Sterilization and Disinfection Practice Questions

Question 1

Which is false regarding Spaulding's criteria?

Accepted Answer

Semi critical items need low level disinfection

Answer

Non critical items require only decontamination

Answer

Cardiac catheters are examples of critical items

Answer

Semi critical items are those which come in contact with mucous membrane or non intact skin

Question 2

What is the preferred method for sterilizing disposable syringes?

Accepted Answer

Gas sterilization (Ethylene oxide)

Answer

Steam sterilization (Autoclave)

Answer

Chemical sterilization (Cidex)

Answer

Dry heat sterilization (Hot air oven)

Question 3

Heat-labile liquids are sterilized by?

Accepted Answer

Membrane filter

Answer

Hot air oven

Answer

Autoclaving

Answer

Moist heat

Question 4

Which of the following agents is both a disinfectant and an antiseptic?

Accepted Answer

Hydrogen peroxide

Answer

Sodium hypochlorite

Answer

Glutaraldehyde

Answer

Methylated spirit

Question 5

All of the sterilization methods are properly matched except?

Accepted Answer

Bronchoscope - Autoclaving

Answer

Culture media - Autoclaving

Answer

Glassware & syringes - Hot air oven

Answer

Catgut suture - Radiation

Question 6

What is the primary use of the freezing method in microbiology?

Accepted Answer

Preservation of microorganisms through freezing

Answer

Sterilization of heat-sensitive materials using freezing

Answer

Killing bacteria at high temperatures

Answer

Stimulating the growth of microorganisms

Question 7

Fibreoptic scopes are sterilized by

Accepted Answer

Glutaraldehyde

Answer

Ethylene oxide

Answer

Alcohol

Answer

Autoclaving

Question 8

Which agent is used for the sterilization of a cystoscope?

Accepted Answer

Glutaraldehyde

Answer

Formaldehyde

Answer

Isopropyl alcohol

Answer

Ethylene oxide

Question 9

Which of the following events occurs during the stationary phase of the bacterial growth curve?

Accepted Answer

Sporulation

Answer

Bacterial cell number increases

Answer

Bacterial cell size decreases

Answer

Bacterial cell size increases

Question 10

Why was it advised to use agar instead of gelatin for solidifying culture media for bacterial cultivation?

Accepted Answer

Gelatin melts at 37°C.

Answer

Agar provides more nutrients.

Answer

Gelatin is not easily available.

Answer

Agar is cheaper.

Sterilization and Disinfection — MCQs

Sterilization and Disinfection — MCQs

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