Container closure systems MCQs With Answer

Container closure systems MCQs With Answer

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Container closure systems MCQs With Answer

Introduction: This quiz set on container closure systems is designed specifically for M.Pharm students studying Product Development and Technology Transfer. It covers detailed aspects of materials (glass, elastomers, polymers), seal designs, extractables and leachables, container closure integrity (CCI) testing, sterilization effects, and regulatory expectations. Questions emphasize practical implications for formulation stability, sterility maintenance, particulate control, headspace management, and compatibility studies encountered during development and tech transfer of sterile and non-sterile dosage forms. Use these MCQs to evaluate your understanding of how container closure choices influence product quality, safety, and regulatory compliance throughout product life cycle.

Q1. What is the primary function of a container closure system for parenteral products?

  • Provide physical barrier to protect dosage form from external contamination and maintain sterility and stability
  • Act only as a marketing and labeling surface
  • Serve exclusively to allow easy administration of drug
  • Function solely as secondary packaging for transport

Correct Answer: Provide physical barrier to protect dosage form from external contamination and maintain sterility and stability

Q2. Which USP chapter specifically focuses on package integrity evaluation and CCI methodologies?

  • USP chapter 381
  • USP chapter 71
  • USP chapter 1207 (Package Integrity Evaluation)
  • USP chapter 659

Correct Answer: USP chapter 1207 (Package Integrity Evaluation)

Q3. Which glass type is preferred for vials used with injectable and parenteral products due to chemical durability?

  • Type I borosilicate glass
  • Type II soda-lime glass
  • Type III general-purpose glass
  • Type NP non-parenteral glass

Correct Answer: Type I borosilicate glass

Q4. Which study is performed under exaggerated conditions to identify potential chemical species that may migrate from closure materials into a drug product?

  • Extractables testing
  • Microbial challenge testing
  • Container closure integrity testing
  • Endotoxin testing

Correct Answer: Extractables testing

Q5. Which container closure integrity method offers the highest sensitivity for detecting very small leaks?

  • Dye ingress test
  • Helium leak detection
  • Microbial ingress challenge
  • Visual seal inspection only

Correct Answer: Helium leak detection

Q6. What is the most common mechanism leading to delamination of borosilicate glass vials?

  • Chemical attack of the inner surface (silicate dissolution) often promoted by alkaline formulations
  • Mechanical shock during transport only
  • UV light exposure through the closure
  • Thermal expansion mismatch with the closure

Correct Answer: Chemical attack of the inner surface (silicate dissolution) often promoted by alkaline formulations

Q7. Which polymer family is commonly selected for prefilled syringes because of low extractables, excellent dimensional stability and optical clarity?

  • Polyvinyl chloride (PVC)
  • Polystyrene (PS)
  • Cyclic olefin polymer / cyclic olefin copolymer (COP/COC)
  • Low-density polyethylene (LDPE)

Correct Answer: Cyclic olefin polymer / cyclic olefin copolymer (COP/COC)

Q8. What is the primary regulatory expectation for a tamper-evident closure on a parenteral product?

  • Provide visible evidence of unauthorized opening or compromise of the sterile barrier
  • Make the vial impossible to open under any circumstances
  • Ensure the product cannot leak under pressure only
  • Allow replacement of stoppers after first use

Correct Answer: Provide visible evidence of unauthorized opening or compromise of the sterile barrier

Q9. Which type of elastomeric stopper is recommended for vials used in lyophilized products to withstand vacuum and repeated punctures?

  • Standard general-purpose natural rubber stoppers
  • Lyophilization-grade bromobutyl rubber stoppers
  • Plastic snap caps only
  • Non-coated silicone tubing pieces

Correct Answer: Lyophilization-grade bromobutyl rubber stoppers

Q10. Which container closure integrity method is considered probabilistic rather than deterministic?

  • Helium leak detection
  • Vacuum decay
  • Dye ingress (colorant penetration)
  • Tracer gas mass spectrometry

Correct Answer: Dye ingress (colorant penetration)

Q11. What is the principal functional requirement of a septum used with vials intended for multiple withdrawals?

  • Allow repeated needle punctures while resealing to maintain sterility
  • Provide an oxygen scavenging function
  • Act as a desiccant to keep product dry
  • Serve as a primary light barrier

Correct Answer: Allow repeated needle punctures while resealing to maintain sterility

Q12. Which is a common effect of gamma irradiation sterilization on polymer-based closures?

  • Improved tensile strength without chemical changes
  • Polymer chain scission and oxidation leading to increased extractables and possible embrittlement
  • Complete elimination of all extractables permanently
  • No measurable change to mechanical or chemical properties

Correct Answer: Polymer chain scission and oxidation leading to increased extractables and possible embrittlement

Q13. Which parameter is commonly measured to confirm that an aluminum crimp seal on a vial is properly applied?

  • Crimp height (or crimp deformation specification)
  • Septum color only
  • Vial weight increase
  • Label alignment

Correct Answer: Crimp height (or crimp deformation specification)

Q14. What does Water Vapor Transmission Rate (WVTR) characterize for a packaging film or container?

  • Rate at which oxygen permeates through a film
  • Moisture ingress or moisture barrier performance of the material
  • Mechanical tear resistance of the film
  • Optical clarity under humidity

Correct Answer: Moisture ingress or moisture barrier performance of the material

Q15. Which USP chapter provides recommended approaches for extractables and leachables studies?

  • USP chapter 71
  • USP chapter 1663 (Assessment of Extractables Associated with Pharmaceutical Packaging/Delivery Systems)
  • USP chapter 659
  • USP chapter 34

Correct Answer: USP chapter 1663 (Assessment of Extractables Associated with Pharmaceutical Packaging/Delivery Systems)

Q16. Why is oxygen in the vial headspace a major concern for many parenteral products?

  • It increases headspace pressure only
  • It can cause oxidative degradation of the active pharmaceutical ingredient
  • It causes immediate precipitation of solutes in all formulations
  • It sterilizes the product inadvertently

Correct Answer: It can cause oxidative degradation of the active pharmaceutical ingredient

Q17. Which closure modification is used to reduce particulate shedding and lower extractables from elastomeric stoppers?

  • Applying a fluoropolymer coating (e.g., Fluorotec) or parylene-like barrier coating
  • Using unprocessed natural rubber only
  • Increasing stopper porosity intentionally
  • Removing any elastomeric coating to reduce cost

Correct Answer: Applying a fluoropolymer coating (e.g., Fluorotec) or parylene-like barrier coating

Q18. Which phenomenon describes the loss of drug potency due to interaction with a polymeric container wall?

  • Sorption (adsorption/absorption) to polymer surfaces
  • Thermal denaturation by the container
  • Photolysis by colored plastics only
  • Immediate hydrolysis from the closure material

Correct Answer: Sorption (adsorption/absorption) to polymer surfaces

Q19. Which non-destructive CCI method is frequently used in finished sterile product lines for quantitative inspection?

  • Dye ingress (destructive immersion)
  • Vacuum decay (deterministic, non-destructive)
  • Microbial challenge test requiring incubation
  • Visual inspection for color only

Correct Answer: Vacuum decay (deterministic, non-destructive)

Q20. What is the main objective of compatibility testing between a drug product and its container closure system during development?

  • To evaluate potential interactions that may affect potency, safety, sterility and shelf-life of the product
  • To confirm label artwork position only
  • To demonstrate that the container is shatterproof for shipping only
  • To measure colorfastness of the container under UV light only

Correct Answer: To evaluate potential interactions that may affect potency, safety, sterility and shelf-life of the product

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