Experimental and Trial Designs
- Previous year questions on Experimental and Trial Designs 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.
- 18 live questions in Experimental and Trial Designs.
- Community Medicine is worth about 25 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 3 Sept 2026.
Q1.All are true about randomized control trial except?
- ABaseline characteristics of intervention and control groups must be similar
- BInvestigator bias can be minimized by double blinding
- CThe sample size depends on the hypothesis tested
- DDrop outs should be excluded from the analysis✓ Correct answer
Q2.Randomization is done to reduce ?
- ARecall bias
- BSelection bias✓ Correct answer
- CBerksonian bias
- DReporting bias
Q3.Which of the following is used for selecting patients with respect to potential factors that will affect the results?
- ASystematic random sampling
- BSimple random sampling
- CStratified random sampling✓ Correct answer
- DCluster sampling
Q4.Which of these is not true about randomization in a clinical trial?
- AReduces confounding
- BDecreases selection bias
- CEnsures comparability of two groups
- DIncreases external validity of the trial✓ Correct answer
Q5.. The prospectively evaluated, double-blinded, randomized clinical trail represents the 'gold-standard' for providing evidence for therapeutic decision making. This was first proposed by the father of evidence-based medicine:
- ATolstoy
- BSackett✓ Correct answer
- CHippocrates
- Dda Vinci
Q6.Which of these is the best study to evaluate effect and outcome?
- AClinical trial✓ Correct answer
- BCohort study
- CCase control study
- DCross sectional study
Q7.Risk factor intervention trials for coronary hea diseases are all, EXCEPT:
- AStanford -Three Community Study
- BNoh Kerelia Project
- CLipid Research Clinics Study
- DSingle Risk Factor Intervention Trial (SR-FIT)✓ Correct answer
Q8.500 people of viral fever are treated with a medicine. 80 percent were cured in 3 days. True statement about efficacy of medicine -
- AMedicine is effective
- BCannot be commented✓ Correct answer
- CMedicine is ineffective
- DNone of the above
Q9.False about Randomised Control Trials is
- ARandomisation is done while selecting subjects for the study✓ Correct answer
- BResults of attrition are included in the analysis
- CDouble blinding is the most common form of blinding observed
- DCross-over design helps removing ethical concerns
Q10.In a double blind clinical drug trial:
- AEach patient receives a placebo.
- BEach patient receives both (double) treatments
- CThe patients do not know which treatment they are receiving✓ Correct answer
- DThe patients do not know that they are in a drug trial
Answer key
Q1: D. Drop outs should be excluded from the analysis; Q2: B. Selection bias; Q3: C. Stratified random sampling; Q4: D. Increases external validity of the trial; Q5: B. Sackett; Q6: A. Clinical trial; Q7: D. Single Risk Factor Intervention Trial (SR-FIT); Q8: B. Cannot be commented; Q9: A. Randomisation is done while selecting subjects for the study; Q10: C. The patients do not know which treatment they are receiving.
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
- Core Terminology in Infectious Disease Epidemiology
- Disease Transmission Dynamics
- Immunization and Vaccination Principles
- Vaccine Manufacture and Cold Chain Storage
- Disinfection and Sterilization Methods
- 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