Q. Water pollution is caused due to Sewage and other wastesIndustrial effluentsAgricultural dischargesAll of these Answer: All of these

Q. The BOD removal in an oxidation pond may be up to 100%97%94%90% Answer: 90%

Q. Sewage water can be purified for recycling with the action of Aquatic plantsPenicillinMicro-organismsFishes Answer: Micro-organisms

Q. Who was the first to recognise the problem of water pollution ? AirstotleTheophrastusHippocratesThales Answer: Hippocrates

Q. Which of the following is a main factor of water pollution? Commercial productionWindmillSmoke and ammoniaDetergents Answer: Detergents

Q. What is the full form of BOD? Biological Ozone DemandBiological Oxygen DemandBiotic Oxygen DemandBiological Oxygen Deficiency Answer: Biological Oxygen Demand

Q. Which of the following is a water polluting factor? SmokeIndustrial wasteDetergentAmmonia Answer: Industrial waste

Q. Biological Oxygen Demand (BOD) is a measure of Industrial wastes poured into water bodiesExtent to which water is polluted with organic compoundsAmount of carbon monoxide inseparably combined with haemoglobinAmount of oxygen needed by green plants during night Answer: Extent to which ...

Q. Polluted water can be purified by using Micro-organismsAlgaePesticidesFishes Answer: Micro-organisms

Q. B.O.D. test or biological oxygen demand test is made for measuring Air pollution(b)Water pollutionNoise pollutionSoil pollution Answer: Water pollution