This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Wastewater Story > Class 7 Science Chapter 13 Wastewater Story – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 13 Wastewater Story Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease? A) Dysentry. B) Typhoid. C) Cholera. D) Asthma. Show Answer Correct Answer: D) Asthma. 2. Which is the quality of water waste? A) Dirty look. B) Foul smell. C) Mixed with lather. D) All of these. Show Answer Correct Answer: D) All of these. 3. Why should the waste from humans should be treated properly? A) The epidemics can break out. B) It can cause diseases. C) All of these. D) None of the above. Show Answer Correct Answer: C) All of these. 4. We can improve the process of treating the sewage by working together. A) No. B) Yes. C) All the above. D) None of the above. Show Answer Correct Answer: B) Yes. 5. Dried ..... is used as manure A) Slury. B) Sewage. C) Sand. D) Sludge. Show Answer Correct Answer: D) Sludge. 6. The process of removing pollutants in water before it enter a water body is called A) Cleaning of water. B) Refining. C) Filtering of water. D) None of these. Show Answer Correct Answer: A) Cleaning of water. 7. EXCRETA FROM TOILET SEATS FLOW THROUGH COVERED DRAINS INTO A ..... A) NONE OF THESE. B) BIOGAS. C) BIOGAS PLANT. D) ALL OF THESE. Show Answer Correct Answer: C) BIOGAS PLANT. 8. Floating impurities (such as grease and oils) in the sedimentation tank are removed by A) Skimmer. B) Screens. C) Floater. D) Cleaner. Show Answer Correct Answer: A) Skimmer. 9. The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as A) Sewers. B) Transport system. C) Treatment plant. D) Playage. Show Answer Correct Answer: D) Playage. 10. Which of the following is wastewater? A) Water coming out of a shower. B) Water coming out of laundry. C) Water trickling from a damaged tap. D) Water flowing in a river. Show Answer Correct Answer: B) Water coming out of laundry. 11. ACTIVATED SLUDGE IS MADE IS ABOUT ..... OF WATER A) 38%. B) 62%. C) 47%. D) 97%. Show Answer Correct Answer: D) 97%. 12. Dried sludge is used as ..... A) Manures. B) Electricity. C) Energy. D) Sludge. Show Answer Correct Answer: A) Manures. 13. Which of these particles is NOT able to pass through a sand, gravel, and charcoal filter? A) Bacteria. B) Large piece of dirt. C) Water. D) Viruses. Show Answer Correct Answer: B) Large piece of dirt. 14. Suspended impurities contained by sewage are called A) Contaminants. B) Sludge. C) Grey water. D) None of these. Show Answer Correct Answer: A) Contaminants. 15. The process of removing pollutants in water before it enters a water body or reused. A) Refining. B) Filtering of water. C) Cleaning of water. D) None of these. Show Answer Correct Answer: C) Cleaning of water. 16. How many minutes did Bacteria and E.coli reproduces? A) 10 and 19. B) 2 and 5. C) 9.5 and 20. D) 3.6 and 4.5. Show Answer Correct Answer: C) 9.5 and 20. 17. Solid waste extracted in sewage treatment A) Human waste. B) Animal waste. C) Both a and b. D) None of these. Show Answer Correct Answer: C) Both a and b. 18. What gas must be maintained at precise levels in the aeration tank? A) CO$_{2}$. B) O$_{2}$. C) H$_{2}$. D) CO. Show Answer Correct Answer: B) O$_{2}$. 19. Sludge in separate tanks is decomposed to get biogas by A) Yeasts. B) Aerobic bacteria. C) Anaerobic bacteria. D) None of these. Show Answer Correct Answer: C) Anaerobic bacteria. 20. In a filtration, plant water is filtered using layers of A) Sand and clay. B) Clay and fine gravel. C) Sand and fine gravel. D) Sand, fine gravel and medium gravel. Show Answer Correct Answer: D) Sand, fine gravel and medium gravel. 21. The anaerobic bacteria releases ozone gas A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 22. NAME A LIQUID WASTE A) SLUDGE. B) SKIMMER. C) SEWAGE. D) SEWER. Show Answer Correct Answer: C) SEWAGE. 23. Water that is not fit for use is called A) Clean water. B) Wastewater. C) Both (a) and (b). D) None of these. Show Answer Correct Answer: D) None of these. 24. The cutting of the desired plant is called? A) Scion. B) Fragments. C) Cell. D) Stock. Show Answer Correct Answer: A) Scion. 25. The inorganic impurities in wastewater A) Nitrates. B) Phosphates. C) Metals. D) All of above. Show Answer Correct Answer: D) All of above. 26. Which one is the characteristic of wastewater? A) Does not contain pathogenic micro-organisms. B) Safe to health. C) Used water from residential, commercial, and industrial areas. D) Free from breeding sites for insects, pests and micro organism. Show Answer Correct Answer: C) Used water from residential, commercial, and industrial areas. 27. A word related to hygiene A) Sanitation. B) Sanitization. C) Chlorination. D) None of these. Show Answer Correct Answer: A) Sanitation. 28. Which of the following is a part of inorganic impurities of the sewage? A) Urea. B) Pesticides. C) Phospates. D) Vegetable waste. Show Answer Correct Answer: C) Phospates. 29. When is the world water day celebrated? A) 13 september. B) 2 october. C) 22 march. D) None of the above. Show Answer Correct Answer: C) 22 march. 30. Flower consisting of both the male and female reproductive organs are called A) Callus. B) Vegetative propagation. C) Hermaphrodite. D) Zygote. Show Answer Correct Answer: C) Hermaphrodite. 31. Organic impurities contain- A) Human faeces, animal waste, oil, urea. B) Nitrates, phosphorus, metals. C) Vibro cholera. D) None of the above. Show Answer Correct Answer: A) Human faeces, animal waste, oil, urea. 32. What are the onsite sewage disposal system for human waste A) Septic tanks. B) Composting pits. C) Vermi-composting toilets. D) All of these. Show Answer Correct Answer: D) All of these. 33. Protozones causes ..... A) Typhoid. B) Cholera. C) Dysentery. D) All of the above. Show Answer Correct Answer: C) Dysentery. 34. Large objects like rugs, napkins, plastic bags are removed by using? A) Bar screens. B) Sludge. C) Aeration. D) None of the above. Show Answer Correct Answer: A) Bar screens. 35. Which one of the following is used in vermi processing toilets A) Earthworm. B) Cockroach. C) Both of these. D) None of the above. Show Answer Correct Answer: A) Earthworm. 36. Which toilet in which human excreta is converted to vermi cakes by earthworms is called? A) Portable toilets. B) Gravity-flush toilets. C) Vermi-composting toilets. D) Composting toilets. Show Answer Correct Answer: C) Vermi-composting toilets. 37. When the male and female flowers are borne by different plants, these are called? A) Monoecious plant. B) Dioecious plant. C) Binary fission. D) Union of egg. Show Answer Correct Answer: B) Dioecious plant. 38. Which of the following is/are products of wastewater treatment? A) Biogas. B) Sludge. C) Both biogas and sludge. D) Aerator. Show Answer Correct Answer: C) Both biogas and sludge. 39. ..... is a process of removing pollutants before it enters a water body or is reused. A) Cleaning of water. B) Drinking. C) Water for life. D) None of these. Show Answer Correct Answer: A) Cleaning of water. 40. Which process removes the solid like and faeces and other substances from the waste water A) Chlorination. B) Decomposition. C) Evaporation. D) Sand and grit removal. Show Answer Correct Answer: D) Sand and grit removal. 41. Wastewater cannot be reused. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 42. Advantages of Sewage System A) The domestic sewage treatment plant needs to be runningsteadily to be effective. B) The sewerage system provides a healthier and more appropriate way to manage liquid wastes. C) The sewerage system provides a healthier and more appropriate way to manage solid wastes. D) None of the above. Show Answer Correct Answer: B) The sewerage system provides a healthier and more appropriate way to manage liquid wastes. 43. Water formed at the end of sedimentation process A) Clarified water. B) Sugar solution. C) Treated waterp. D) Distilled water. Show Answer Correct Answer: A) Clarified water. 44. Sewage consists of ..... A) Physical matter. B) Chemical matter. C) Biological matter. D) All of the above. Show Answer Correct Answer: D) All of the above. 45. Sewage treatment A) Is a process of waste water treatment. B) Refers to waste water that is released by homes, industries, hospitals etc. C) Refers to the rain water that run down the streets during heavy rains. D) All of the above. Show Answer Correct Answer: A) Is a process of waste water treatment. 46. Disadvantages of Sewage System A) The domestic sewage treatment plant needs to be runningrarely to be effective. B) It must be permanently supplied with electricity tooperate. C) Waste Will Be Discharged. D) None of the above. Show Answer Correct Answer: B) It must be permanently supplied with electricity tooperate. 47. Best Way To Filter Water A) Chlorination. B) Boiling. C) Distillation. D) None of the above. Show Answer Correct Answer: B) Boiling. 48. Clean water is used for A) Drinking. B) Cooking. C) Both. D) None of the above. Show Answer Correct Answer: C) Both. 49. Oil and grease form the A) Sludge. B) Activated sludge. C) Scum. D) None. Show Answer Correct Answer: C) Scum. 50. Which plant have fleshy stem and produce new plants when their parts fall on the ground? A) Ginger. B) Cacti. C) Banana. D) Boungainvillea. Show Answer Correct Answer: B) Cacti. 51. THE BIOGAS CAN BE USED AS /TO PRODUCE A) FUEL. B) OXYGEN. C) ELECTRICITY. D) BOTH 1 AND 3. Show Answer Correct Answer: D) BOTH 1 AND 3. 52. Where does the water from the wastewater treatment plant go? A) Back to homes to be reused. B) Soaks back into the ground. C) Dumped into the River Raisin. D) To the drinking water facility. Show Answer Correct Answer: C) Dumped into the River Raisin. 53. How many meters does the manholes provided at every in the sewage A) 30 to 90. B) 40 to 80. C) 50 to 60. D) 50 to 70. Show Answer Correct Answer: C) 50 to 60. 54. We should not throw paints and greasy substances down the drain because A) They break the pipe. B) They harden and clog the pipe. C) They flow through the drain freely. D) None of these. Show Answer Correct Answer: B) They harden and clog the pipe. 55. Bacteria are beneficial to wastewater treatment because A) They naturally break down organic matter. B) They help solid material to settle out of the wastewater. C) The nutrients produced are beneficial to the treated water. D) They aren't beneficial. Show Answer Correct Answer: A) They naturally break down organic matter. 56. What is the process that takes place in the individual septic tank sewage treatment system? A) Anaerobic digestion. B) Osmosistic digestion. C) Homeostasis digestion. D) None of the above. Show Answer Correct Answer: A) Anaerobic digestion. 57. Sewage treatment process involve A) Removal of solid material. B) Sedimentation. C) Aeration of clarified water. D) All of these. Show Answer Correct Answer: D) All of these. 58. Aeration tank kills bacteria. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 59. Which gas is released during treatment of sludge? A) Carbon dioxide. B) No gas is released. C) Ozone. D) Biogas. Show Answer Correct Answer: D) Biogas. 60. What is the role of bacteria in the water purification process? A) Add nutrients to the sludge. B) Add chlorine. C) Digested organic matter. D) Nothing, we don't want them in there. Show Answer Correct Answer: C) Digested organic matter. ← PreviousNext →Related QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 13 Wastewater Story Quiz 1Class 7 Science Chapter 13 Wastewater Story Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books