Disinfection and Sterilization Methods
- Previous year questions on Disinfection and Sterilization Methods for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Community Medicine section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 46 live questions in Disinfection and Sterilization Methods.
- 3 of 46 questions carry a verified exam year: 2017, 2018, 2019.
- Community Medicine is worth about 25 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 5 Sept 2026.
Q1.Pasteurization is done at:
- A73degC for 20 minutes
- B63degC for 30 minutes✓ Correct answer
- C94degC for 20 minutes
- D100degC for 10 minutes
Q2.sterilization accuracy is assessed by using ?
- Aclostridium perfringens
- Bgeobacillus stearothermophilus✓ Correct answer
- Cclostridium butyricum
- Dbacillus subtilis
Q3.Culture media containing egg or serum is typically sterilized by using
- ATyndallization✓ Correct answer
- BAutoclaving
- CHot air oven
- D5 % Cresol
Q4.Holding time for Hot air oven with temperature of 1800C
- A15 min
- B30 min✓ Correct answer
- C60 min
- D120 min
Q5.Biological indicator for determining efficacy of autoclaving is
- APseudomonas aeruginosa
- BClostridium perfringenes
- CBacillus stearothermophilus✓ Correct answer
- DSalmonella typhi
Q6.In Hot air Oven, for holding period of one hour temperature required is?
- A100oC
- B120oC
- C140oC
- D160oC✓ Correct answer
Q7.Blood on OT floor is cleaned by?
- APhenol
- BAlcohol based compounds
- CChlorine based compounds✓ Correct answer
- DQuaternary ammonium compounds
Q8.Main disadvantage of dry heat used for sterilization is that:
- AIt is time consuming✓ Correct answer
- BRusts the instruments
- CDulls the sharp instruments
- DIneffective sterilization
Q9.Dry heat destroys microorganisms by
- ALysis
- BOxidation✓ Correct answer
- CHydrolysis of DNA
- DCoagulation of proteins
Q10.Patient's cross-infection with sensor, in digital radiography/RVG is prevented by
- ACover with autoclaved cloth with each use
- BWipe with ethyl alcohol in each patient
- CClean with 5.25% sodium hypochlorite in each patient
- DCover with impervious barrier✓ Correct answer
Answer key
Q1: B. 63degC for 30 minutes; Q2: B. geobacillus stearothermophilus; Q3: A. Tyndallization; Q4: B. 30 min; Q5: C. Bacillus stearothermophilus; Q6: D. 160oC; Q7: C. Chlorine based compounds; Q8: A. It is time consuming; Q9: B. Oxidation; Q10: D. Cover with impervious barrier.
Other topics in Community Medicine
- Evolution of Medicine
- Determinants and Indicators of Health
- Disease Concepts and Levels of Prevention
- Epidemiological Principles
- Descriptive Study Designs
- Analytical Study Designs: Case-Control and Cohort
- Experimental and Trial Designs
- Core Terminology in Infectious Disease Epidemiology
- Disease Transmission Dynamics
- Immunization and Vaccination Principles
- Vaccine Manufacture and Cold Chain Storage
- Screening
- Respiratory Infections of Viral Origin
- Respiratory Infections of Bacterial Origin
- Enteric and Intestinal Infections
- Arthropod-Transmitted Infections
- Viral Zoonoses
- Bacterial and Parasitic Zoonoses
- Sexually Transmitted and Surface Infections
- Cardiovascular Disease and Diabetes
- Cancer, Obesity and Blindness
- National Health Programmes: NVBDCP
- National Health Programmes: NLEP, NTEP and NACO
- National Health Programmes: NIS, JSY, RBSK and Others
- Demographic Cycle, Growth Rate and Age Pyramid
- Demographic Indicators
- Family Planning
- Preventive Care in Pregnancy, Childhood and Old Age
- Macronutrients and Energy Requirements
- Vitamins, Minerals and Water
- Food Processing, Safety and Quality
- Sociological and Psychological Concepts
- Social Structure and Health Economics
- Water Sources and Purification
- Water Disinfection
- Water Quality Standards
- Climate and Environmental Meteorology
- Housing Standards and Ventilation
- Lighting, Noise and Radiation
- Refuse and Sewage Disposal
- Mosquitoes and Flies as Disease Vectors
- Ticks, Fleas and Mites as Disease Vectors
- Pest and Vector Control Measures
- Handling and Disposal of Biomedical Waste
- Disaster Preparedness and Response
- Occupational Diseases and Hazards
- ESI Scheme and the Factories Act
- Health Education and Communication Methods
- Planning and Management of Health Services
- Health Service Delivery in India
- Global Health and International Agencies
- Probability and Types of Data
- Measures of Central Tendency
- Measures of Variability and Dispersion
- Measures of Position: Percentiles and Z-Scores
- Principles of Inferential Statistics
- Hypothesis Testing Concepts
- Significance Testing Methods
- Correlation and Regression Techniques
- Clinical Research Design and Applied Biostatistics
- Community Mental Health
- Genetics in Public Health