Heavy metals
Faecal matter
Industrial effluents
Pollen of aquatic plants
A full wave rectifier circuit with diodes (\(D_1\)) and (\(D_2\)) is shown in the figure. If input supply voltage \(V_{in} = 220 \sin(100 \pi t)\) volt, then at \(t = 15\) msec: 
The following are the major sources of Water Pollution: