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1. WHICH CHEMICAL SUBSTANCE IS USED TO REMOVE PERMANANT HARDNESS OF WATER
Answer: SODIUM CARBONATE
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MCQ-> In the following questions, you have a brief passage with 5 questions. Read the passage carefully and choose the best answer to each question out of the four alternatives.The problem of water pollution by pesticides can be understood only in context, as part of the whole to which it belongs – the pollution of the total environment of mankind. The pollution entering our waterways comes from many sources, radioactive wastes from reactors, laboratories, and hospitals; fallout from nuclear explosions; doemstic wastes from cities and towns; chemical wastes from factories. To these is added a new kid of fallout – the chemcial sprays applied to crop lands and gardens, forests and fields. Many of the chemical agents in this alarming melange initiate and augment the harmful effects of radiation, and within the groups of chemicals themselves there are sinister and little – understood interactions, transformations, and summations of effect. Ever since the chemists began to manufacture substances that nature never invented, the problem of water purification have become complex and the danger to users of water has increased. As we have seen, the production of these synthetic chemicals in large volume began in the 1940’s. It has now reached such proportion that an appalling deluge of chemical pollution is daily poured into the nation’s waterways. When inextricably mixed with domestic and other wastes discharged into the same water, these chemicals sometiems defy detection by the methods in ordinary use by purification plants. Most of them are so complex that they cannot be identified. In rivers, a really incredible variety of pollutants combine to produce deposits that sanitary engineers can only despairingly refer to as “gunk”.All the following words mean ‘chemicals’ except
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MCQ->In this question, a passage is given followed by a statement. Read the passage carefully and judge the statement based on the given passage.The strong olfactory sense elephants ar e known for has come as a blessing in disguise for the police in curbing illicit liquor trade in Uttarakhand’s Udham SinghNagar district. The animals find lahan, the substance used for brewing liquor, hidden in forests of Khatima in the district, and destroy them. Manufacturers brew it near nullahsdeep inside the forests or near the villages to avoid police raids as flowing water is required for fermentation.Lahan is sealed in barrels or polythene bags and buried for four to five days for fermentation. Elephants reach the spot by smelling the substance and destroy the barrels to consume the liquor, said Yogesh Upadhaya, inspector, Khatima police station. He said some traders keep the barrels on scaffoldings on trees but they are easily spotted by the police. “We have destroyed thousand litres of lahan in the past 23 months. They were stored in barrels on scaffoldings,” said Yogesh Upadhyay, inspector. “Miscreants place barrels of lahan on trees to keep them away from elephants. Elephants find them and destroy the barrels to consume the substance, causing heavy loss to the manufacturers,” he added. A villager, said: “The liquor is sold for Rs 80 to 100 per litre in villages. Since it is cheaper than liquor available in the market, people buy it even after knowing its impact on health. Elephants are playing vital role in curbing the trade.” Statement: Lahan is one of the costliest liquor that is available.Choose the appropriate one from the following options A The statement is definitely true. B The statement is probably true. C The statement cannot be determ ined. D The statement is definitely false....
MCQ->In this question, a passage is given followed by a statement. Read the passage carefully and judge the statement based on the given passage. The strong olfactory sense elephants ar e known for has come as a blessing in disguise for the police in curbing illicit liquor trade in Uttarakhand’s Udham SinghNagar district. The animals find lahan, the substance used for brewing liquor, hidden in forests of Khatima in the district, and destroy them. Manufacturers brew it near nullahsdeep inside the forests or near the villages to avoid police raids as flowing water is required for fermentation. Lahan is sealed in barrels or polythene bags and buried for four to five days for fermentation. Elephants reach the spot by smelling the substance and destroy the barrels to consume the liquor, said Yogesh Upadhaya, inspector, Khatima police station. He said some traders keep the barrels on scaffoldings on trees but they are easily spotted by the police. “We have destroyed thousand litres of lahan in the past 23 months. They were stored in barrels on scaffoldings,” said Yogesh Upadhyay, inspector. “Miscreants place barrels of lahan on trees to keep them away from elephants. Elephants find them and destroy the barrels to consume the substance, causing heavy loss to the manufacturers,” he added. A villager, said: “The liquor is sold for Rs 80 to 100 per litre in villages. Since it is cheaper than liquor available in the market, people buy it even after knowing its impact on health. Elephants are playing vital role in curbing the trade.” Statement: Police officially use elephants to stop illicit liquor trade.Choose the appropriate one from the following options A The statement is definitely true. B The statement is probably true. C The statement cannot be determ ined. D The statement is definitely false....
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