Free Practice Test
Free Journeyman Plumber Practice Test
Take this free 10-question IPC/UPC topic set as independent supplemental practice. No signup required. See your score instantly, then verify every code reference against the edition and rules named by your licensing authority.
Jurisdiction and source checkpoint
Which Journeyman Plumber route are you taking?
There is no national exam form. Confirm jurisdiction, credential, issuer, portions, code edition, and allowed references before treating practice as aligned. This choice is additive and does not replace lesson, flashcard, test, Pathway, weak-area, missed-question, score, or exam-date progress.
Zero-admission boundary
Texas/Massachusetts aligned admissions: 0 / 597 — 520 prompts, 5 lessons, and 72 flashcards all remain mixed supplemental material until every item has a complete source, ownership, license, and human-review record.
Exam-format boundary
Confirm the issuer before you build your study plan
There is no verified national question count, time limit, code edition, or open-book rule in the two issuer sources below. Texas currently identifies a Pearson VUE computer-based component followed by a practical exam when applicable. Massachusetts requires Board approval before PSI schedules the exam. Use your current licensing-board instructions or candidate bulletin for the exact format, adopted code, amendments, and allowed references.
Sources checked October 13, 2026.
Journeyman Plumber · Question 1 of 10
According to the IPC, what is the drainage fixture unit (DFU) value for a residential water closet (1.6 gpf or less)?
Pick an answer to see the explanation + an instant AI breakdown.
The ten-question widget and ten static questions are unreviewed discovery content. They make zero Texas or Massachusetts jurisdiction-coverage claims.
10 Free IPC/UPC Practice Questions
Q1. What is the minimum slope required for a 2-inch horizontal drain pipe?Show answer
✓ Correct Answer: 1/4 inch per foot
The IPC requires a minimum slope of 1/4 inch per foot (2%) for horizontal drain pipes 2-1/2 inches and smaller, and allows 1/8 inch per foot for 3 to 6 inch pipe. The UPC uses a similar rule; confirm the slope table in your adopted code.
Q2. What is the maximum horizontal distance allowed for a P-trap arm on a 1.5-inch drain?Show answer
✓ Correct Answer: 42 inches
Per the IPC, the maximum trap arm length for a 1.5-inch drain is 42 inches, but the practical maximum for code compliance without venting issues is typically 24–42 inches depending on jurisdiction.
Q3. A water heater pressure relief valve discharge pipe must terminate:Show answer
✓ Correct Answer: Within 6 inches of the floor
The IPC requires the T&P relief valve discharge pipe to terminate no more than 6 inches above the floor, into a drain, or to an indirect waste receptor to prevent scalding.
Q4. What is the minimum pipe size for a building sewer?Show answer
✓ Correct Answer: 4 inches
Per the IPC, the minimum diameter for a building sewer (the pipe running from the building to the public sewer) is 4 inches.
Q5. Which of the following materials is NOT approved for potable water supply piping?Show answer
✓ Correct Answer: ABS
ABS (Acrylonitrile Butadiene Styrene) is approved for DWV (drain, waste, vent) applications only — it is not approved for potable water supply piping. Copper, PEX, and CPVC are all used for water supply.
Q6. How many fixture units can a 3-inch stack carry?Show answer
✓ Correct Answer: 48 DFUs
Per IPC Table 710.1(1), a 3-inch drainage stack can carry 48 drainage fixture units (DFUs). This is a commonly tested calculation on the journeyman plumber exam.
Q7. A dishwasher drain must discharge through which device to prevent backflow?Show answer
✓ Correct Answer: An air gap
The IPC requires dishwasher drains to discharge through an air gap or connect to the high side of the garbage disposer to prevent contaminated water from siphoning back into the dishwasher.
Q8. What is the minimum clearance from the centerline of a toilet to a side wall or obstruction?Show answer
✓ Correct Answer: 15 inches
The IPC requires a minimum of 15 inches from the centerline of a water closet to any side wall or obstruction. Many jurisdictions follow the IRC which requires 15 inches as well.
Q9. Which type of pipe joint is required when connecting copper to galvanized steel pipe?Show answer
✓ Correct Answer: Dielectric union
A dielectric union is required when connecting copper and galvanized steel pipe to prevent galvanic corrosion, which occurs when dissimilar metals contact each other in a water system.
Q10. A wet vent must be sized for:Show answer
✓ Correct Answer: The total DFUs of all fixtures served
A wet vent must be sized for the total drainage fixture units of all the fixtures it serves, per IPC wet vent sizing tables. The minimum wet vent size is 2 inches but must be larger if DFU load requires it.
What Does the Journeyman Plumber Exam Cover?
This practice set covers IPC/UPC topics such as drainage, waste, and vent systems; water supply; fixture-unit calculations; traps and venting; backflow prevention; water heaters; and pipe materials. It is not an exam outline. Your licensing authority or testing provider controls the topics, adopted code edition, amendments, references, and test rules for your exam.
How Hard Is the Journeyman Plumber Exam?
Difficulty cannot be reduced to one national pass-rate or format statement. Use the current instructions for the jurisdiction where you are applying, then practice locating rules and tables in the exact code edition permitted for that exam. Your score on this ten-question set identifies topics to review; it does not predict a licensing result.
How to Study for the Journeyman Plumber Exam
- 1.Know your state's code. Verify whether your state uses IPC or UPC, and check for state-specific amendments.
- 2.Drill DFU tables daily. Practice reading fixture-unit and pipe-sizing tables in the exact code edition named by your issuer.
- 3.Use timed code lookups. Match the time and reference rules in your current candidate instructions; this set does not reproduce a licensing exam.
- 4.Use Plumber Prep by VoltExam. Practice IPC/UPC questions on the web, review explanations, and use the DFU calculator for sizing drills.
Frequently Asked Questions
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