Q. Which sewage contains biodegradable waste such as organic matter? Medical wastePlastic wasteDomestic wasteWild waste Answer: Domestic waste

Q. Who is responsible for the degradation of biodegradable organic matter present in the domestic sewage? AnimalsHumansPlasticBacteria and other microbes Answer: Bacteria and other microbes

Q. Which materials are hard to remove from the polluted water? SandPlasticSolidsDissolved salts Answer: Dissolved salts

Q. Which materials are easily removed from the polluted water? LiquidSolidsDissolvedNutrients Answer: Solids

Q. How much percent of impurities are enough to make domestic sewage unfit for humans? 0.1 percent1 percent5 percent10 percent Answer: 0.1 percent

Q. Which of the following are the dissolved materials present in domestic sewage? SandClayNutrientsBacteria Answer: Nutrients

Q. Which of the following are the colloidal materials present in domestic sewage? CalciumSandAmmoniaFecal matter Answer: Fecal matter

Q. Which of the following are the suspended solids in the domestic sewage? AmmoniaSandCalciumBacteria Answer: Sand

Q. When the government of India did pass the Water (Prevention and Control of Pollution) Act? 1999197418962010 Answer: 1974

Q. Which of the following metal is a water pollutant and causes sterility in human being? AsMnMgHg Answer: Mn