Bio-chemical oxygen demand (B.O.D.) of safe drinking water must be

Related MCQs

• The percentage ratio of the oxygen available in sewage to the oxygen required to satisfy one stage of bio-chemical oxygen demand (B.O.D.) is termed as
• In orthotolodine test, safe residual for drinking water is indicated by
• The amount of oxygen required for the biological decomposition of dissovled organic solids to occur under aerobic conditions is called bio-chemical oxygen demand (B.O.D.)
• The maximum permissible hardness in water for drinking purposes should not exceed 100 ppm.
• The most commonly used disinfectant for drinking water throughout the world is
• The natural process in which the oxygen of water of streams is consumed by sewage and at the same time, it is replenished (filled again) by the atmosphere, is known as
• The minimum dissolved oxygen required in water to save the aquatic life is
• In designing a water works for a city to meet the water demand for public use, a provision of about
• The bacteria which require oxygen for their survival is known as
• The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termd as