Which statement about background noise on a sound-powered line is true?

• A. It can mask speech, reducing intelligibility.
• B. It is irrelevant to operation.
• C. It always improves accuracy.
• D. It can be ignored during operation.

Answer: (A)

Background noise on a sound-powered line reduces intelligibility by masking the spoken message. With no powered amplification, the listener relies on the caller’s voice being clear enough to rise above the ambient sounds. When noise competes with the signal, the words become harder to distinguish, which can lead to miscommunication—especially in fast-paced or safety-critical situations. To cope, speak clearly, enunciate, and face the listener, and try to minimize competing noises where possible.

The other statements aren’t accurate: noise isn’t irrelevant to operation, it doesn’t improve accuracy, and it shouldn’t be ignored during use, because ignoring it directly hampers reliable communication.