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