Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?

A. Active carbon
B. Silica gel
C. Bog iron (iron oxide)
D. Pulverised limestone

A. Biological oxygen pond
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Lagoons
D. Filtration

A. Blood poisoning
B. Anaemia
C. Nervous system disorder
D. All A., B. and C.

A. Hydrochloric acid
B. Lime
C. Copper sulphate
D. Sodium sulphate

A. Phenol and cyanide
B. Chlorine
C. Alkalis
D. Suspended solids

A. Foul smell and taste
B. Iron and manganese
C. Temporary hardness
D. Permanent hardness