Which of the following is a major factor in water pollution?

Domestic and hospital sewage often contains many undesirable pathogenic microorganisms. If discharged into water bodies without proper treatment, which of the following diseases can be caused?
$I-$ Dysentery or Diarrhoea
$II-$ Typhoid
$III-$ Hepatitis
$IV-$ Cancer
$V-$ Cholera
$VI-$ $AIDS$

When a huge amount of sewage is dumped into a river,the $BOD$ will

Match the following impurities in water with their respective categories:

Column-$I$	Column-$II$
$(P)$ Suspended solids	$(I)$ Fecal matter, bacteria, cloth and paper fibers
$(Q)$ Colloidal materials	$(II)$ Sand, silt, and clay
$(R)$ Dissolved materials	$(III)$ Nutrients (nitrate, ammonia, phosphate, sodium, calcium)

The Government of India passed the Water (Prevention and Control of Pollution) Act in the year $........$.

Water pollution is caused by