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

Q. Which of the following is a main factor of water pollution? Commercial production Windmill Smoke and ammonia Detergents Answer: Detergents

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

Q. Which of the following is a water polluting factor? Smoke Industrial waste Detergent Ammonia Answer: Industrial waste

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

Q. Polluted water can be purified by using Micro-organisms Algae Pesticides Fishes Answer: Micro-organisms

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

Q. Which of the following is biodegradable pollutant? Sewage Plastic Polythene DDT Answer: Sewage

Q. The most common indicator organisms that represent polluted waters is E. Coli S. Typhi C. Vibrio Entamoeba Answer: E. Coli

Q. One of the following is the chief source of water and soil pollution Agro industry Mining Thermal power stations All of these Answer: All of these