Final answer:
True, fastening a solid plate that completely covers the bore and withstands the maximum pressure is a method to prevent leaks, forming a pressure-tight seal that adheres to Pascal's Principle.
Step-by-step explanation:
The statement that the absolute closure of a pipe, line, or duct by fastening a solid plate that completely covers the bore and is capable of withstanding the maximum pressure with no leakage beyond the plate is a method for preventing leaks is true. This technique ensures that pressure is maintained within the system, relying on principles like Pascal's Principle, which states that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid and to the container's walls. A properly installed solid plate, often referred to as a blind flange or blank flange, is designed to form a pressure-tight seal that prevents fluid or gas from passing beyond it, effectively becoming an end cap that secures the system.