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HOME > Continuing Education > Quiz #3

JEH Quiz #3 (December 2011)

Featured Article:
"Impacts of Biological Additives, Part 1:
Solids Accumulation in Septic Tanks"

Available to NEHA members only, the JEH Quiz, offered six times per calendar year through the Journal of Environmental Health, is a convenient tool for self-assessment and an easily accessible means to accumulate continuing-education (CE) credits toward maintaining your NEHA credentials.

It's a simple process...

Read the featured article in the Journal.
Select the correct answer to each JEH Quiz question and click on the Submit button at the bottom of the page.
One CE credit will be applied to your account with an effective date of December 1, 2011 (first day of issue).
Check your continuing education account online.

Quiz deadline: March 1, 2012

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1.	__% of existing housing and __% of new housing in the U.S. use septic systems.
	a.	33, 25
	b.	25, 75
	c.	25, 33
	d.	10, 15
2.	Holding times are typically designed to be __ in septic tanks.
	a.	24 to 36 hours
	b.	two to four days
	c.	two to four weeks
	d.	three to five days
3.	The septic tank serves as a wastewater retention and solids digestion suboxic or anoxic chamber.
	a.	True.
	b.	False.
4.	In their study, the authors examined
	a.	solids buildup in septic tanks.
	b.	solids breakdown in septic tanks.
	c.	sludge and scum accumulation in septic tanks.
	d.	all of the above.
5.	The poorly maintained septic tanks in the authors’ study had not been pumped in
	a.	5–10 years.
	b.	10–15 years.
	c.	15–20 years.
	d.	20–25 years.
6.	Distribution of the additive treatments followed a __ approach.
	a.	double-blind
	b.	convenience-sample
	c.	population-based
	d.	single-blind
7.	The 48 experimental units averaged 29.0 cm total solids (combined sludge and scum) __ the additive experiment.
	a.	before.
	b.	during.
	c.	after.
8.	While the F-test for the main sludge depth treatment effect was not significant, the effects of the covariate and the effects of time were statistically significant.
	a.	True.
	b.	False.
9.	Dunnett’s t-tests performed at an α = .05 level indicated that additive 2 and additive 3 sludge depths were significantly different (i.e., less) than the control, which is a __ result.
	a.	negative.
	b.	neutral.
	c.	positive.
10.	The authors found that sludge depths were not consistently reduced due to additive usage when compared to the control.
	a.	True.
	b.	False.
11.	The overall sludge accumulation throughout the study period ranged from __ cm to __ cm among the tanks.
	a.	–10.0, +3.0
	b.	+16.0, +54.0
	c.	+3.0, +7.0
	d.	–16.0, +34.0
12.	The authors recommend field assessment of sludge depth and scum thickness every __ years to determine the ideal time for pumping accumulated solids from individual septic tanks.
	a.	1-2
	b.	2-3
	c.	5-7
	d.	9-10