are used to kill
or prevent micro-organisms that may cause infection. Disinfectants are designed for use
on hard surfaces, equipment and instruments.
3. Identify the correct definition of a disinfectant:
A Chemicals that kill or prevent infection and damage living tissues [True]
B Chemicals that kill or prevent infection without damaging living tissues
The correct answer is A. Disinfectants are chemicals designed for use on hard surfaces,
equipment and instruments as they are usually too toxic to be used on living tissues.
4. Identify the term that describes an environment completely free of microorganisms:
A Antibiotic
B Asepsis [True]
C Antisepsis
The correct answer is B. Asepsis is the state of being completely free of microorganisms.
5. Identify the term that describes a disinfectant that can kill bacteria:
A Bactericidal [True]
B Bacteriostatic
C Pathogenic
D Bacteriosis
The correct answer is A. A disinfectant that kills bacteria is described as being
bactericidal.
6. Identify the term that is used to ensure surgical instruments are free from
micro-organisms:
A Disinfected
B Cleaned
C Debrided
D Sterilization [True]
The correct answer is D. Surgical instruments must have been sterilized prior to use
otherwise it cannot be guaranteed that they are free of micro-organisms and therefore
there is a risk of infection being introduced into the animal.
7. Identify the term that can describe a disinfectant that can inhibit the growth
of fungi:
A Fungicidal
B Fungisepsis
C Fungistatic [True]
D Fungigenic
The correct answer is C. A disinfectant that inhibits the growth of fungal organisms is
described as being fungistatic.
http://www.indiabix.com/microbiology/physical-and-chemical-agents/
NO ANSWERS
Monday, 13 May 2013
mcq on sterilization and disinfect.
1) Lysol is a
a) Sterilent
d) Antifungal agent
b) Disinfectant
c) Antiseptic
2) The technique used to avoid all microorganisms is accomplished by
a) Sterlization
b) Disinfection
c) Surgical sterilization
d) Disinfection Sterilization
3) Thermal death time is
a) Time required to kill all cells at a given temperature
b) Temperature that kills all cells in a given time
c) Time and temperature needed to kill all cells
d) All of the above
4) Temperature required for pasteurization is
a) Above 150oC
b) Below 100oC
None
5) Temperature in pasteurization is
a) 62.8oC
b) 35.7oC
c) 110oC
d)
c) 68.2oC
6) By pasteurization
a) All the microorganisms can be removed
removed
c) Only spores
d) None
d) 60.8oC
b) Only pathogenic forms can be
7) Which of the following method of sterilization has no effect on spores?
a) Drying
b) Hot air oven
c) Autoclave
these
8) Autoclaving is carried at
a) Dry heat
d) All of these
b) Atmospheric pressure
9) The condition required for autoclave
a) 121oC temp.and 15 lbs. pressure for 20 min.
b) 120oC temp.and 20 lbs. pressure for 30 min
c) 150oC temp.for 1 hr.
d) 130oC temp for 2 hr.
10) Lyophilization means
a) Sterilization
b) Freeze-drying
c) Burning to ashes
d) Exposure to formation
11) Temperature used for hot air oven is
a) 100oC for 1 hour
b) 120oC for 1 hour
o
c) 160 C for 1 hour
d) 60oC for 1 hour
c) 120oC
d) None of
12) Phenol co-efficient indicates
a) Efficiency of a disinfectant
c) Purity of a disinfectant
13) Spores are killed by
a)70% alcohol
c) Autoclaving
14) Glassware are sterilized by
a) Autoclaving
None of these
b) Dilution of a disinfectant
d) Quantity of a disinfectant
b) Glutaraldehyde
d ) Both b and c
b) Hot air over
c) Incineration
15) The lowest temperature that kills all microorganisms in a liquid suspension in 10 minutes is known as the
a)Decimal reduction time
b)Thermal death point.
c)Thermal death temperature.
d)Thermal death time.
16) 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)Thermal death temperature.
d)D value.
17) The time in minutes at a specific temperature needed to kill a population of cells is the
a) Decimal reduction time.
b)Thermal death point.
c)Thermal death temperature.
d)
d)F- value.
18) Which of the following is most effective for sterilizing mattresses and plastic Petri plates?
a)Chlorine
b)Ethylene oxide
c) Glutaraldehyde
d) Autoclave
30
INCORRECT
19) Aldehydes, which are most powerful disinfectants
a) Formaldehyde
b) Acetaldehyde
Both a and c
c) Glutamal aldehyde
20)Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have
a)
Insufficient nutrients.
b)
Low pH.
c)
High concentration of solutes.
d)
Toxic alkaline chemicals.
21) All of the following are used in Kelsey-Sykes test except,
a) Staphylococcus aureus
b) Escherichia coli
c) Pseudomonas aeruginosa
d) Shigella
22) Which one the following is best test to know the activity of an unknown disinfectant?
a) MIC test
b) Rideal Walker test
c) Chick Martin test
d) in use test of Maurer
d)
23) Which of the following is best to sterilized heat labile (heat unstable)
solution.
a) Dry heat
b)
Autoclave
c) Membrane filtration
d) Pasteurization
24) Which of the following is bactericidal (lethal to bacteria).
a) Membrane filtration
b)
Ionizing radiation
c) Deep freezing
d) All of the above
25) The typical termperature for an autoclave (operating at 15pounds per square inch of pressure)
is
a) 121oC
b)100oC
c)63oC
d)73oC
26) Phenol co-efficient indicates
a) Efficiency of a disinfectant
b) Dilution of a disinfectant
c) Purity of a disinfectant
d) Quantity of a disinfectan
https://www.health.qld.gov.au/EndoscopeReprocessing/flash/252.asp
https://books.google.com.sa/books?
id=VD7XjFU64DIC&pg=PA143&lpg=PA143&dq=Disinfectants+MCQs+Answers&sou
rce=bl&ots=4BVxfVGC78&sig=vZahEHKVNAjq6uyXhwAD9RCefXI&hl=en&sa=X&ve
d=0CDYQ6AEwBGoVChMIwfSPo4q3xwIVhLwUCh1DkwTa#v=onepage&q=Disinfecta
nts%20MCQs%20Answers&f=false
http://mcqs.leedsmedics.org.uk/Year%203/PatEval/Sterilization%20and
%20disinfectionMC.html
https://books.google.com.sa/books?
id=g42fbO0xrg0C&pg=PA65&lpg=PA65&dq=Disinfectants+MCQs+Answers&source
=bl&ots=Qft6wZ_JG&sig=q4RXx0122BBOouBAdjTo0xG__Sk&hl=en&sa=X&ved=0CEcQ6AEwCG
oVChMIwfSPo4q3xwIVhLwUCh1DkwTa#v=onepage&q=Disinfectants%20MCQs
%20Answers&f=false
