Red Seal Plumbing Practice Exam

The presence of water inside a fixture or on the floor around a trap is evidence that what has occurred?

1. Poor installation

2. Back pressure

3. Evaporation

4. Leakage

The correct answer is: Back pressure

If you see water inside or around a plumbing fixture, it is a sign that back pressure has occurred. This refers to a situation where there is a higher pressure in the pipes than normal, causing water to flow out of the fixture or trap instead of down the drain. Option A (poor installation) is incorrect because even a properly installed fixture can experience back pressure. Option C (evaporation) is also incorrect because evaporation would not result in water being present around or inside the fixture. Option D (leakage) is incorrect because leakage would involve consistent or intermittent water flow, rather than a build-up of water.