Sources Of Water Pollution. 1  Dumping of industrial wastes, containing heavy metals, harmful chemicals, by-products, organic toxins and oils, into the nearby source of water is one of the visible causes of water pollution.  Another cause for the contamination of water is the improper disposal of human and animal wastes.
Also see audio noise. Noise is unwanted electrical or electromagnetic energy that degrades the quality of signals and data. Noise occurs in digital and analog systems, and can affect files and communications of all types, including text, programs, images, audio, and telemetry.
Related Terms. 1  1. Communication: Anything that interferes with, slows down, or reduces the clarity or accuracy of a communication. Thus, superfluous data or words in a message are noise because they detract from its meaning. 2. Quality control: Variability that may be caused by changes in the ambient conditions, faulty machine performance, or uneven quality of the material or human factor inputs.