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OSSF DR TEST PRACTICE TEST WITH VERIFIED SOLUTIONS
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OSSF DR TEST PRACTICE TEST WITH VERIFIED SOLUTIONS
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OSSF DR TEST PRACTICE TEST WITHVERIFIED SOLUTIONS
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF CORRECT ANSWERS class IA and IV
List each of the major soil horizons CORRECT ANSWERS surface soil A, surface soil
B, and parent material
_____________ is a term describing the ability of water to migrate through a soil profile
under either _________ or __________ conditions. CORRECT ANSWERS Hydraulic
conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the soil at its
surface and migrate downward CORRECT ANSWERS air, water
List the four components of soil CORRECT ANSWERS air, water, organics, inorganics
A drainfield is 50 feet by 90 feet and must be covered with an average of 15 inches of
sand loam. How many cubic yards of sandy loam soil must be purchased (find the
volume of a rectangular object)? CORRECT ANSWERS 208.3 cubic yards
What would be the volume of a 5-foot-diameter pump tank that is 5 feet tall with the inlet
1 foot below the rim? CORRECT ANSWERS 587 gals
What would be the percent slope on a lot 250 feet deep that drops 20 feet in elevation
over the depth of the lot? CORRECT ANSWERS 8%
How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10 feet
wide, and 12 feet long with 18 inches of gravel? 1 cubic yard = 27 cubic feet.
CORRECT ANSWERS 6.67 cubic yards
A septic tank is 6 feet in diameter and is 8 feet deep. How many gallons will it hold if the
overflow line is located half way up from the bottom? CORRECT ANSWERS 846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE 2-39!!
CORRECT ANSWERS 1077gals
What is the surface area (area in square feet) of an evapotranspiration system 40 feet
wide and 65 feet long? CORRECT ANSWERS 2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of four sides.
CORRECT ANSWERS 1.5 acres
, Figure the area of a lot that measures 60ft by 280ft CORRECT ANSWERS
16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a ________.
CORRECT ANSWERS drip or spray irrigation
The primary treatment device providing the least or poorest treatment of domestic
wastewater would be _______. CORRECT ANSWERS septic tank
Nitrogen or nitrate removal in soil occurs by _________. CORRECT ANSWERS
vegetation uptake
The factors influencing the survival of bacteria in soil are _______. CORRECT
ANSWERS moisture, temperature, pH, and organic matter.
Physical removal of bacteria by straining occurs when _______. CORRECT ANSWERS
the bacteria are larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. CORRECT
ANSWERS suspended solid
Which of the following describes domestic wastewater as it leaves a home? CORRECT
ANSWERS fresh, light in color, has dissolved oxygen
Which of the following are problems caused by malfunctioning septic tank systems?
CORRECT ANSWERS surface water pollution, groundwater contamination, and
standing sewage in neighborhoods
An inorganic chemical that affects human health is CORRECT ANSWERS nitrate
Parasites (helminths) found in untreated sewage include ________. CORRECT
ANSWERS hookworm, round worms, and tapeworms
Viruses are responsible for such diseases as CORRECT ANSWERS poliomyelitis and
infectious hepatitis
A type of bacteria that indicates sewage contamination is ________. CORRECT
ANSWERS fecal coliform
Protozoa are very simple animal organisms that may cause ________. CORRECT
ANSWERS amoeba dysentery and Giardiasis
Waterborne diseases that spread by pathogenic bacteria include _________.
CORRECT ANSWERS typhoid, cholera, and dysentery
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