PLUMBING Exam Practice 



1. How much does a full 50-gallon water heater weigh? (assume the heater weighs 210 lbs. empty)


2. You are trying to locate the restroom wall that will receive the plumbing waste pipes. You refer to the plumbing drawing and note the scale is ⅛ of an inch per foot. Your ruler measures a length of 14 ¼ inches and your scale indicates ⅛ per foot fall. What is the length of the wall?


3. You have an offset of 24 inches and you are making a 45° offset. What is the travel length?


4. You are figuring the free area of the opening needed to supply the combustion air to a water heater in an enclosure. The opening you have installed communicates freely with the outdoors. What is the minimum size in square inches of the opening needed to supply each 3000 btus of the heater?


5. When water pressure being supplied to a single-family residence is in excess of psi a pressure reducing valve is required to be installed to reduce the pressure to a level below the maximum allowable pressure.


6. Which of the following is true about vents and indirect waste piping?


7. Your job has you roughing in plumbing for a public restroom. The general contractor wants you to install two toilets, one urinal, one shower and one drinking fountain in the restroom for males. The female bathroom will not have a urinal, but it will require a bidet. Which of the following is not allowed to be installed in a public restroom?


8. Spencer is installing a new plumbing system. The building drain will exit the foundation below a concrete footing. Foundation walls are to be made of poured concrete. The plans and specifications call for three exterior hose bib connections. This will require three piping penetrations through the upper section of the concrete walls on each side of the building and one pipe penetration through the wall on a lower section where the walk-out basement will not be back filled as high as it will be on the sides. There will be a total of four pipe penetrations in various locations. Each pipe is required to be protected by a sleeve as the pipe penetrates an exterior wall. What is the minimum size of the sleeve required or the minimum protection for the penetration?


9. Consider this example. Jeff is a master plumber. He has been asked to provide plumbing for a warehouse that will be located in an area subject to flooding. The warehouse will have a concrete floor and will have only one level of service area. Most of the plumbing will be installed below the concrete floor. Given the risk of potential flooding, Jeff is required to protect against which of the following?


10. When plumbing inspectors are inspecting the installation of plumbing fixtures they may consider which of the following in their decisions to approve or reject an installation?



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Download more than 600 PLUMBING practice questions and answers that are similar to the actual test. Good luck on your exam! 

What Is the Plumbing Exam?

The Plumbing Exam is used to ensure a test takers competence in the work that they will be doing. In order to be licensed as a Plumber, you must meet your state’s standards


A Master Plumber may install, change, repair, service, or renovate plumbing under the supervision of a Responsible Master Plumber.

The Journeyman Plumber Exams are a group of state-specific examinations that are used to determine whether or not an individual possesses the skills and knowledge necessary to work as a certified or licensed plumber at the journeyman level within a particular state.

What Does the Plumbing Exam Cover?

On this exam you will find questions related to and about the following subjects:

  • Plumbing Fixtures, Fittings, and Appliances
  • Water Supply Systems
  • Indirect Waste
  • Drainage, Waste, and Vents
  • Roof Drain Piping
  • Specialty Plumbing
  • General Plumbing Knowledge and Regulations
  • Isometric Analysis
  • Safety
  • Traps, Interceptors, and Backflow Prevention
  • Materials, Uses, and Specifications
  • Business Organization and Management


Test vary widely, but most states have the following categories on a plumbing license exam:
  • Codes – Most states have adopted either the IPC (International Plumbers Code) or UPC (Uniform Plumbers Code) plumbing codes, but you may also need to know the National Fuel Gas Code or Uniform Mechanical Code
  • General Knowledge – General knowledge includes a wide range of topics such as design and installation, workplace safety, and basic electricity concepts.
  • Math & Plans – You’ll need real-world math skills and a thorough math foundation for the daily aspects of this career so you can expect to be tested on basic pipe length calculations and broad based understanding of physics, volume and pressure.
  • Pipefitting – You’ll definitely need to know the use and inspection of basic equipment and hardware, as well as the basic layout and installation of pipe.