According to the text, what is one of the general powers of the Board?

Taking testimony under oath is one of the general powers of the Board because it allows the Board to gather factual information and evidence in a formal and legally binding manner. This process is crucial for ensuring that the Board can make informed decisions based on accurate and truthful accounts related to code enforcement. By administering oaths, the Board emphasizes the seriousness of the testimony being provided, which can lead to more reliable and credible information as it relates to compliance with local ordinances and regulations.

In contrast, while investigating city ordinances may be part of the Board's responsibilities, it does not specifically encapsulate the power of taking testimony. Establishing new laws typically falls outside the scope of a Board's authority, as that power is generally reserved for legislative bodies. Similarly, enforcing the state constitution is primarily the role of law enforcement agencies and courts, rather than a Board focused on code enforcement matters.