REHS/RS NEHA Study Guide - Questions
with Complete Solutions (Latest 2025/2026).
When gas pipe is leaking, what methods would be used by the technician to identify the exact point of
leakage? - CORRECT ANSWERS Using soap bubble solution
What is the graphic tool used by meteorologists to give a succinct view of how wind speed and direction
are typically distributed at a particular location - CORRECT ANSWERS Wind Rose
What is the lowest portion of Earth's atmosphere called: - CORRECT ANSWERS troposphere (a
height of about 3.7-6.2 miles (6-10 km)
What three viruses cause the largest number of known
cases of illness through contaminated food: - CORRECT ANSWERS Hepatitis, Rotavirus,
Norovirus
Shellfish poisoning is caused by a group of toxins produced by: - CORRECT ANSWERS
planktonic algae (dinoflagellates, in most cases)
What is the most widely accepted detection method for the saxitoxins (Paralytic Shellfish Poisoning)
around the world: - CORRECT ANSWERS mouse bioassay (not as useful in Diarrhetic Shellfish
Poisoning or Neurotoxic Shellfish Poisoning)
Pufferfish (also called "fugu" or "blowfish") are thought of as a delicacy - even though they contain this
toxin: - CORRECT ANSWERS tetrodotoxin (in some types of pufferfish, some of the organs like
the liver and skin contain tetrodotoxin; in some pufferfish the toxin is in the meat also; and some have
no toxin at all)
Compounds that cause neurological symptoms such as profuse sweating, coma, convulsions,
hallucinations, excitement, depression, spastic colon - CORRECT ANSWERS Neurotoxins
Compounds that produce rapid, transient nausea, vomiting, abdominal cramping, and diarrhea: -
CORRECT ANSWERS gastrointestinal irritants
mushrooms in this category generally are nontoxic and produce no symptoms, unless alcohol is
consumed within 72 hours after eating them, in which case a short-lived, acute toxic syndrome is
produced: - CORRECT ANSWERS disulfiram‐like toxins
This is is a human illness caused by consumption of some subtropical and tropical marine finfish -
CORRECT ANSWERS Ciguatera fish poisoning (caused by consumption of subtropical and
tropical marine finfish that have accumulated ciguatoxins through their diets)
Powdered infant formula is not sterile, and its nutrients provide good conditions for the growth of -
CORRECT ANSWERS Cronobacter (after reconstitution)
Travelers diarrhea is caused by which E. Coli (acronym)? - CORRECT ANSWERS ETEC
(Enterotoxigenic Escherichia coli)
,Cholera is caused by which bacteria - CORRECT ANSWERS Vibrio (but not all Vibrio cause
cholera)
Q fever is caused by which food borne illness causing bacteria - CORRECT ANSWERS Coxiella
burnetii (the CDC has declared it a Category B potential bioterrorism agent)
Plant FOODS that are cooked for hot holding shall be cooked to a temperature of - CORRECT ANSWERS
135F
How long must POULTRY, BALUTS, wild GAME ANIMALS (as specified under Subparagraphs 3-
201.17(A)(3) and (4)), stuffed FISH, stuffed MEAT, stuffed pasta, stuffed POULTRY, stuffed RATITES, or
stuffing containing FISH, MEAT, POULTRY, or RATITES be cooked at 165F? - CORRECT ANSWERS
instantaneous
Fish to be served raw must be frozen how cold for how long? (except some Tuna and aquaculture fish) -
CORRECT ANSWERS -4F for 7 days, -31 for 15 hours, frozen to-31F until solid then stored -4°F
for 24 hours
If immersion in hot water is used for SANITIZING in a manual operation, the temperature of the water
shall be maintained at - CORRECT ANSWERS 171F or above
Total alkalinity of swimming pools shall be maintained in the range of: - CORRECT ANSWERS
60-180 ppm (mg/l)
the thick-walled, environmentally resistant structure released in the feces of infected animals that
serves to transfer the infectious stages of sporozoan parasites (e.g., Cryptosporidium) to new hosts. -
CORRECT ANSWERS Oocyst
Milligrams per Liter (mg/L) is the equivalent metric measure to: - CORRECT ANSWERS parts
per million (ppm)
liable to ignite spontaneously on exposure to air - CORRECT ANSWERS Pyrophoric
"RATITE" means - CORRECT ANSWERS a flightless bird such as an emu, ostrich, or rhea.
Which organization requires cover for baking dough - CORRECT ANSWERS BISSC (Baking
Industry Sanitation Standards Committee)
The Registered Sanitarians are first and foremost: - CORRECT ANSWERS Educators
Common microorganism associated with skin rash in whirlpools? - CORRECT ANSWERS
Pseudomonas aeruginosa
Complaining of extreme eye irritation by swimmers in a swimming pool may be: - CORRECT ANSWERS
Improper pH value
Workers in dental care may receive: - CORRECT ANSWERS Mercury Vapor poisoning
, Most accidents that occur in the home to infants aged 1-4 is caused by: - CORRECT ANSWERS
Walking/falling
Most accidents around swimming pools: - CORRECT ANSWERS Drowning
Which can adversely effect the nerve cell? - CORRECT ANSWERS Neurotoxin
This is usually found with Salmonella, caused by contaminated chicken source. High rate of infection: -
CORRECT ANSWERS Campylobacter jejuni
What is the most enteric disease: - CORRECT ANSWERS Norwalk virus
The LEAST amount of backfill over the absorption field should be: - CORRECT ANSWERS 12-18
inches
Best method to avoid UST (Underground Storage Tank)problems: - CORRECT ANSWERS
Prevent corrosion
Filters will: - CORRECT ANSWERS Reduce stray radiation
Swimmers ear is caused by: - CORRECT ANSWERS Pseudomonas
A principle for effective radiation protection: - CORRECT ANSWERS distance, time, shielding
Radiation could scatter and bounce off the - CORRECT ANSWERS wall, floor, ceiling
Know characteristics of alpha particles - CORRECT ANSWERS Are they made of protons &
neutrons? Yes
Is absorbed the most matter? No
Do they have a high penetration rate? No
Which test is initially used if water is suspected of contamination with fecal matter? - CORRECT
ANSWERS FECAL coliform.
Which one is the correct sequence? - CORRECT ANSWERS Coagulation-flocculation-
sedimentation-filtration
The minimum retention time recommended for a septic tank is: - CORRECT ANSWERS 24
hours
Which filter is BEST to use for small communities in developing areas and in rural locations? - CORRECT
ANSWERS Slow sand filter
Which filter is BEST for removal of Giardia cysts from low turbidity water - CORRECT ANSWERS
Slow sand filter
Microbial pollution travels only a short distance through: - CORRECT ANSWERS Smooth clay
with Complete Solutions (Latest 2025/2026).
When gas pipe is leaking, what methods would be used by the technician to identify the exact point of
leakage? - CORRECT ANSWERS Using soap bubble solution
What is the graphic tool used by meteorologists to give a succinct view of how wind speed and direction
are typically distributed at a particular location - CORRECT ANSWERS Wind Rose
What is the lowest portion of Earth's atmosphere called: - CORRECT ANSWERS troposphere (a
height of about 3.7-6.2 miles (6-10 km)
What three viruses cause the largest number of known
cases of illness through contaminated food: - CORRECT ANSWERS Hepatitis, Rotavirus,
Norovirus
Shellfish poisoning is caused by a group of toxins produced by: - CORRECT ANSWERS
planktonic algae (dinoflagellates, in most cases)
What is the most widely accepted detection method for the saxitoxins (Paralytic Shellfish Poisoning)
around the world: - CORRECT ANSWERS mouse bioassay (not as useful in Diarrhetic Shellfish
Poisoning or Neurotoxic Shellfish Poisoning)
Pufferfish (also called "fugu" or "blowfish") are thought of as a delicacy - even though they contain this
toxin: - CORRECT ANSWERS tetrodotoxin (in some types of pufferfish, some of the organs like
the liver and skin contain tetrodotoxin; in some pufferfish the toxin is in the meat also; and some have
no toxin at all)
Compounds that cause neurological symptoms such as profuse sweating, coma, convulsions,
hallucinations, excitement, depression, spastic colon - CORRECT ANSWERS Neurotoxins
Compounds that produce rapid, transient nausea, vomiting, abdominal cramping, and diarrhea: -
CORRECT ANSWERS gastrointestinal irritants
mushrooms in this category generally are nontoxic and produce no symptoms, unless alcohol is
consumed within 72 hours after eating them, in which case a short-lived, acute toxic syndrome is
produced: - CORRECT ANSWERS disulfiram‐like toxins
This is is a human illness caused by consumption of some subtropical and tropical marine finfish -
CORRECT ANSWERS Ciguatera fish poisoning (caused by consumption of subtropical and
tropical marine finfish that have accumulated ciguatoxins through their diets)
Powdered infant formula is not sterile, and its nutrients provide good conditions for the growth of -
CORRECT ANSWERS Cronobacter (after reconstitution)
Travelers diarrhea is caused by which E. Coli (acronym)? - CORRECT ANSWERS ETEC
(Enterotoxigenic Escherichia coli)
,Cholera is caused by which bacteria - CORRECT ANSWERS Vibrio (but not all Vibrio cause
cholera)
Q fever is caused by which food borne illness causing bacteria - CORRECT ANSWERS Coxiella
burnetii (the CDC has declared it a Category B potential bioterrorism agent)
Plant FOODS that are cooked for hot holding shall be cooked to a temperature of - CORRECT ANSWERS
135F
How long must POULTRY, BALUTS, wild GAME ANIMALS (as specified under Subparagraphs 3-
201.17(A)(3) and (4)), stuffed FISH, stuffed MEAT, stuffed pasta, stuffed POULTRY, stuffed RATITES, or
stuffing containing FISH, MEAT, POULTRY, or RATITES be cooked at 165F? - CORRECT ANSWERS
instantaneous
Fish to be served raw must be frozen how cold for how long? (except some Tuna and aquaculture fish) -
CORRECT ANSWERS -4F for 7 days, -31 for 15 hours, frozen to-31F until solid then stored -4°F
for 24 hours
If immersion in hot water is used for SANITIZING in a manual operation, the temperature of the water
shall be maintained at - CORRECT ANSWERS 171F or above
Total alkalinity of swimming pools shall be maintained in the range of: - CORRECT ANSWERS
60-180 ppm (mg/l)
the thick-walled, environmentally resistant structure released in the feces of infected animals that
serves to transfer the infectious stages of sporozoan parasites (e.g., Cryptosporidium) to new hosts. -
CORRECT ANSWERS Oocyst
Milligrams per Liter (mg/L) is the equivalent metric measure to: - CORRECT ANSWERS parts
per million (ppm)
liable to ignite spontaneously on exposure to air - CORRECT ANSWERS Pyrophoric
"RATITE" means - CORRECT ANSWERS a flightless bird such as an emu, ostrich, or rhea.
Which organization requires cover for baking dough - CORRECT ANSWERS BISSC (Baking
Industry Sanitation Standards Committee)
The Registered Sanitarians are first and foremost: - CORRECT ANSWERS Educators
Common microorganism associated with skin rash in whirlpools? - CORRECT ANSWERS
Pseudomonas aeruginosa
Complaining of extreme eye irritation by swimmers in a swimming pool may be: - CORRECT ANSWERS
Improper pH value
Workers in dental care may receive: - CORRECT ANSWERS Mercury Vapor poisoning
, Most accidents that occur in the home to infants aged 1-4 is caused by: - CORRECT ANSWERS
Walking/falling
Most accidents around swimming pools: - CORRECT ANSWERS Drowning
Which can adversely effect the nerve cell? - CORRECT ANSWERS Neurotoxin
This is usually found with Salmonella, caused by contaminated chicken source. High rate of infection: -
CORRECT ANSWERS Campylobacter jejuni
What is the most enteric disease: - CORRECT ANSWERS Norwalk virus
The LEAST amount of backfill over the absorption field should be: - CORRECT ANSWERS 12-18
inches
Best method to avoid UST (Underground Storage Tank)problems: - CORRECT ANSWERS
Prevent corrosion
Filters will: - CORRECT ANSWERS Reduce stray radiation
Swimmers ear is caused by: - CORRECT ANSWERS Pseudomonas
A principle for effective radiation protection: - CORRECT ANSWERS distance, time, shielding
Radiation could scatter and bounce off the - CORRECT ANSWERS wall, floor, ceiling
Know characteristics of alpha particles - CORRECT ANSWERS Are they made of protons &
neutrons? Yes
Is absorbed the most matter? No
Do they have a high penetration rate? No
Which test is initially used if water is suspected of contamination with fecal matter? - CORRECT
ANSWERS FECAL coliform.
Which one is the correct sequence? - CORRECT ANSWERS Coagulation-flocculation-
sedimentation-filtration
The minimum retention time recommended for a septic tank is: - CORRECT ANSWERS 24
hours
Which filter is BEST to use for small communities in developing areas and in rural locations? - CORRECT
ANSWERS Slow sand filter
Which filter is BEST for removal of Giardia cysts from low turbidity water - CORRECT ANSWERS
Slow sand filter
Microbial pollution travels only a short distance through: - CORRECT ANSWERS Smooth clay
