Water Quality Standards
- Previous year questions on Water Quality Standards 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.
- 28 live questions in Water Quality Standards.
- 2 of 28 questions carry a verified exam year: 2018, 2019.
- Community Medicine is worth about 25 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 6 Sept 2026.
Q1.Which of the following do not cause hardness of water ?
- ACalcium carbonate✓ Correct answer
- BCalcium sulphate
- CCalcium bicarbonate
- DMagnesium bicarbonate
Q2.What is Saturation index?
- AUsed to assess the Air quality by measuring concentration of pollutants.
- BUsed to assess the water quality by estimating hardness, total dissolved solids, alkalinity and pH.✓ Correct answer
- CUsed to assess the Soil quality that whether it is good for growing crops.
- DUsed to assess the Milk quality by estimating the bacterial count in it.
Q3.Quantitative requirement of water in Urban areas per day:-
- A220 liters per capita
- B100 liters per capita
- C150 liters per capita✓ Correct answer
- D300 liters per capita
Q4.All of the following statements about Hardness of Water are true, except:(2018)
- AHardness is soap destroying power of water
- BBicarbonates cause Permanent Hardness✓ Correct answer
- CCarbonate hardness can be removed by boiling
- DHardness is mainly caused by Calcium and Magnesium salts
Q5.Which of the following is true about pathophysiology of skeletal fluorosis?
- AFluorine increases PTH levels by direct action
- BFluoroappatite crystals are resistant to osteoclasts✓ Correct answer
- CFluorine decreases vitamin D levels
- DFluorine erodes bone, thereby decreasing bone density
Q6.What is the diagnostic radiological finding in skeletal fluorosis?
- ASclerosis of sacroiliac joint
- BInterosseous membrane ossification✓ Correct answer
- COsteosclerosis of veebral body
- DOssification of ligaments of knee joint
Q7.Chronic flurosis is caused by drinking water with fluride content of:
- A1-5 ppm
- B5-10 ppm
- C> 10 ppm✓ Correct answer
- D10-15 ppm
Q8.Which of the following is the accepted safe level of flouride in drinking water ?
- A0.5 - 0.8 ppm✓ Correct answer
- B1.5 - 3 ppm
- C76 ppm
Q9.The following organism because of its easy culture methods is widely used as bacteriology indicator of water pollution-
- AFoecal streptococci
- BEscherichia coli✓ Correct answer
- CClostridium perfringes
- DSalmonella Typhi
Q10.All of the following are acceptable criteria for water quality except -
- ADissolved O2 of 5 mg\/L✓ Correct answer
- BNitrates of 1 mg\/L
- CNitrites of 1-2 mg\/L
- DFree & saline NH3 of 0.05 mg\/L
Answer key
Q1: A. Calcium carbonate; Q2: B. Used to assess the water quality by estimating hardness, total dissolved solids, alkalinity and pH; Q3: C. 150 liters per capita; Q4: B. Bicarbonates cause Permanent Hardness; Q5: B. Fluoroappatite crystals are resistant to osteoclasts; Q6: B. Interosseous membrane ossification; Q7: C. > 10 ppm; Q8: A. 0.5 - 0.8 ppm; Q9: B. Escherichia coli; Q10: A. Dissolved O2 of 5 mg\/L.
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
- Disinfection and Sterilization Methods
- Screening
- Respiratory Infections of Viral Origin
- Respiratory Infections of Bacterial Origin
- Enteric and Intestinal Infections
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- Viral Zoonoses
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- Cardiovascular Disease and Diabetes
- Cancer, Obesity and Blindness
- National Health Programmes: NVBDCP
- National Health Programmes: NLEP, NTEP and NACO
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- Demographic Cycle, Growth Rate and Age Pyramid
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- 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
- 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
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- 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