Question 1

Among this list of organisms, the most resistant are:

Accepted Answer

Prions are the most resistant because they are not affected by heat, radiation, or chemicals.

Question 2

Intermediate level disinfectants include the following except:

Accepted Answer

The answer of Intermediate level disinfectants include the following except:
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Question 3

All of the following are disinfectants except:

Accepted Answer

Iodine is primarily used as an antiseptic for skin disinfection, not as a disinfectant for surfaces or equipment.

Question 4

Phenols Mechanism of action:

Accepted Answer

The answer of Phenols Mechanism of action:
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Question 5

Alcohol concentration as antiseptic is:

Accepted Answer

60-70% ethyl alcohol is the most effective concentration for use as an antiseptic because it denatures proteins and disrupts cell membranes, effectively killing microorganisms.

Question 6

Alcohols mechanism of action:

Accepted Answer

The answer of Alcohols mechanism of action:
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Question 7

Act by Oxidizing the cell membrane of microorganism:

Accepted Answer

Hydrogen peroxide acts by oxidizing the cell membrane of microorganisms, leading to their destruction.

Question 8

Intermediate to high level disinfectant are all of the following except:

Accepted Answer

The answer of Intermediate to high level disinfectant are all...

Question 9

Uses of chlorine releasing agents:

Accepted Answer

Chlorine releasing agents are used for disinfection of water, as environmental disinfectants, and as household bleach, making all the options correct.

Question 10

Used for surgical hand scrub:

Accepted Answer

Iodine is used as a surgical hand scrub because it is a powerful antiseptic that kills bacteria and other microorganisms.

Question 11

Savon and cetrimide:

Accepted Answer

Savon and cetrimide are both quaternary ammonium compounds (QAC), which are used as disinfectants and antiseptics.

Question 12

QAC are:

Accepted Answer

Quaternary ammonium compounds (QACs) are considered low-level disinfectants, effective against most vegetative bacteria and enveloped viruses but not effective against spores or non-enveloped viruses.

Question 13

Used for disinfection (Fumigation) of operating rooms:

Accepted Answer

Formaldehyde is used for disinfection (fumigation) of operating rooms because it is a potent antimicrobial agent that can kill bacteria, viruses, and fungi.

Question 14

Used for toxoid Preparation:

Accepted Answer

Formaldehyde is used to inactivate toxins to create toxoids, which are used in vaccines to elicit an immune response without causing disease.

Question 15

All of the following can be used in the process of chemical sterilization except:

Accepted Answer

Quaternary ammonium compounds (QAC) are not typically used for sterilization; they are more commonly used as disinfectants.

Question 16

Tyndallization is the process of sterilization in Koch's steamer which is achieved on:

Accepted Answer

Tyndallization is a method of sterilization that involves heating the material on three successive days to kill both vegetative cells and spores.

Question 17

Sugar media are sterilized through the process of:

Accepted Answer

Tyndalization is a method used to sterilize sugar media because it involves intermittent boiling, which prevents the caramelization of sugars that can occur with high-temperature methods like autoclaving.

Question 18

Sterilization of serum is done by the process of:

Accepted Answer

Serum is sterilized by filtration because it is a heat-sensitive material, and filtration allows for the removal of microorganisms without altering the serum's properties.

Quiz 1: Sterilization