Infection Prevention and Control: cleaning, disinfection, and sterilization Free MCQs
These 50 MCQs cover a comprehensive range of topics related to infection prevention and control, specifically focusing on cleaning, disinfection, sterilization, and healthcare-specific infection control measures.
Infection Prevention and Control: Cleaning, Disinfection, and Sterilization
1. Basic Concepts of Infection Control
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What is the first step in infection control?
- a) Sterilization
- b) Cleaning
- c) Disinfection
- d) Isolation
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Which of the following is not a method of infection prevention?
- a) Hand hygiene
- b) Overuse of antibiotics
- c) Wearing personal protective equipment (PPE)
- d) Proper disposal of medical waste
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The most effective way to prevent the spread of infections in healthcare settings is:
- a) Wearing gloves all the time
- b) Frequent handwashing
- c) Avoiding patient contact
- d) Using strong disinfectants
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Nosocomial infections are:
- a) Infections acquired in the community
- b) Infections acquired in a healthcare setting
- c) Infections caused by poor diet
- d) Infections that cannot be treated with antibiotics
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The chain of infection includes:
- a) Coughing, sneezing, touching
- b) Reservoir, portal of exit, mode of transmission, portal of entry, susceptible host
- c) Antibiotics, vaccines, immune response
- d) Bacteria, viruses, fungi, parasites
2. Cleaning, Disinfection & Sterilization
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Cleaning is the process of:
- a) Removing visible dirt and organic matter
- b) Destroying all microorganisms
- c) Killing spores
- d) Applying high heat to instruments
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Disinfection eliminates:
- a) All microbes including spores
- b) Most pathogenic microorganisms except spores
- c) Only visible dirt
- d) None of the above
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Sterilization is the process of:
- a) Reducing the number of pathogens
- b) Eliminating all microorganisms, including spores
- c) Using alcohol-based solutions
- d) Washing with soap and water
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Which of the following is not an effective sterilization method?
- a) Autoclaving
- b) Boiling water
- c) UV light exposure
- d) Dry wiping
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Which of the following is a high-level disinfectant?
- a) Alcohol
- b) Chlorhexidine
- c) Glutaraldehyde
- d) Soap and water
3. Hand Hygiene & PPE
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How long should handwashing last according to WHO guidelines?
- a) 10 seconds
- b) 20 seconds
- c) 30 seconds
- d) 1 minute
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Alcohol-based hand rubs are effective against:
- a) All bacteria and viruses
- b) Most bacteria, fungi, and viruses
- c) Only bacterial spores
- d) Only fungal infections
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Which of the following must be worn for airborne precautions?
- a) Surgical mask
- b) N95 respirator
- c) Gloves only
- d) Face shield
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PPE should be removed in which order?
- a) Gloves, gown, mask, hand hygiene
- b) Gown, gloves, mask, hand hygiene
- c) Mask, gloves, gown, hand hygiene
- d) Gloves, mask, gown, hand hygiene
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Which PPE is most effective in preventing the spread of respiratory infections?
- a) Gloves
- b) Face shield
- c) N95 mask
- d) Gown
4. Disinfection of Equipment & Surfaces
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What is the recommended dilution of bleach for surface disinfection?
- a) 1:10
- b) 1:50
- c) 1:100
- d) 1:500
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High-touch surfaces in hospitals should be disinfected:
- a) Once a week
- b) Twice a week
- c) Daily or more frequently
- d) Only when visibly dirty
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What should be used to disinfect a blood spill?
- a) Soap and water
- b) Alcohol wipes
- c) 1:10 bleach solution
- d) Dry cloth
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What is the best method to clean an endoscope?
- a) Autoclaving
- b) High-level disinfection
- c) Soap and water
- d) UV light exposure
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Instruments that come in contact with mucous membranes require:
- a) Sterilization
- b) High-level disinfection
- c) Low-level disinfection
- d) No cleaning
5. Sterilization Techniques
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Which sterilization method is most commonly used for heat-sensitive instruments?
- a) Autoclaving
- b) Ethylene oxide gas
- c) Boiling water
- d) Alcohol disinfection
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Autoclaving is done at what temperature?
- a) 100°C
- b) 121°C
- c) 150°C
- d) 200°C
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The recommended pressure for autoclaving is:
- a) 5 psi
- b) 10 psi
- c) 15 psi
- d) 30 psi
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Dry heat sterilization is mainly used for:
- a) Rubber materials
- b) Heat-sensitive items
- c) Glassware and metal instruments
- d) Plastic items
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Chemical sterilization is preferred for:
- a) Surgical steel instruments
- b) Heat-sensitive instruments
- c) Bandages
- d) Needles
6. Healthcare Waste Management
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Red biohazard bags are used for:
- a) Sharps waste
- b) Infectious waste
- c) Pharmaceutical waste
- d) General trash
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Sharp objects (e.g., needles) should be disposed of in:
- a) Regular trash bags
- b) Sharps containers
- c) Biohazard bins
- d) Cardboard boxes
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Non-infectious general waste is disposed of in:
- a) Yellow bag
- b) Green bag
- c) Red bag
- d) Blue bag
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What is the correct method of disposing of expired medications?
- a) Flushing down the sink
- b) Incineration
- c) Throwing in regular trash
- d) Pouring into biohazard bags
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Which waste must be incinerated?
- a) Plastic bottles
- b) Used syringes
- c) Paper waste
- d) Food scraps
7. Infection Control in Special Situations
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In the event of an outbreak, which of the following is the most critical step?
- a) Isolating affected patients
- b) Increasing antibiotic usage
- c) Reducing visitor access
- d) Closing the hospital
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Which of the following is true about surgical asepsis?
- a) It involves cleaning and disinfecting surgical tools
- b) It ensures complete elimination of all microorganisms
- c) It is less critical than hand hygiene
- d) It requires no special equipment or precautions
-
Airborne precautions are required for which of the following infections?
- a) Influenza
- b) Tuberculosis
- c) Hepatitis
- d) Chickenpox
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Which of the following PPE is essential for caring for a patient with tuberculosis?
- a) Surgical mask
- b) N95 respirator
- c) Gloves only
- d) Gown and gloves
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Immunization helps prevent the spread of infections by:
- a) Killing pathogens directly
- b) Enhancing the immune system’s ability to fight specific pathogens
- c) Killing viral spores
- d) Increasing personal hygiene effectiveness
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Which type of isolation should be implemented for patients with a suspected or confirmed viral hemorrhagic fever (VHF)?
- a) Contact isolation
- b) Droplet isolation
- c) Airborne isolation
- d) Strict isolation
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Antibiotic resistance occurs when:
- a) Bacteria become stronger than viruses
- b) Antibiotics are overused or misused
- c) Disinfection practices are not followed
- d) Only specific bacterial strains are used in treatment
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Which of the following is a high-risk situation for the development of hospital-acquired infections (HAIs)?
- a) Routine outpatient visits
- b) Invasive procedures
- c) Adequate hand hygiene
- d) Using disposable medical equipment
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During an outbreak of a contagious disease, what is the primary role of infection control teams?
- a) Treating patients immediately
- b) Contact tracing and quarantine
- c) Ignoring non-infected patients
- d) Administering vaccines only
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The most effective way to prevent the spread of bloodborne pathogens in healthcare settings is:
- a) Wearing a mask
- b) Using appropriate PPE and safely handling needles
- c) Performing daily disinfection of surfaces
- d) Isolating all patients
8. Infection Control in High-Risk Environments
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When cleaning a hospital room after a patient with a Clostridium difficile infection, the most important step is:
- a) Using a high-level disinfectant
- b) Using soap and water for cleaning
- c) Using a bleach-based cleaner
- d) Changing the bed linens frequently
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Which surface should be disinfected first when cleaning a hospital room?
- a) The floor
- b) The high-touch surfaces (e.g., door handles, light switches)
- c) The patient’s bed
- d) The sink and toilet
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Which of the following should be done when cleaning instruments contaminated with blood or bodily fluids?
- a) Discard immediately after use
- b) Use soap and water before disinfecting
- c) Dry wipe to remove excess material
- d) Use UV light exposure for cleaning
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For infection control, linens should be handled by:
- a) Shaking them to remove debris
- b) Keeping them away from the body and placing them directly into laundry bags
- c) Wringing them out to remove excess moisture
- d) Folding them neatly before placing them in bags
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What is the first step when dealing with a contaminated spill in a healthcare setting?
- a) Use an alcohol-based hand rub
- b) Put on gloves and then clean up the spill
- c) Use a chemical sterilizer
- d) Dispose of contaminated materials in biohazard bags
9. Advanced Infection Control Practices
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Which of the following should be used to disinfect surgical instruments that will not be autoclaved?
- a) Alcohol-based disinfectant
- b) Glutaraldehyde or hydrogen peroxide-based solution
- c) Soap and water
- d) Chlorine bleach
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What is the role of ultraviolet (UV) light in infection control?
- a) It sterilizes surgical instruments
- b) It kills most microorganisms by disrupting their DNA
- c) It is used for cleaning surfaces of visible dirt
- d) It enhances the effects of disinfectants
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Which of the following is most likely to require an autoclaving procedure for sterilization?
- a) Wooden tongue depressors
- b) Surgical scalpel
- c) Disposable gloves
- d) Plastic aprons
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In an outbreak of multidrug-resistant organisms (MDROs), which infection control strategy is most important?
- a) Frequent handwashing
- b) Isolation of affected patients and contact precautions
- c) Administering broad-spectrum antibiotics
- d) Use of disposable surgical masks
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The primary method for preventing infections related to invasive devices such as catheters is:
- a) Regular cleaning of the skin around the insertion site
- b) Using antibiotic creams on the site
- c) Keeping the catheter in place as long as possible
- d) Ensuring proper hand hygiene and aseptic techniques during insertion
