The presence of bacteria in water causes

Related MCQs

• The presence of calcium and magnesium bi-carbonates in water causes hardness in the water.
• Bacteria which can survive with or without free oxygen is known as facultative bacteria.
• The presence of calcium and magnesium chloride in water causes
• The presence of hydrogen sulphide in water causes
• The presence of carbon dioxide in water causes acidity.
• B-coli or E-coli are harmless organisms but their presence in water indicates the
• Calcium sulphate present in water causes corrosion.
• The bacteria which require oxygen for their survival is known as
• The seqage is treated by aerobic bacteria action in
• The bacteria which can survive without oxygen is called