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JBA Written Exam practice questions

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Question 1Biosafety and Facility Management

Under the JBA written exam's biosafety framework, which biosafety level is defined by work with agents of moderate potential hazard to personnel and the environment, typically using a Class II biological safety cabinet for aerosol-generating procedures?

  1. BSL-3
  2. BSL-2 Correct answer.
  3. BSL-1
  4. BSL-4

Explanation

BSL-2 applies to agents of moderate hazard where routine work uses standard precautions and aerosol-generating manipulations are performed in a Class II biological safety cabinet. BSL-1 covers low-risk agents with open bench work, while BSL-3 and BSL-4 add directional airflow, controlled access, and higher containment for serious or lethal agents.

Question 2Biosafety and Facility Management

A laboratory at BSL-2 handles specimens that may contain a bloodborne pathogen. Which practice is required at this containment level for routine processing of the samples?

  1. Performing all work inside a Class III glovebox
  2. Wearing a full-body positive-pressure suit during all manipulations
  3. Sterilizing the entire room with formaldehyde vapor after each shift
  4. Using standard precautions with gloves, lab coats, and face protection as indicated Correct answer.

Explanation

BSL-2 relies on standard precautions: gloves, gowns or lab coats, and eye or face protection when splashes are anticipated, plus handwashing and decontamination of surfaces. Full-body positive-pressure suits and Class III gloveboxes belong to BSL-4, and room-wide formaldehyde fumigation is not a routine shift-end practice.

Question 3Biosafety and Facility Management

Which document serves as the primary international reference for classifying biological agents by risk group and describing containment levels for laboratory work?

  1. The ISO 15189 standard
  2. The WHO Laboratory Biosafety Manual Correct answer.
  3. The Nagoya Protocol
  4. The OSHA Bloodborne Pathogens Standard

Explanation

The WHO Laboratory Biosafety Manual provides the international framework for risk group classification and containment levels, and it is widely adopted by national authorities. ISO 15189 addresses medical laboratory quality, OSHA regulates occupational exposure in the United States, and the Nagoya Protocol governs access and benefit-sharing for genetic resources.

Question 4Biosafety and Facility Management

A Class II biological safety cabinet is being selected for work with a non-volatile biological agent. Which statement correctly describes how this cabinet protects the operator and the sample?

  1. It provides both operator and product protection through inward airflow and HEPA-filtered supply air Correct answer.
  2. It provides protection only when the room is kept at positive pressure
  3. It protects the sample only and offers no operator protection
  4. It protects the operator only and offers no sample protection

Explanation

A Class II cabinet draws room air inward to protect the operator, passes supply air through a HEPA filter to protect the product, and exhausts HEPA-filtered air. Class I cabinets protect the operator and environment but not the sample, and room pressure does not substitute for cabinet airflow design.

Question 5Biosafety and Facility Management

Which action is the single most effective routine practice for reducing transmission of infectious agents on hands in the laboratory?

  1. Applying alcohol-based hand rub over visibly soiled hands
  2. Relying on ultraviolet room lights to sanitize hands
  3. Washing hands with soap and water, especially when visibly contaminated Correct answer.
  4. Wearing the same gloves for an entire shift

Explanation

Hand hygiene with soap and water is the primary measure for removing transient flora, and it is required when hands are visibly soiled or after contact with spore-forming organisms. Alcohol rubs are a supplement for non-soiled hands, gloves must be changed between tasks, and UV room lights do not sanitize skin.

Question 6Biosafety and Facility Management

Which statement best describes the purpose of a biological safety cabinet certification performed at installation and annually thereafter?

  1. It confirms the cabinet's electrical grounding only
  2. It measures the room's humidity and temperature
  3. It validates the autoclave's sterilization cycles
  4. It verifies that the cabinet's airflow and HEPA filter integrity meet performance specifications Correct answer.

Explanation

Certification tests airflow velocity, inflow, and HEPA filter integrity to confirm the cabinet performs to specification, and it is repeated after moves or repairs. Electrical grounding, room climate, and autoclave validation are separate activities outside cabinet certification.

Question 7Biosafety and Facility Management

In a BSL-3 laboratory, which design feature is used to ensure that air flows from clean areas toward contaminated areas when the door is opened?

  1. Air supply from the corridor into the laboratory only
  2. Positive pressure relative to the corridor
  3. Negative pressure relative to the corridor with directional airflow Correct answer.
  4. Neutral pressure with no airflow differential

Explanation

BSL-3 rooms are held at negative pressure relative to adjacent clean spaces so air flows inward, preventing contaminated air from escaping into corridors. Positive or neutral pressure would allow air to flow outward, defeating containment.

Question 8Biosafety and Facility Management

Which waste stream must be decontaminated by autoclaving before disposal when it contains viable biological agents?

  1. Broken glassware only
  2. Unopened reagent bottles past their expiry date
  3. Solid and liquid infectious laboratory waste Correct answer.
  4. Sharps placed in puncture-resistant containers

Explanation

Infectious solid and liquid waste must be rendered non-infectious, typically by validated autoclaving, before disposal. Sharps go into puncture-resistant containers for appropriate treatment, broken glass is handled as sharps or broken-glass waste, and expired reagents are chemical waste handled separately.

Question 9Biosafety and Facility Management

A researcher needs to work with a Risk Group 3 agent that is transmitted by the inhalation route. Which containment level and primary engineering control are most appropriate?

  1. BSL-2 with an open bench and no cabinet
  2. BSL-1 with standard precautions only
  3. BSL-3 with a Class II biological safety cabinet and directional airflow Correct answer.
  4. BSL-2 with a Class I cabinet and positive room pressure

Explanation

Inhalation-transmitted Risk Group 3 agents require BSL-3 containment, including a Class II cabinet for manipulations and negative-pressure directional airflow. BSL-1 and BSL-2 are insufficient for inhalation risk, and positive room pressure would compromise containment.

Question 10Biosafety and Facility Management

A spill of infectious material occurs inside a Class II biological safety cabinet while it is running. What is the correct immediate action?

  1. Evacuate the building and wait 24 hours before re-entry
  2. Turn off the cabinet and open the sash fully to ventilate
  3. Leave the cabinet running, allow aerosols to settle, then decontaminate surfaces with an appropriate disinfectant Correct answer.
  4. Spray the spill with water and wipe with a dry paper towel

Explanation

The cabinet should remain operating so that aerosols continue to be captured, and after a settling period the surfaces are decontaminated with a suitable disinfectant. Turning off the cabinet or opening the sash releases contaminated air, and water alone does not inactivate agents.

Question 11Biosafety and Facility Management

Which statement correctly distinguishes sterilization from disinfection?

  1. Sterilization kills all microorganisms including bacterial spores, whereas disinfection reduces or eliminates many pathogens but may not kill spores Correct answer.
  2. Sterilization and disinfection are interchangeable terms for the same process
  3. Disinfection kills all microorganisms including spores, whereas sterilization only reduces bioburden
  4. Sterilization applies only to surfaces, while disinfection applies only to instruments

Explanation

Sterilization is a validated process that destroys all microbial life, including spores, while disinfection reduces pathogenic organisms but generally spares spores depending on the agent used. The two terms are not interchangeable, and both can apply to surfaces and instruments depending on context.

Question 12Biosafety and Facility Management

A laboratory is designing a BSL-2 facility. Which combination of features is most consistent with BSL-2 design requirements?

  1. Double-door airlock, HEPA-filtered exhaust, and sealed room
  2. Self-closing doors, handwashing sink, and surfaces that are easily cleaned and decontaminated Correct answer.
  3. Open bench with carpeted floors and fabric-covered chairs
  4. Positive-pressure room with no handwashing sink

Explanation

BSL-2 design emphasizes self-closing doors, an accessible handwashing sink, and impervious, easily cleaned surfaces. Airlocks, HEPA-filtered exhaust, and sealed rooms are BSL-3 or BSL-4 features, and carpet or fabric is unsuitable because it cannot be reliably decontaminated.

Question 13Biosafety and Facility Management

Which practice is appropriate for the safe use of a centrifuge when processing potentially infectious samples?

  1. Balancing tubes only when the load exceeds 50 grams
  2. Leaving the lid open to observe samples during the run
  3. Using sealed safety cups or rotors and inspecting tubes for cracks before loading Correct answer.
  4. Opening the centrifuge immediately after the rotor stops to save time

Explanation

Sealed safety cups or rotors contain aerosols if a tube breaks, and tubes should be inspected for cracks before use. Tubes must always be balanced, the lid must remain closed during operation, and a settling period before opening reduces aerosol exposure.

Question 14Biosafety and Facility Management

A laboratory worker sustains a needlestick with a device contaminated with blood. Which sequence reflects appropriate post-exposure management?

  1. Cover the wound and complete the shift before notifying a supervisor
  2. Wait for symptoms to appear before reporting
  3. Apply bleach directly to the wound and continue working
  4. Wash the wound, report immediately, and seek prompt medical evaluation for post-exposure prophylaxis Correct answer.

Explanation

Post-exposure management begins with washing the wound, immediate reporting, and prompt medical evaluation to assess PEP, such as HIV prophylaxis, and baseline testing. Applying bleach to tissue is harmful, and delaying reporting or evaluation can compromise the effectiveness of prophylaxis.

Question 15Biosafety and Facility Management

Which statement accurately describes the role of the Institutional Biosafety Committee (IBC) in a research facility?

  1. It reviews and approves research involving recombinant DNA and infectious agents and oversees biosafety compliance Correct answer.
  2. It inspects restaurants and food-handling establishments
  3. It sets national building codes for hospital construction
  4. It licenses clinical laboratories to perform diagnostic testing

Explanation

The IBC reviews research protocols involving recombinant DNA and infectious agents, assesses risk, and oversees compliance with biosafety requirements. Laboratory licensure, food-safety inspection, and building codes fall under other regulatory bodies.

Question 16Biosafety and Facility Management

Which statement about the use of personal protective equipment in the laboratory is correct?

  1. Gloves may be worn into hallways and elevators
  2. PPE is the last line of defense and must be removed carefully to avoid self-contamination Correct answer.
  3. PPE is removed in the laboratory before exiting to reduce contamination spread
  4. PPE is the primary barrier and replaces engineering controls

Explanation

PPE is the last line of defense in the hierarchy of controls and must be removed in a manner that avoids contaminating the wearer or environment. Engineering controls remain primary, and wearing PPE outside the laboratory spreads contamination.

Question 17Biosafety and Facility Management

A new disinfectant is being evaluated for use against a non-enveloped virus on laboratory surfaces. Which property is most important to verify?

  1. The product's shelf life after dilution only
  2. The manufacturer's label claim and contact time for that organism category Correct answer.
  3. The product's ability to remove visible stains
  4. The product's fragrance and color

Explanation

Efficacy depends on the label claim for the relevant organism class and the required contact time, since non-enveloped viruses are generally more resistant than enveloped ones. Fragrance, color, and stain removal do not indicate antimicrobial efficacy.

Question 18Biosafety and Facility Management

Which statement best explains why HEPA filters are used in biological safety cabinets and in BSL-3 exhaust systems?

  1. They remove particles of about 0.3 micrometers with high efficiency, capturing aerosols that may carry infectious agents Correct answer.
  2. They kill microorganisms by heating the air stream
  3. They remove all gases and vapors from the air stream
  4. They add humidity to prevent static electricity

Explanation

HEPA filters are rated to remove at least 99.97 percent of particles around 0.3 micrometers, which captures most aerosolized infectious agents. They do not remove gases or vapors, do not heat-kill organisms, and are not humidifiers.

Question 19Biosafety and Facility Management

A laboratory plans to move a certified Class II biological safety cabinet to a new room. Which action is required before it is used again?

  1. Replace the HEPA filters regardless of condition
  2. Only clean the exterior surfaces with disinfectant
  3. Recertify the cabinet after installation in the new location Correct answer.
  4. No action is needed because certification is valid for the cabinet's lifetime

Explanation

Cabinet performance can be altered by relocation, so certification must be repeated after installation in a new location. Certification is not lifetime-valid, surface cleaning alone does not verify airflow, and filter replacement is not automatically required for every move.

Question 20Biosafety and Facility Management

Which statement correctly describes the hierarchy of controls as applied to laboratory biosafety?

  1. Elimination is never feasible, so engineering controls are the first choice
  2. Administrative controls are always more effective than engineering controls
  3. Elimination and substitution are preferred, followed by engineering controls, administrative controls, and PPE Correct answer.
  4. PPE is preferred because it is the least expensive control

Explanation

The hierarchy of controls ranks elimination and substitution highest, followed by engineering controls, administrative controls, and PPE as the last line of defense. PPE is not preferred on the basis of cost, and engineering controls generally outperform administrative measures.

Question 21Biosafety and Facility Management

A BSL-4 laboratory uses a positive-pressure suit laboratory. Which feature is essential to protect the worker in this configuration?

  1. The suit is supplied with HEPA-filtered breathing air and maintained at positive pressure relative to the room Correct answer.
  2. The suit is worn only during cleaning activities
  3. The room is kept at positive pressure relative to the suit
  4. The suit is sealed and the wearer breathes room air through a filter in the hood

Explanation

In a positive-pressure suit laboratory, the suit is supplied with HEPA-filtered air and kept at positive pressure so that any breach causes outward airflow, protecting the wearer. Breathing unfiltered room air, positive room pressure relative to the suit, or limited use during cleaning would defeat this protection.

Question 22Biosafety and Facility Management

An investigator plans work with a Risk Group 2 agent that is transmitted by the aerosol route during high-energy procedures. Which assessment outcome best justifies upgrading from standard BSL-2 to enhanced BSL-2 practices?

  1. The agent is well characterized and does not require any cabinet
  2. Aerosol generation increases inhalation exposure risk, so cabinet use, restricted access, and enhanced PPE are warranted Correct answer.
  3. The agent's risk group alone determines containment, so no procedural factors matter
  4. Upgrading is unnecessary because Risk Group 2 agents never cause laboratory-acquired infection

Explanation

Risk assessment considers procedure-generated aerosols, not just the agent's risk group, so high-energy aerosol-generating work may warrant enhanced BSL-2 measures such as cabinet use, restricted access, and enhanced PPE. Risk group alone does not capture procedural risk, and Risk Group 2 agents can cause laboratory-acquired infections.

Question 23Biosafety and Facility Management

A laboratory's autoclave is validated using biological indicators. Which statement best explains why biological indicators are preferred over chemical indicators for verifying sterilization efficacy?

  1. Chemical indicators are always more accurate than biological indicators
  2. Biological indicators contain highly resistant spores and directly demonstrate that the cycle kills microorganisms Correct answer.
  3. Chemical indicators prove sterility of every load without further testing
  4. Biological indicators change color faster than chemical indicators

Explanation

Biological indicators use highly resistant spores to demonstrate that the sterilization cycle actually kills microorganisms, providing direct evidence of efficacy. Chemical indicators reflect exposure conditions such as temperature or time but do not prove microbial kill.

Question 24Biosafety and Facility Management

A facility is evaluating whether to install a Class III biological safety cabinet for work with a Risk Group 4 agent. Which statement best reflects the rationale for this selection?

  1. A Class III cabinet is chosen because it is cheaper than a Class II cabinet
  2. A Class III cabinet is used only for non-infectious samples
  3. A Class III cabinet provides operator protection but no environmental protection
  4. A Class III cabinet is gas-tight and provides the highest level of primary containment for maximum-risk agents Correct answer.

Explanation

A Class III cabinet is a gas-tight glovebox that provides the highest level of primary containment for maximum-risk agents, protecting the operator, the product, and the environment. It is not chosen for cost, does not lack environmental protection, and is not limited to non-infectious work.

Question 25Biosafety and Facility Management

A laboratory reports a possible release of infectious aerosol into the corridor. Which sequence of actions best reflects an appropriate emergency response?

  1. Continue work while opening doors to dilute the aerosol
  2. Wait until the next scheduled safety inspection to report the incident
  3. Evacuate and restrict access, notify the biosafety officer, and decontaminate the area after the aerosol has been contained and cleared Correct answer.
  4. Clean the corridor with a dry mop immediately

Explanation

An aerosol release requires evacuation and access restriction, prompt notification of the biosafety officer, and decontamination only after the aerosol is contained and cleared. Continuing work, dry mopping, or delaying the report would spread contamination or prolong exposure.

Question 26Biosafety and Facility Management

A laboratory is being planned for work with a Risk Group 2 agent that is not transmitted by the aerosol route. According to the biosafety level criteria, which containment level is the minimum that should be selected for this work?

  1. BSL-1
  2. BSL-4
  3. BSL-3
  4. BSL-2 Correct answer.

Explanation

Risk Group 2 agents are associated with human disease of moderate severity and require BSL-2 containment as the minimum when the route of transmission is not aerosol. BSL-1 is reserved for agents not known to cause disease in healthy adults, while BSL-3 and BSL-4 are required for agents with higher risk or aerosol transmission.

Question 27Biosafety and Facility Management

A laboratory worker is about to use a Class II biological safety cabinet for work with a Risk Group 2 agent. Which action is most important to take immediately before starting work in the cabinet?

  1. Turn on the ultraviolet lamp for 30 minutes to sterilize the work surface.
  2. Adjust the room ventilation to a negative pressure relative to the corridor.
  3. Allow the cabinet to run for several minutes so that the air curtain stabilizes. Correct answer.
  4. Disinfect the outside of the cabinet with a phenolic solution.

Explanation

A Class II biological safety cabinet must be allowed to run so that airflow and the air curtain stabilize before materials are introduced; this ensures containment is established. Ultraviolet lamps are not a substitute for surface disinfection and are not used while work is in progress, and room pressure is a facility-level control that does not replace the cabinet's own airflow.

Question 28Biosafety and Facility Management

A laboratory is preparing a written spill response plan for a BSL-2 room. Which element is essential to include in the plan for responding to a spill of infectious material outside a biological safety cabinet?

  1. A requirement to neutralize the spill with a strong acid before disinfection.
  2. Instructions to evacuate the building immediately without notifying anyone.
  3. A procedure for covering the spill with absorbent material and applying an appropriate disinfectant. Correct answer.
  4. A directive to clean the spill with a dry mop before applying any liquid.

Explanation

A spill response plan should direct workers to contain the spill with absorbent material and apply a suitable disinfectant with the correct contact time. Evacuation without notification is unsafe and does not address the spill, and dry mopping or neutralizing with acid can aerosolize infectious material or create additional hazards.

Question 29Biosafety and Facility Management

A biosafety officer is reviewing the facility's autoclave use for decontaminating solid laboratory waste. Which loading practice is most appropriate to ensure effective sterilization?

  1. Seal all waste bags completely so that steam cannot enter.
  2. Pack the chamber tightly to maximize the amount of waste processed per cycle.
  3. Place the waste in closed, rigid containers that block steam contact.
  4. Arrange items to allow steam penetration and avoid overloading the chamber. Correct answer.

Explanation

Steam sterilization depends on direct contact between steam and all surfaces, so items must be arranged to allow steam penetration and the chamber must not be overloaded. Tight packing, sealed bags, and closed rigid containers prevent steam contact and can cause cycle failure.

Question 30Biosafety and Facility Management

A laboratory is designing a BSL-3 facility and must decide on the airflow relationship between the laboratory and adjacent corridors. Which design principle should be applied?

  1. The corridor should be at negative pressure relative to the laboratory to protect the corridor.
  2. The laboratory and corridor should be at equal pressure to simplify the HVAC system.
  3. The laboratory should be at positive pressure relative to the corridor to keep contaminants out.
  4. The laboratory should be at negative pressure relative to the corridor to contain airborne agents. Correct answer.

Explanation

BSL-3 laboratories are designed so that air flows from clean areas into the laboratory, which requires the laboratory to be at negative pressure relative to adjacent corridors. This directional airflow helps contain infectious aerosols within the laboratory space.

Question 31Biosafety and Facility Management

A laboratory worker must transport a specimen suspected of containing a Risk Group 3 agent from a BSL-3 laboratory to another building on the same campus. Which practice best reflects the applicable biosafety requirements?

  1. Use a triple-packaging system with absorbent material and a leakproof secondary container. Correct answer.
  2. Transport the specimen in a pocket of the laboratory coat to avoid attracting attention.
  3. Carry the specimen in a sealed primary container without secondary packaging.
  4. Place the specimen in a plastic bag and carry it openly through public corridors.

Explanation

Transport of infectious substances requires a triple-packaging system: a primary receptacle, absorbent material, and a leakproof secondary container, all within an outer package. This layered approach contains spills and prevents release during transport.

Question 32Biosafety and Facility Management

A facility is evaluating the use of a Class III biological safety cabinet for work with a Risk Group 4 agent. Which statement best describes the role of this cabinet in such work?

  1. It provides an airtight primary containment barrier operated through attached gloves. Correct answer.
  2. It relies on room air to dilute aerosols before they reach the worker.
  3. It provides protection only against splashes and not against aerosols.
  4. It is used only for storage of clean supplies outside the containment area.

Explanation

A Class III biological safety cabinet is a gas-tight enclosure with attached gloves that provides the highest level of primary containment for work with Risk Group 4 agents. It isolates the worker from all infectious aerosols and is not dependent on room air dilution.

Question 33Biosafety and Facility Management

A laboratory's autoclave is being validated for decontaminating waste. Which statement best explains why biological indicators are used in this validation?

  1. They contain highly resistant spores that demonstrate whether the cycle achieves sterilization. Correct answer.
  2. They change color when the chamber reaches the set temperature.
  3. They are used to calibrate the temperature gauge on the autoclave.
  4. They measure the pressure inside the chamber during the cycle.

Explanation

Biological indicators contain spores of highly resistant organisms, and their survival or inactivation directly demonstrates whether the sterilization cycle was effective. Chemical indicators and gauges measure physical parameters but do not prove that the process killed resistant microorganisms.

Question 34Biosafety and Facility Management

A laboratory is reviewing its emergency response plan for a spill of infectious material that occurs inside a centrifuge during operation. Which action should be included as the first step after the centrifuge has come to a complete stop?

  1. Spray the exterior of the centrifuge with disinfectant and continue using it.
  2. Remove the rotor and carry it through the laboratory to the sink.
  3. Wait a set period to allow aerosols to settle before opening the centrifuge. Correct answer.
  4. Open the centrifuge immediately to assess the extent of the spill.

Explanation

After a spill in a centrifuge, aerosols may be generated, so the lid should remain closed for a defined period to allow aerosols to settle before opening. Opening immediately or moving the rotor through the laboratory can disperse infectious material.

Question 35Biosafety and Facility Management

A laboratory is selecting a disinfectant for use against a non-enveloped virus on work surfaces. Which property is most important to verify when choosing the product?

  1. The product has a pleasant fragrance for worker comfort.
  2. The product is supplied in a large container for convenience.
  3. The product is the least expensive option available.
  4. The product is labeled as effective against non-enveloped viruses with a demonstrated contact time. Correct answer.

Explanation

Non-enveloped viruses are generally more resistant to disinfectants than enveloped viruses, so the product label must specifically claim efficacy against non-enveloped viruses and specify an adequate contact time. Fragrance, cost, and container size do not indicate antimicrobial efficacy.

Question 36Biosafety and Facility Management

A laboratory worker is preparing to work with a volatile hazardous chemical inside a Class II biological safety cabinet. Which statement best describes the appropriate consideration for this situation?

  1. Volatile chemicals should not be used in a recirculating Class II cabinet because they can pass through the HEPA filter. Correct answer.
  2. The chemical can be used safely if the cabinet is certified for biological work only.
  3. The cabinet should be operated with the sash fully open to dilute the chemical vapor.
  4. The cabinet is designed to handle both biological and volatile chemical hazards without any modification.

Explanation

A standard recirculating Class II biological safety cabinet is designed for biological containment, and volatile chemicals can pass through HEPA filters and be released into the laboratory or exhaust system. Work with volatile chemicals requires a cabinet specifically designed for chemical hazards or appropriate ducted exhaust.

Question 37Biosafety and Facility Management

A laboratory is planning to install a new biological safety cabinet. Which statement best describes the role of the certification performed at the time of installation?

  1. It replaces the need for routine annual certification thereafter.
  2. It verifies the room's ventilation rate rather than the cabinet's performance.
  3. It is required only for cabinets used with Risk Group 4 agents.
  4. It confirms that the cabinet meets the specified performance standards before it is placed into service. Correct answer.

Explanation

Certification at installation verifies that the cabinet meets performance standards such as airflow and filter integrity before it is used. It does not eliminate the need for periodic recertification, and it applies to cabinets used at various biosafety levels.

Question 38Biosafety and Facility Management

A laboratory is evaluating whether to use a Class II biological safety cabinet for work with a Risk Group 3 agent that may be transmitted by the aerosol route. Which statement best reflects the containment principle involved?

  1. A Class II cabinet is designed only for chemical fume containment.
  2. A Class II cabinet provides primary containment of aerosols and is appropriate when used within a BSL-3 facility. Correct answer.
  3. A Class II cabinet should be used with the room at positive pressure to protect the worker.
  4. A Class II cabinet is sufficient by itself without any facility-level controls.

Explanation

A Class II biological safety cabinet provides primary containment of infectious aerosols and is used within a BSL-3 facility that supplies the required secondary containment, such as negative pressure and controlled access. The cabinet alone does not replace facility-level controls.

Question 39Biosafety and Facility Management

A laboratory reports a possible release of infectious aerosol into the corridor from a BSL-3 laboratory. Which sequence of actions best reflects an appropriate initial response?

  1. Continue normal operations and document the event at the end of the week.
  2. Evacuate the corridor, restrict access, notify the biosafety officer, and initiate decontamination after allowing aerosols to settle. Correct answer.
  3. Turn off the laboratory exhaust system to prevent further release.
  4. Open all laboratory doors to dilute the aerosol with corridor air.

Explanation

The initial response to a suspected infectious aerosol release is to evacuate and restrict access to the affected area, notify the biosafety officer, and allow aerosols to settle before decontamination. Opening doors or shutting down exhaust would spread contamination or defeat containment.

Question 40Biosafety and Facility Management

A laboratory is comparing the use of a Class II biological safety cabinet and a chemical fume hood for work with a hazardous agent. Which statement best describes the fundamental difference in their primary function?

  1. A Class II cabinet is designed only for chemical work, while a fume hood is designed for biological work.
  2. Both devices provide equivalent protection for biological aerosols and chemical vapors.
  3. A fume hood provides product protection for cell cultures, while a Class II cabinet does not.
  4. A Class II cabinet protects the worker, product, and environment from biological aerosols, while a fume hood primarily protects the worker from chemical vapors. Correct answer.

Explanation

A Class II biological safety cabinet is designed to protect the worker, the product, and the environment from biological aerosols through HEPA-filtered airflow. A chemical fume hood is designed primarily to protect the worker from chemical vapors and does not provide product protection.

Question 41Biohazard Risk Assessment and Containment

Under the JBA written biosafety framework, which risk group classification applies to an agent that is unlikely to cause human disease?

  1. Risk Group 1 Correct answer.
  2. Risk Group 4
  3. Risk Group 2
  4. Risk Group 3

Explanation

Risk Group 1 covers agents that are not associated with disease in healthy adult humans and pose minimal individual and community risk. Higher groups are defined by increasing ability to cause serious disease and to spread in the community.

Question 42Biohazard Risk Assessment and Containment

Which containment level is generally the minimum for work with a Risk Group 2 bacterial pathogen on an open bench?

  1. Biosafety Level 3
  2. Biosafety Level 1
  3. Biosafety Level 4
  4. Biosafety Level 2 Correct answer.

Explanation

Risk Group 2 agents are normally handled at Biosafety Level 2, which adds restricted access, biohazard signage, and enhanced decontamination to the basic Level 1 practices. Level 1 is reserved for agents not associated with disease.

Question 43Biohazard Risk Assessment and Containment

A laboratory worker develops a needlestick injury while manipulating a culture of a Risk Group 3 organism. Which action should be taken first?

  1. Complete the incident report at the end of the shift
  2. Wait for symptoms to appear before reporting
  3. Immediately wash the wound and report to the designated medical officer Correct answer.
  4. Continue the experiment and decontaminate the bench only

Explanation

Immediate wound washing reduces inoculum, and prompt reporting triggers post-exposure evaluation and any prophylaxis. Delaying notification forfeits the window in which prophylaxis is most effective.

Question 44Biohazard Risk Assessment and Containment

What is the primary purpose of a biological safety cabinet in a containment laboratory?

  1. To maintain a positive pressure relative to the room
  2. To provide a chemical fume extraction route
  3. To protect the worker, the product, and the environment by filtering air Correct answer.
  4. To sterilize waste before disposal

Explanation

A biological safety cabinet uses HEPA filtration and directional airflow to contain aerosols and protect both the operator and the material being handled. It is not a sterilizer or a chemical fume hood.

Question 45Biohazard Risk Assessment and Containment

Which practice is a core element of standard precautions in a biosafety program?

  1. Eating at the bench during long incubations
  2. Hand hygiene after removing gloves Correct answer.
  3. Recapping needles using one hand
  4. Sharing personal protective equipment between staff

Explanation

Standard precautions assume all blood and body fluids are potentially infectious, and hand hygiene after glove removal is a fundamental control. Needle recapping and eating in the laboratory are prohibited practices.

Question 46Biohazard Risk Assessment and Containment

A spill of infectious material occurs inside a centrifuge. Which immediate action is most appropriate?

  1. Leave the lid closed and allow aerosols to settle before decontaminating Correct answer.
  2. Open the lid at once to ventilate the rotor chamber
  3. Vacuum the chamber with a standard laboratory vacuum
  4. Spray disinfectant into the closed centrifuge and restart it

Explanation

Aerosols generated by a centrifuge failure must be allowed to settle, typically for at least 30 minutes, before the lid is opened. The interior is then decontaminated with an appropriate disinfectant while wearing PPE.

Question 47Biohazard Risk Assessment and Containment

Which factor most directly determines the containment level assigned to a specific procedure?

  1. The volume of media used in the protocol
  2. The aerosol-generating potential of the procedure Correct answer.
  3. The cost of the required equipment
  4. The seniority of the supervising scientist

Explanation

Risk assessment considers both the agent and the procedure, because operations that generate aerosols or high concentrations can raise the required containment. Volume and cost are not determinants of biological risk.

Question 48Biohazard Risk Assessment and Containment

In a Biosafety Level 3 facility, what is the purpose of directional airflow into the laboratory?

  1. To cool the incubators
  2. To increase humidity for cell culture
  3. To reduce noise from the ventilation system
  4. To prevent airborne agents from escaping into corridors Correct answer.

Explanation

Level 3 facilities maintain inward airflow so that air moves from clean corridors into the laboratory and is exhausted through HEPA filters. This prevents release of infectious aerosols into adjacent spaces.

Question 49Biohazard Risk Assessment and Containment

A researcher plans to use a Class II biological safety cabinet for work with a volatile toxic chemical. What is the correct assessment?

  1. The cabinet will safely exhaust the chemical vapor
  2. Volatile chemicals should not be used because the cabinet recirculates air Correct answer.
  3. The cabinet sterilizes the chemical on contact
  4. The cabinet is appropriate if the sash is fully open

Explanation

Class II cabinets recirculate filtered air and do not safely remove chemical vapors, so volatile toxic chemicals require a fume hood. Using them in a biological safety cabinet can expose the operator and damage filters.

Question 50Biohazard Risk Assessment and Containment

Which waste stream must be autoclaved before disposal from a containment laboratory?

  1. Radioactive isotopes with long half-lives
  2. Uncontaminated cardboard packaging
  3. Chemical solvents that are flammable
  4. Solid infectious waste and contaminated sharps containers approved for autoclaving Correct answer.

Explanation

Infectious solid waste and heat-stable sharps containers are decontaminated by validated autoclave cycles before disposal. Chemical and radioactive waste follow separate, incompatible disposal routes.