Question 1

All the following are correct about detergents, except

Accepted Answer

The answer of All the following are correct about detergents,...

Question 2

Which of the following is being used to replace hypochlorites in treating water because of the possibility of cancer-causing substances being produced?

Accepted Answer

The answer of Which of the following is being used...

Question 3

Which of the following does not contain a heavy metal?

Accepted Answer

Tincture of iodine does not contain a heavy metal; it primarily contains iodine, which is a halogen, not a heavy metal.

Question 4

The chemical agents) that produces highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is/ are

Accepted Answer

Hydrogen peroxide is a chemical agent that produces highly reactive hydroxyl-free radicals and decomposes to oxygen and water vapor. The other options do not have this property.

Question 5

Which of the following is not used as an antiseptic?

Accepted Answer

Aqueous glutaraldehyde is primarily used as a high-level disinfectant and sterilant in medical environments, not as an antiseptic. Antiseptics are used on living tissues to reduce the possibility of infection, whereas disinfectants and sterilants like glutaraldehyde are used on non-living surfaces.

Question 6

The easiest microbial forms to kill or inhibit are

Accepted Answer

Vegetative bacteria and fungi are the easiest microbial forms to kill or inhibit. They do not have the protective structures found in endospores or the cysts of protozoa, and they are not as resistant as Mycobacterium and Staphylococcus. Naked viruses are not technically living organisms, and they can be difficult to target with traditional antimicrobial agents.

Question 7

The sterilizing gas used in a special chamber is

Accepted Answer

Ethylene oxide is a highly effective sterilizing gas that can penetrate through packaging and reaches areas that traditional sterilization methods may not be able to access. It is commonly used to sterilize medical equipment and supplies. Iodophor and glutaraldehyde are liquid disinfectants, while formaldehyde is a gas that is highly toxic and not commonly used for sterilization. Chlorine dioxide is primarily used for decontamination and disinfection of surfaces, but not necessarily for sterilization.

Question 8

All of the following are benefits of food irradiation, except

Accepted Answer

Food irradiation does not make the food less nutritious, in fact, it can help preserve the nutrient content of the food by reducing spoilage and extending shelf life.

Question 9

Which is mismatched?

Accepted Answer

Chlorhexidine is not an alcohol, it is a chlorinated antiseptic. Therefore, the mismatch is between chlorhexidine and alcohol.

Question 10

Alcohols

Accepted Answer

All of the choices listed are correct statements about alcohols.

Question 11

Which of the following is officially accepted as a sterilant and high-level disinfectant?

Accepted Answer

Glutaraldehyde is officially accepted as a sterilant and high-level disinfectant by regulatory agencies such as the US Environmental Protection Agency (EPA) and the Centers for Disease Control and Prevention (CDC). Benzalkonium chloride and triclosan are considered low-level disinfectants, while silver nitrate and cresol are not typically used as disinfectants in healthcare settings.

Question 12

All of the following pertain to hypochlorites, except

Accepted Answer

Hypochlorites are not found in iodophors. Iodophors are a combination of iodine and a solubilizing agent, typically a detergent or wetting agent, used as disinfectants or antiseptics. Hypochlorites, on the other hand, are compounds that release hypochlorous acid in solution and are commonly used as disinfectants, including in household bleach and for disinfecting equipment in various industries.

Question 13

The compound that is an organic base containing chlorine and two phenolic rings and is used increasingly for hand scrubbing, neonatal washes, wound degerming, and prepping surgical skin sites is

Accepted Answer

The compound described fits the description of chlorhexidine, which is an organic base containing chlorine and two phenolic rings. Chlorhexidine is commonly used for hand scrubbing, neonatal washes, wound degerming, and prepping surgical skin sites. A, C, D, and E are incorrect choices.

Question 14

All of the following are phenols or phenolics, except

Accepted Answer

Chloramines are not phenols or phenolics. They are a group of compounds that contain chlorine and ammonia, often used as disinfectants or sanitizers.

Question 15

All of the following are correct about iodophors, except

Accepted Answer

The answer of All of the following are correct about...

Question 16

Iodophors include

Accepted Answer

Iodophors are iodine-based disinfectants that release iodine slowly and are less irritating than tincture of iodine. Povidone iodine is an iodophor commonly used as a skin disinfectant before surgery or other invasive procedures. Chloramines, alcohols, and chlorhexidine are not iodophors. Tincture of iodine is an iodine solution and not an iodophor.

Question 17

Which control method would not be a suitable choice for killing Mycobacteria in a capped culture tube?

Accepted Answer

Ultraviolet (germicidal) light is not effective for killing Mycobacteria in a capped culture tube because UV light does not penetrate glass or other opaque materials, thus it cannot reach and kill the bacteria inside a capped tube.

Question 18

Which of the following chemicals is a disinfectant for soft contact lenses?

Accepted Answer

Hydrogen peroxide is a common disinfectant for soft contact lenses. It is effective in killing bacteria and viruses, and it acts as a preservative by breaking down into water and oxygen. Alcohol, hexachlorophene, glutaraldehyde, and hypochlorites are not typically used as disinfectants for soft contact lenses.

Question 19

All of the following are correct about food irradiation, except

Accepted Answer

The World Health Organization does endorse the process of food irradiation as a safe and effective means of reducing the risk of foodborne illness and extending shelf life. Therefore, all other statements are correct regarding food irradiation.

Question 20

Ethylene oxide is

Accepted Answer

Ethylene oxide is sporicidal, meaning it is effective in killing bacterial spores which can be highly resistant to other sterilization methods.

Quiz 11: Physical and Chemical Agents for Microbial Control