Q. Water pollution can be stopped best by Treating effluents to remove injurious chemicals Rearing more fishes Cultivating useful water plants Spraying with DDT Answer: Treating effluents to remove injurious chemicals
Q. When Chloride is added to sewage both at the beginning as well as at the end of the treatment process, the phenomenon is called: Post chlorination Super chlorination Split chlorination None of these Answer: Split chlorination
Q. In the treatment of waste water discharge, which treatment stage involves biological treatment Primary treatment Secondary treatment Tertiary treatment Reverse osmosis stage Answer: Secondary treatment
Q. Thermal pollution of water bodies is due to Discharge of heat (hot water) from power plants Discharge of chemicals from industries Discharge of waste from mining Discharges of agricultural run off Answer: Discharge of heat (hot water) from power plants
Q. Water pollution is caused due to Sewage and other wastes Industrial effluents Agricultural discharges All of these Answer: All of these
Q. The BOD removal in an oxidation pond may be up to 100% 97% 94% 90% Answer: 90%
The BOD removal in an oxidation pond may be up to Read More »
Q. Sewage water can be purified for recycling with the action of Aquatic plants Penicillin Micro-organisms Fishes Answer: Micro-organisms
Sewage water can be purified for recycling with the action of Read More »
Q. Who was the first to recognise the problem of water pollution ? Airstotle Theophrastus Hippocrates Thales Answer: Hippocrates
Who was the first to recognise the problem of water pollution ? Read More »
Q. Which of the following is a main factor of water pollution? Commercial production Windmill Smoke and ammonia Detergents Answer: Detergents
Which of the following is a main factor of water pollution? Read More »
Q. What is the full form of BOD? Biological Ozone Demand Biological Oxygen Demand Biotic Oxygen Demand Biological Oxygen Deficiency Answer: Biological Oxygen Demand
