OSSF DR TEST PRACTICE EXAM STUDY GUIDE WITH COMPLETE SOLUTIONS
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Course
2024/2025
Institution
2024/2025
OSSF DR TEST PRACTICE EXAM
STUDY GUIDE WITH COMPLETE
SOLUTIONS
_______ and ________ soil textural classes are always unsuitable for standard absorptive OSSF -
Answer-class IA and IV
List each of the major soil horizons - Answer-surface soil A, surface soil B, and parent material
_____________...
Physical removal of bacteria by straining occurs when _______. - Answer✔✔-the bacteria are larger than
the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. - Answer✔✔-suspended solid
Which of the following describes domestic wastewater as it leaves a home? - Answer✔✔-fresh, light in
color, has dissolved oxygen
Which of the following are problems caused by malfunctioning septic tank systems? - Answer✔✔-
surface water pollution, groundwater contamination, and standing sewage in neighborhoods
An inorganic chemical that affects human health is - Answer✔✔-nitrate
Parasites (helminths) found in untreated sewage include ________. - Answer✔✔-hookworm, round
worms, and tapeworms
Viruses are responsible for such diseases as - Answer✔✔-poliomyelitis and infectious hepatitis
A type of bacteria that indicates sewage contamination is ________. - Answer✔✔-fecal coliform
Protozoa are very simple animal organisms that may cause ________. - Answer✔✔-amoeba dysentery
and Giardiasis
Waterborne diseases that spread by pathogenic bacteria include _________. - Answer✔✔-typhoid,
cholera, and dysentery
Microorganisms in wastewater include __________. - Answer✔✔-bacteria, viruses, protozoa and
helminths.
Microorganisms that cause disease are called _________. - Answer✔✔-pathogens
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