Ncert- science – class 7- Chapter 13 – Wastewater Story 1 Welcome to your Ncert- science – class 7- Chapter 13 – Wastewater Story 1 1. Which of the following is a part of inorganic impurities of the sewage? Phosphates Urea Pesticides Vegetable waste None 2. Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease? Typhoid Asthma Dysentry Cholera None 3. Which of the following is/are products of wastewater treatment? Both biogas and sludge Aerator Biogas Sludge None 4. Biodegradable waste Enters the food chains then causes bio magnification Accumulates in environment Does not decompose Decomposes in nature by microbes None 5. Bacteria that decompose organic wastes are called All of these Aerobic bacteria Anaerobic bacteria Lactobacillus bacteria None 6. Polythene and plastics Do not generate any bad odour Are non-biodegradable and very harmful Degrade in the environment very easily Are not harmful None 7. Filtration plants uses _____ filters to remo steel sand paper none of these None 8. Which of the following is biodegradable? Aluminium foil Aluminium Plastic bottle Orange peels None 9. Bacteria that decompose organic wastes are called Anaerobic bacteria All of these Aerobic bacteria Lactobacillus bacteria None 10. Pick from the following one chemical used to disinfect water Chlorine Coal Silica Washing soda None 11. Which of the following is not an example of municipal solid waste? Sewage Paper Packing materials Batteries None 12. The direct discharge of pollutants into water bodies leads to All of the above Soil pollution Air pollution Water pollution None 13. An example of source reduction of waste is Throwing things that are old Burning Making paper aero planes Backyard composting None 14. Which among the following are ways to conserve water? Boil limited cups of water for drinking. All of the above Use less/limited water while bathing. Turn off the taps while brushing teeth. None 15. Open drain system is a breeding place for which of the following? All of these Flies Mosquitoes Organisms which cause diseases None 16. Addition of harmful substance in water leads to Microbial growth Algal bloom Water pollution High oxygen demand None 17. The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as sewers sewerage treatment plant. transport system. None 18. Which of the following is removed when wastewater is passed through bar screens? Grit Cans Sand Pebbels None 19. Which of the following is wastewater? Water coming out of a shower. Water trickling from a damaged tap. Water flowing in a river. Water coming out of a laundry. None 20. In a filtration plant water is filtered using layers of sand and fine gravel. sand and clay. clay and fine gravel. sand, fine gravel and medium gravel. None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
