Question

Noise can be defined as

• A. Loud sound
• B. Unwanted sound
• C. Constant sound
• D. Sound of high frequency

Answer 1

Answer: (B)

Unwanted sound

Noise is unwanted sound judged to be unpleasant, loud or disruptive to hear. From a physics standpoint, noise is indistinguishable from sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound.

Acoustic noise is any sound in the acoustic domain, either deliberate (e.g., music or speech) or unintended. In contrast, noise in electronics may not be audible to the human ear and may require instruments for detection.

So the correct answer is 'Unwanted sound'.