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