Final answer:
The correct way to pinpoint leaks in a pressurized system is by using soapy water, which reveals the location of the leak through bubble formation.
Step-by-step explanation:
The correct answer is option c) Soapy water. To pinpoint leaks in a system, such as an air compressor or any pressurized vessel, a common and effective method involves using soapy water.
When the soapy water is applied to the surface of the system, any escaping air will cause the formation of bubbles at the leak point, providing a visual indication of where the system is compromised.
Although applying air pressure (option d) is essential to create a situation where leaks can be detected, it is not a direct method for pinpointing the location of leaks.
Cardboard or a carpenter's square (options a and b, respectively) are not related to the process of leak detection.
The correct answer is option c) Soapy water. Soapy water is often used to pinpoint leaks in various systems, including plumbing and gas lines. When a soapy water solution is applied to a potential leak area, such as a pipe joint or connection, the presence of a leak will cause the formation of bubbles.