
Plumbing Basics Quiz
Authored by Stephen Wojcik
Science
1st - 2nd Grade

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11 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the standard rough-in measurement from the finished wall to the center of the toilet flange?
12 inches
15 inches
12.5 inches
18 inches
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How much clearance is required on either side of the toilet flange?
12 inches
15 inches
18 inches
21 inches
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the height above the finished floor for the water lines roughed in for the lav?
24 inches
21 inches
18 inches
15 inches
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What size is the trap adapter needed for the bathroom sink plumbing?
Three inches
One and a half inches
One inch
Two inches
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the exception to the rule that a drain cannot be reduced in size in the direction of flow?
Shower drains
Sink drains
Toilet drains
Bathtub drains
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What fitting is used to connect the toilet's trap arm into the main drain?
Three inch combo
Three inch santee
Four inch elbow
Four by three closet bend
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of a cleanout in plumbing?
To reduce water pressure
To provide access for maintenance
To increase water flow
To connect different drain sizes
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