Question

Unwanted sound is called _____.

• A. Echo
• B. Noise
• C. Vibration
• D. Decibel

Answer 1

The correct option is B

Noise

The explanation for the correct option:

Option B: Noise

1. A sound, particularly one that is loud, and uncomfortable, usually creates disruption is called noise.
2. Sound becomes unwelcome when it interrupts with typical activities such as napping, resting, or speaking, and whenever it interrupts or reduces one's quality of life.
3. The unwanted sound suggests that noise is only a bother, dismissing what is currently known about noise's negative impacts.

The explanation for the incorrect options:

1. In the case of option A, a sound or series of sounds produced by the reflection of sound waves of a surface back towards the observer or audience is called an echo.
2. In the case of option C, an entity's mechanical oscillations about an equilibrium position are called vibration.
3. In the case of option D, the unit of measurement for expressing the comparison between two physical quantities, often levels of electric power, perhaps for quantifying the comparative intensity of sounds is called the decibel.

Therefore, option B is the correct answer.