Chapter Exam

Chapter 4: Sterilization — Online MCQ Test

Q: What is the process of completely destroying or removing all forms of microbial life, including spores?

Answer: B. Sterilization — Sterilization is the total destruction of all microorganisms including highly resistant bacterial endospores.

Q: Which of the following is an example of a physical method of sterilization?

Answer: B. Autoclaving — Autoclaving uses steam under pressure, which is a physical method involving thermal control.

Q: Which of the following organisms is often used as a biological indicator to test autoclave efficiency?

Answer: B. Geobacillus stearothermophilus — Geobacillus stearothermophilus spores are highly heat resistant and are the gold standard for autoclave validation.

MICROBIOLOGY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 4: Sterilization with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th MICROBIOLOGY. This chapter covers: Focusing on microbial control this chapter covers physical agents heat filtration radiation and chemical disinfectants. Students analyze sterilization mechanics autoclaving hot air.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 4: Sterilization — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th MICROBIOLOGY — Chapter 4: Sterilization, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the process of completely destroying or removing all forms of microbial life, including spores?

A. Disinfection
B. Sterilization ✓
C. Sanitization
D. Antisepsis

Answer: B. Sterilization
Sterilization is the total destruction of all microorganisms including highly resistant bacterial endospores.

Which of the following is an example of a physical method of sterilization?

A. Phenolics
B. Autoclaving ✓
C. Ethylene oxide
D. Halogens

Answer: B. Autoclaving
Autoclaving uses steam under pressure, which is a physical method involving thermal control.

Which of the following organisms is often used as a biological indicator to test autoclave efficiency?

A. Bacillus subtilis
B. Geobacillus stearothermophilus ✓
C. Escherichia coli
D. Staphylococcus aureus

Answer: B. Geobacillus stearothermophilus
Geobacillus stearothermophilus spores are highly heat resistant and are the gold standard for autoclave validation.

If you are comparing an autoclave and a hot air oven, which statement is true?

A. Autoclave uses dry heat, oven uses moist heat.
B. Oven requires higher temperatures (160-180°C) for a longer time than the autoclave. ✓
C. Both require identical holding times.
D. Autoclave is safer for dry powders.

Answer: B. Oven requires higher temperatures (160-180°C) for a longer time than the autoclave.
Dry heat (oven) is less penetrative than moist heat (autoclave), thus requiring higher temperatures and longer durations.

Why is the use of 'autoclave tape' alone insufficient to prove that items are sterile?

A. The tape is too expensive.
B. It only indicates that the specific temperature was reached, not the duration or pressure required for sterilization. ✓
C. The tape changes color due to humidity only.
D. Bacteria can survive on the tape.

Answer: B. It only indicates that the specific temperature was reached, not the duration or pressure required for sterilization.
Autoclave tape is a chemical indicator of temperature only; biological indicators are required to confirm the killing of resistant spores.

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