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Waste water Story Test - 4

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Waste water Story Test - 4
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  • Question 1
    1 / -0
    When the water is cleaned where is it returned to?
    Solution
    Wastewater after cleaning is returned to the sea. Moreover, Our tap water, water in river and reservior are the sources of clean and safe water storage. Option B is correct.
  • Question 2
    1 / -0
    Which of the following activities require the usage of clean water?
    Solution
    • A large number of water born diseases can occur due to lack of drinking clean water.
    • Other activities such as watering garden plants and washing clothes require water but not necessarily clean water.
    • Thus, Option A is correct. 
  • Question 3
    1 / -0
    What are solid wastes commonly called?
    Solution
    The solid wastes are called as Garbage. Option B is correct.
  • Question 4
    1 / -0
    Which among the following are ways to conserve water?
    Solution
    Some of the ways to conserve or save water are-
    1. Turn off the taps while brushing teeth.
    2. Use less/limited water while bathing.
    3. Boil limited cups of water for drinking.
    4. Avoid food wastes as vegetables and cereals we eat require water to grow.
    5. Catch rainwaters in monsoon seasons
    Therefore Option D is correct.
  • Question 5
    1 / -0
    Which of the following is the correct example for the use of clean water?
    Solution
    The common uses of clean water include the following activities-
    • Drinking of clean and safe water
    • Cooking food requires clean water.
    • Agricultural activities such as Irrigation.
    Option D is correct.
  • Question 6
    1 / -0
    City garbage can be used to produce
    Solution
    • City garbage can be decomposed to form biogas and manure as it contains raw materials that can be degraded by the action of microorganisms. 
    • The microorganisms or decomposers convert the organic substances into simpler inorganic substances and in this process of decomposition biogas is formed.
    •  Biogas can be used for cooking purpose and is a great alternative for fossil fuels because biogas doesn't cause pollution. 
    • The nutrient-rich manure is used in agriculture to enhance the growth of crops and plants.
    So, the correct answer is 'biogas and manure'.
  • Question 7
    1 / -0
    Which among the following is/are farmers friend?
    Solution
    Earthworm helps in composting, thus gaining the name as Farmers friend. Option B is correct.
  • Question 8
    1 / -0
    The direct discharge of pollutants into water bodies leads to
    Solution
    Water pollution is the mixing of contaminants to the water bodies (e.g., lakes, rivers, oceans, aquifers and groundwater) which changes the desired quality of water. Water pollution affects the entire biosphere, plants and organisms living in these bodies of water.
  • Question 9
    1 / -0
    Chlorine tablet is used to remove .......... from waste water.
    Solution
    • Disinfectants are chemical agents applied to non-living objects in order to destroy bacteria, viruses, fungi, or mold living on the objects i.e. to sterilize them. For example - chlorine tablets.
    • They are made of calcium hypochlorite. These tablets dissolve in the wastewater, releasing the hypochlorite, which then becomes hypochlorous acid, the primary disinfectant.
    • Chlorine tablets are used to remove odour, dark colour, and many types of bacteria and viruses from wastewater.

    Hence, Option "D" is correct.
  • Question 10
    1 / -0
    In which of the following process, human excreta is completely converted to vermi cakes?
    Solution
    • Vermi-processing toilets is a design of a toilet in which humans excreta is treated by earthworms.
    • In this process, human excreta is completely converted to cake like structures called vermi cakes by earthworms. 
    • Vermi cakes are used mostly in the soil as manure and fertilizers

    So, the correct answer is 'Vermi-processing toilets'.
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