Quality control tests for containers and closures MCQs With Answer

Quality control tests for containers and closures MCQs With Answer

Introduction: Quality control of containers and closures is a critical component of product development and technology transfer in pharmaceutical manufacturing. This blog presents focused multiple-choice questions to help M.Pharm students deepen their understanding of the physical, chemical and microbiological tests applied to containers and closures. Coverage includes container-closure integrity methods, material characterization, seal and torque testing, extractables/leachables considerations, and regulatory expectations for sterile and non-sterile dosage forms. The questions emphasize practical test principles, acceptance criteria and interpretation, aiding students in preparing for both examinations and real-world QC challenges encountered during development and transfer.

Q1. Which test directly evaluates the ability of a sealed primary container to prevent microbial ingress under challenge conditions?

• Bacterial ingress test (microbial challenge)
• Helium leak detection
• Vacuum decay integrity test
• Dye intrusion with methylene blue

Correct Answer: Bacterial ingress test (microbial challenge)

Q2. Which container material test classifies glass by its resistance to aqueous hydrolytic attack and is used to distinguish Type I, II and III glass?

• Hydrolytic resistance (water attack test)
• Alkali resistance test
• Thermal shock test
• Light transmission test

Correct Answer: Hydrolytic resistance (water attack test)

Q3. Which non-destructive method is commonly used to detect sub-micron leaks in sterile parenteral container-closure systems?

• Dye intrusion with vacuum
• Helium mass spectrometry leak detection
• Pressure hold (bubble point) test
• Visual inspection under magnification

Correct Answer: Helium mass spectrometry leak detection

Q4. For rubber stoppers, which test assesses the material’s ability to return to original thickness after compression during vial closure?

• Compression set test
• Tensile strength test
• Elongation at break test
• Peel strength test

Correct Answer: Compression set test

Q5. Which test is most appropriate to measure the force required to open a child-resistant closure to ensure usability and safety?

• Torque to open test
• Peel force test
• Vacuum decay
• Container burst test

Correct Answer: Torque to open test

Q6. Which test evaluates the potential for substances to migrate from container or closure materials into the drug product under exaggerated conditions?

• Extractables and leachables study
• Microbial limit test
• Visual particulate inspection
• Optical rotation test

Correct Answer: Extractables and leachables study

Q7. Which container-closure integrity (CCI) method uses a pressure difference and measurement of mass change to identify leaks non-destructively?

• Vacuum decay test
• Dye ingress test
• Water bath immersion test
• Burst pressure test

Correct Answer: Vacuum decay test

Q8. Which mechanical property test is critical for evaluating thermoplastic container strength under internal pressure conditions?

• Burst pressure test
• Compression set
• Tensile adhesion to label
• Optical haze measurement

Correct Answer: Burst pressure test

Q9. During transfer of a parenteral product to a new vial type, which compatibility concern is primarily assessed by measuring drug potency and degradation over time?

• Drug-container compatibility (stability study)
• Closure torque compliance
• Visual inspection for particulate
• Dimensional tolerance assessment

Correct Answer: Drug-container compatibility (stability study)

Q10. Which analytical technique is commonly used to identify polymer types or elastomeric materials used in closures and to detect formulation-related interactions?

• Fourier-transform infrared spectroscopy (FTIR)
• Atomic absorption spectroscopy
• HPLC with UV detection
• Karl Fischer titration

Correct Answer: Fourier-transform infrared spectroscopy (FTIR)

Q11. Which test is used to evaluate the seal quality of a crimped aluminum cap on a vial in lyophilized product packaging?

• Crimp seal integrity by visual and rim torque assessment
• Particle count by light obscuration
• pH of extractables
• Glass transition temperature measurement

Correct Answer: Crimp seal integrity by visual and rim torque assessment

Q12. What is the main reason for performing water vapor transmission rate (WVTR) or oxygen transmission rate (OTR) tests on primary packaging?

• To assess barrier properties affecting product stability
• To determine closure torque limits
• To measure container dimensional tolerances
• To evaluate microbial endotoxin levels

Correct Answer: To assess barrier properties affecting product stability

Q13. Which inspection is mandated for parenteral products to detect visible foreign particulates before release?

• Visual inspection under controlled lighting
• Helium leak testing
• Microbial challenge assay
• FTIR identification

Correct Answer: Visual inspection under controlled lighting

Q14. Which test measures the adhesion between a lidding foil and blister plastic to ensure blister integrity?

• Peel strength (peel adhesion) test
• Tensile strength of the blister film
• Dye intrusion
• Compression set

Correct Answer: Peel strength (peel adhesion) test

Q15. In dye intrusion testing, which operational parameter most increases the sensitivity for detecting leak paths?

• Applying vacuum or pressure differentials during exposure
• Using visible light instead of dye
• Reducing immersion time to avoid overexposure
• Cooling the containers to cryogenic temperatures

Correct Answer: Applying vacuum or pressure differentials during exposure

Q16. Which property is specifically assessed by performing a heavy metal test on glass containers?

• Presence of leachable ionic impurities that may catalyze drug degradation
• Mechanical resistance to impact
• Optical clarity of the glass
• Seal integrity of closures

Correct Answer: Presence of leachable ionic impurities that may catalyze drug degradation

Q17. For lyophilized product vials, what test confirms that the stopper has adequate stopper-in-vial retention after freeze-drying and capping?

• Pull-off or push-out force test
• Helium leak detection
• pH of the reconstituted solution
• Container transparency measurement

Correct Answer: Pull-off or push-out force test

Q18. Which accelerated test helps predict long-term migration of plasticizers or additives from polymeric containers into aqueous drug formulations?

• Extractables study using aggressive solvents and elevated temperature
• Visual particulate inspection
• Torque to open measurement
• Water activity analysis

Correct Answer: Extractables study using aggressive solvents and elevated temperature

Q19. Which of the following is a destructive test used to confirm the physical integrity and maximum pressure capacity of a sealed container?

• Burst/leak-to-failure test (over-pressure test)
• Vacuum decay integrity test
• Helium leak detection
• Dye intrusion under vacuum

Correct Answer: Burst/leak-to-failure test (over-pressure test)

Q20. When transferring a product to a new closure material, which regulatory-driven assessment focuses on patient safety by combining toxicology, chemistry and extractables data?

• Risk assessment for extractables and leachables (E&L) including safety qualification
• Dimensional tolerance mapping
• Microbial bioburden trend analysis
• Container color consistency report

Correct Answer: Risk assessment for extractables and leachables (E&L) including safety qualification

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