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