OSSF INSTALLER 2 COMPREHENSIVE TEST
2026 QUESTIONS AND SOLUTIONS
◉ Over ___ of workers who die in confined spaces are attempting to
recue other workers. Answer: 50%
◉ Which of the following is NOT a characteristic of confined space?
Answer: Has natural air movement which provides a good quality
atmosphere
◉ List the symptoms of asphyxiation. Answer: headache
drowsiness
dizziness
nausia
◉ Which of the following characteristics is true of microorganisms?
Answer: Important in the process of wastewater digestion
◉ Domestic wastewater contains microorganisms that are capable
of causing______________. Answer: infection and infectious diseases
◉ Bacteria that causes diseases are called______________. Answer:
pathogens
,◉ Microorganisms in wastewater include__________________. Answer:
bacteria, viruses, protozoa and helminths
◉ Waterborne diseases that spread by pathogenic bacteria
include______________________________. Answer: typhoid, cholera,
dysentery
◉ Protozoa are very simple organisms that may
cause__________________. Answer: Amoebic dysentery and giardiasis
◉ A type of bacteria tested to indicate wastewater contamination
is_____________________________. Answer: fecal coliform
◉ As kit leaves the home, domestic wastewater
normally_______________________. Answer: has a slight fecal odor
◉ Viruses are responsible for diseases such
as___________________________. Answer: poliomyelitis and infectious
hepatitis
◉ A solid that can be filtered out of the wastewater
is__________________________. Answer: suspended solid
, ◉ Parasites (helminths) found in untreated waste water
include__________________________. Answer: hookworms, round worms
and tapeworms
◉ Nitrogen or nitrate removal in soil occurs by__________________.
Answer: vegetation uptake
◉ In wastewater, compounds containing carbon and other elements,
particularly hydrogen and oxygen are ______________________. Answer:
organic
◉ Where would an anaerobic bacteria NOT be found? Answer:
Activated sludge
◉ Which of the following statements is true? Answer: Dissolved
oxygen in waste water indicates freshness
◉ Which of the following descriptions is NOT a characteristic of
organic materials in domestic waste water? Answer: Include sand,
grit and minerals
◉ Physical removal of bacteria by straining occurs
when______________________. Answer: the pores in the soil are large
2026 QUESTIONS AND SOLUTIONS
◉ Over ___ of workers who die in confined spaces are attempting to
recue other workers. Answer: 50%
◉ Which of the following is NOT a characteristic of confined space?
Answer: Has natural air movement which provides a good quality
atmosphere
◉ List the symptoms of asphyxiation. Answer: headache
drowsiness
dizziness
nausia
◉ Which of the following characteristics is true of microorganisms?
Answer: Important in the process of wastewater digestion
◉ Domestic wastewater contains microorganisms that are capable
of causing______________. Answer: infection and infectious diseases
◉ Bacteria that causes diseases are called______________. Answer:
pathogens
,◉ Microorganisms in wastewater include__________________. Answer:
bacteria, viruses, protozoa and helminths
◉ Waterborne diseases that spread by pathogenic bacteria
include______________________________. Answer: typhoid, cholera,
dysentery
◉ Protozoa are very simple organisms that may
cause__________________. Answer: Amoebic dysentery and giardiasis
◉ A type of bacteria tested to indicate wastewater contamination
is_____________________________. Answer: fecal coliform
◉ As kit leaves the home, domestic wastewater
normally_______________________. Answer: has a slight fecal odor
◉ Viruses are responsible for diseases such
as___________________________. Answer: poliomyelitis and infectious
hepatitis
◉ A solid that can be filtered out of the wastewater
is__________________________. Answer: suspended solid
, ◉ Parasites (helminths) found in untreated waste water
include__________________________. Answer: hookworms, round worms
and tapeworms
◉ Nitrogen or nitrate removal in soil occurs by__________________.
Answer: vegetation uptake
◉ In wastewater, compounds containing carbon and other elements,
particularly hydrogen and oxygen are ______________________. Answer:
organic
◉ Where would an anaerobic bacteria NOT be found? Answer:
Activated sludge
◉ Which of the following statements is true? Answer: Dissolved
oxygen in waste water indicates freshness
◉ Which of the following descriptions is NOT a characteristic of
organic materials in domestic waste water? Answer: Include sand,
grit and minerals
◉ Physical removal of bacteria by straining occurs
when______________________. Answer: the pores in the soil are large
