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