Challenge Your Exam Readiness With Our Free Master Plumber Practice Questions

The volume of a cylinder is calculated using the formula V = πr²h. Here, the radius (r) is half the diameter: 4 ÷ 2 = 2 meters. Substituting values: V = 3.1416 × (2²) × 6 = 75.398 cubic meters. One cubic meter equals 1,000 liters, so 75.398 m³ equals 75,398 liters. However, practical exams often test for rounding errors and common distractors. Reviewing choices, the correctly rounded figure closest to the actual answer is 75,398 liters (A), not D. This highlights the importance of accuracy in conversions, as plumbing arithmetic often involves volume calculations for tanks, pipes, or systems. In practice, incorrect calculation may lead to under- or over-sizing a storage tank, which affects water supply efficiency. Candidates should remember to check unit conversions carefully, especially cubic meters to liters. These types of computational problems reflect the core responsibility of plumbers in ensuring water systems meet design specifications.