Sterilization and Disinfection — MCQs

Q: Gamma radiations are used for sterilizing:

Syringes. ***Syringes*** - Gamma radiation sterilization is ideal for items that are sensitive to **heat** or **moisture**, like disposable plastic syringes. - This method ensures deep penetration and effective killing of microorganisms without damaging the integrity of the plastic materials. *Endoscopes* - Endoscopes are typically sterilized using **liquid chemical sterilants** (e.g., glutaraldehyde, peracetic acid) or **low-temperature sterilization methods** due to their delicate optical and electronic components. - Gamma radiation can **damage the optical fibers and delicate electronics** of endoscopes. *Surgical drapes* - Surgical drapes, especially those made of fabrics, are commonly sterilized by **steam sterilization (autoclaving)** due to its cost-effectiveness and efficacy for heat-resistant materials. - While gamma radiation could sterilize them, it is not the primary or most economical method for fabric drapes. *Metal instruments* - Metal instruments are typically sterilized using **steam sterilization (autoclaving)** due to their heat resistance and the method's effectiveness and cost-efficiency. - Gamma radiation is effective but generally reserved for heat-sensitive items not suitable for steam.

Q: The color code of plastic bag for disposing microbial laboratory culture waste is:

Yellow. ***Correct Option: Yellow*** - **Yellow bags/containers** are specifically designated for **infectious waste including microbial laboratory cultures, stocks or specimens of microorganisms, live or attenuated vaccines, and human and animal cell cultures** as per **Indian Biomedical Waste Management Rules (2016, amended 2018-2019)**. - Category 4 (Yellow) explicitly covers **waste generated from laboratory and microbiology cultures** requiring treatment through autoclaving/microwaving/hydroclaving followed by shredding or mutilation before disposal. - This ensures proper **disinfection and safe disposal** of potentially infectious laboratory waste. *Incorrect Option: Red* - **Red bags** are used for **contaminated (recyclable) waste** such as tubing, catheters, intravenous sets, and other items contaminated with blood or body fluids. - They are meant for **recyclable** plastic waste after proper disinfection, not for laboratory cultures requiring destruction. *Incorrect Option: Black* - **Black bags** are used for **general non-hazardous, non-recyclable solid waste** such as kitchen waste and housekeeping waste. - They are not suitable for infectious or biohazardous waste disposal. *Incorrect Option: Blue* - **Blue bags** are used for **glassware and metallic body implants** in some classification systems. - They are not designated for microbial culture waste disposal according to Indian BMW Rules.

Practice by Chapter

Physical Methods of Sterilization

Practice Questions

Chemical Methods of Sterilization

Practice Questions

Disinfectants and Antiseptics

Practice Questions

Sterilization Monitoring

Practice Questions

Hospital Sterilization Protocols

Practice Questions

Surgical Instruments Sterilization

Practice Questions

Endoscope Reprocessing

Practice Questions

Biological Indicators

Practice Questions

Factors Affecting Sterilization

Practice Questions

Quality Control in Sterilization

Practice Questions

Biofilm and Its Implications

Practice Questions

Regulatory Aspects of Sterilization

Practice Questions

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