Environmental Health Officer (EHO) Exam –
Version B| Multiple Choice Questions (MCQs)
1. Environmental health primarily focuses on controlling factors that:
A. Increase industrial output
B. Affect wildlife populations only
C. Can adversely affect human health (Correct Answer)
D. Influence economic growth
Rationale: Environmental health targets environmental factors that impact human health and
well-being.
2. Which responsibility is MOST closely associated with an Environmental
Health Officer?
A. Prescribing treatment
B. Enforcing public health legislation (Correct Answer)
C. Diagnosing illness
D. Conducting clinical research
Rationale: EHOs apply and enforce environmental and public health laws.
3. Which hazard category includes pesticides and cleaning chemicals?
A. Biological
B. Physical
C. Chemical (Correct Answer)
D. Ergonomic
Rationale: Chemical hazards include toxic or harmful substances.
4. Foodborne illnesses are MOST commonly caused by:
,A. Physical injuries
B. Microbial contamination (Correct Answer)
C. Excess salt
D. Food additives
Rationale: Bacteria, viruses, and parasites are leading causes of foodborne disease.
5. Which action BEST prevents contamination of ready-to-eat foods?
A. Cooling foods slowly
B. Handwashing before food handling (Correct Answer)
C. Reusing gloves
D. Leaving food uncovered
Rationale: Proper hand hygiene prevents transfer of pathogens.
6. Which temperature range is considered the food danger zone?
A. Below 0°C (32°F)
B. Above 75°C (167°F)
C. 5°C–60°C (41°F–140°F) (Correct Answer)
D. 65°C–100°C (149°F–212°F)
Rationale: Pathogens grow rapidly within the danger zone.
7. Which indicator is MOST reliable for assessing drinking water safety?
A. Odor
B. Turbidity
C. Absence of pathogenic microorganisms (Correct Answer)
D. Mineral content
Rationale: Microbiological safety is critical for potable water.
8. The MAIN purpose of water fluoridation is to:
, A. Kill bacteria
B. Improve taste
C. Reduce dental caries (Correct Answer)
D. Remove heavy metals
Rationale: Fluoride strengthens tooth enamel and prevents cavities.
9. Which waste type requires special handling due to infection risk?
A. Garden waste
B. Construction debris
C. Healthcare waste (Correct Answer)
D. Recyclable plastics
Rationale: Healthcare waste may contain infectious agents.
10. Vector-borne diseases are transmitted by:
A. Contaminated food
B. Living organisms such as insects (Correct Answer)
C. Chemicals
D. Physical contact only
Rationale: Vectors transmit pathogens between hosts.
11. Which environmental condition MOST encourages rodent infestation?
A. Clean surroundings
B. Poor waste storage (Correct Answer)
C. Bright lighting
D. Proper drainage
Rationale: Rodents are attracted to food waste and shelter.
12. The purpose of a sanitary inspection is to:
Version B| Multiple Choice Questions (MCQs)
1. Environmental health primarily focuses on controlling factors that:
A. Increase industrial output
B. Affect wildlife populations only
C. Can adversely affect human health (Correct Answer)
D. Influence economic growth
Rationale: Environmental health targets environmental factors that impact human health and
well-being.
2. Which responsibility is MOST closely associated with an Environmental
Health Officer?
A. Prescribing treatment
B. Enforcing public health legislation (Correct Answer)
C. Diagnosing illness
D. Conducting clinical research
Rationale: EHOs apply and enforce environmental and public health laws.
3. Which hazard category includes pesticides and cleaning chemicals?
A. Biological
B. Physical
C. Chemical (Correct Answer)
D. Ergonomic
Rationale: Chemical hazards include toxic or harmful substances.
4. Foodborne illnesses are MOST commonly caused by:
,A. Physical injuries
B. Microbial contamination (Correct Answer)
C. Excess salt
D. Food additives
Rationale: Bacteria, viruses, and parasites are leading causes of foodborne disease.
5. Which action BEST prevents contamination of ready-to-eat foods?
A. Cooling foods slowly
B. Handwashing before food handling (Correct Answer)
C. Reusing gloves
D. Leaving food uncovered
Rationale: Proper hand hygiene prevents transfer of pathogens.
6. Which temperature range is considered the food danger zone?
A. Below 0°C (32°F)
B. Above 75°C (167°F)
C. 5°C–60°C (41°F–140°F) (Correct Answer)
D. 65°C–100°C (149°F–212°F)
Rationale: Pathogens grow rapidly within the danger zone.
7. Which indicator is MOST reliable for assessing drinking water safety?
A. Odor
B. Turbidity
C. Absence of pathogenic microorganisms (Correct Answer)
D. Mineral content
Rationale: Microbiological safety is critical for potable water.
8. The MAIN purpose of water fluoridation is to:
, A. Kill bacteria
B. Improve taste
C. Reduce dental caries (Correct Answer)
D. Remove heavy metals
Rationale: Fluoride strengthens tooth enamel and prevents cavities.
9. Which waste type requires special handling due to infection risk?
A. Garden waste
B. Construction debris
C. Healthcare waste (Correct Answer)
D. Recyclable plastics
Rationale: Healthcare waste may contain infectious agents.
10. Vector-borne diseases are transmitted by:
A. Contaminated food
B. Living organisms such as insects (Correct Answer)
C. Chemicals
D. Physical contact only
Rationale: Vectors transmit pathogens between hosts.
11. Which environmental condition MOST encourages rodent infestation?
A. Clean surroundings
B. Poor waste storage (Correct Answer)
C. Bright lighting
D. Proper drainage
Rationale: Rodents are attracted to food waste and shelter.
12. The purpose of a sanitary inspection is to:
