Water Pollution MCQs – CHAPTER 1 DAE

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1. . Key issues for sampling of sewage is





2. . The crucial days for testing of BOD for sewage is





3. . Burning of fossil fuel causes increased





4. . The duty of Environmental Technologists is to protect and present





5. . The study of Interrelationship between environment and animals





6. . Important components of an ecosystem are





7. . Indiscriminate cutting or over harvesting of trees for timber or pulp, or to clear for agriculture, ranching, construction or other human activities





8. . Pesticides are harmful to





9. . Industrial wastewater or sewage when enters in a river, storm or sea is termed as





10. . Presence of Algae in water may cause





11. . Colour, taste, odour and temperature are





12. . Presence is a serious biological pollution indicator of water





13. . Settleable solids could be measured by using





14. . The minimum limiting value of dissolved oxygen in stream water is





15. . Standard pH value for drinking water is





16. . Chemical coagulation is done by using chemicals





17. . Disinfection of water is done by





18. . Organic matters are regarded as





19. . Turbidity in water is due to





20. . Quantity of oxygen required for stabilization of the oxidizable organic matter present over 5 days of incubation at 20°C is called





21. . If the wastewater is biodegradable it is subjected to biodegradation usually of





22. . Bar screens provide the removal of





23. . Grit removal devices rely on specific gravity between organic and inorganic solids to affect their representation





24. . Method used for the removal of suspended solids, oil & grease from the wastewater





25. . Treatment often called clarification, sedimentation or settling





26. . The bacteria which comes into action in the presence of free oxygen and light is called





27. . Odour of the sewage is an indicator of





28. . Activated sludge contains water up to





29. . Sunlight may help in sewage





30. . Filter media in trickling filter is generally of





31. . Chlorination of sewage may





32. . PH value for neutralization of domestic sewage is





33. . Thermophilic digestion is completed in





34. . Retaining period of water in septic tank / collection tank is known as





35. . Bacteria which digest organic and inorganic matter in a septic tank / collection tank is termed as





36. . No treatment is necessary and raw sewage can directly be discharged into the volume of dilution water if dilution factor is





37. . Sewage should be completely treated before it is thrown into water for dilution if dilution factor is





38. . Free board in a sewage tank is normally





39. . The most desirable way of sludge treatment is





40. . Sprinkler irrigation is a method of applying sewage where





41. . Polluted gases are exhausted by





42. . Large particle collection in a sewage tank is termed as





43. . Free ammonia in the sewage is an indicator of





44. . Protein is a main component of





45. . Contact bed is permitted to stay empty for a period of





46. . Intermittent sand filters are kept wet to keep the conditions





47. . Settling tank is used for





48. . Colour, odour, temperature & turbidity test





49. . Consist of fixed screen and a moving cutter for reducing the size of waste particles





50. . Branches of biochemistry is





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