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Waste water Story Test - 8

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Waste water Story Test - 8
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The waste from toilets can be used for making _______________.
    Solution
    Toilets can be used for making vermicompost using earthworms. In this, vermiculture bins are added to the toilet system and dry toilet is composted using earthworms. Toilets and urine contains substances like phosphorous, potassium and nitrogen. These are major components of chemical fertilizers.  Recycling and reuse of toilets for making biogas is a common practice. It is done by anaerobic decomposition of toilets. All these reduces the hazardous substances. 
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Dried sludge is used as:
    Solution
    Activated sludge is formed as the suspended microbes settle at the bottom of the aerator tank. This activated sludge is 97% water and it is dried using sand drying beds or machines to obtain dried sludge. Dried sludge is used as manure, returning organic matter and nutrients to the soil.
    Hence, the correct answer is 'A'.
  • Question 3
    1 / -0
    Most of organic matter present in sewage is
    Solution
    Most of the organic matter like oil, urea, pesticides, herbicides, fruit and vegetable waste, etc present in sewage are biodegradable i.e. capable of being decomposed by bacteria or other living organisms and thereby avoiding pollution.

    Option "C" is correct.
  • Question 4
    1 / -0
    When harmful substances get mixed with water it becomes:
    Solution
    When harmful substances like pesticides, toxic substances, get mixed with water it becomes contaminated or polluted.
    Polluted water is not safe for use.
    So, the correct option is A.
  • Question 5
    1 / -0
    The Commercial wastes mainly consist of:
    Solution
    The commercial wastes mainly consists of packaging materials like cardboard, paper and plastic. And does not include Food wastes and organic impurities.

    Option "C" is correct.
  • Question 6
    1 / -0
    Treated Wastewater usually disposed in
    Solution
    • Treatment of wastewater involves physical, chemical, and biological processes, which remove physical, chemical and biological matter that contaminates the wastewater. This treatment is done in Wastewater treatment Plant (WWTP).
    • The treated wastewater from the WWTP has a very low level of organic material and suspended matter. It is discharged into a sea or a river.
    • Thus, Treated waste water usually disposed in to water bodies.
    Option "A" is correct.
  • Question 7
    1 / -0
    Rainwater can be preserved by building small reservoirs, contour building and
    Solution
    Rainwater can be preserved by building small reservoirs, contour building and dams.
    Option "C" is correct.
  • Question 8
    1 / -0
    Study the following statements about ozone:
    (a) It is essential for the breathing of living organisms.
    (b) It is used to disinfect water.
    (c) It absorbs ultraviolet rays.
    (d) Its proportion of air is about 3%. Which of these statements are correct?
    Solution
    • Ozone, or trioxygen, is an inorganic molecule with the chemical formula $$O_3$$. It is a pale blue gas with a distinctively pungent smell.
    • Oxygen is essential for the breathing of living organisms. Hence statement (a) is incorrect.
    • Ozone is a powerful oxidant, stronger than chlorine. Ozone is used to disinfect, deodorize, decolourize and decompose organic substances in water. Hence Statement (b) is correct.
    • The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. Hence statement (c) is correct.
    • The proportion of ozone in the air is 0.000004%. Hence Statement (d) Is incorrect.
    • So, the correct answer is '(b) and (c)'.
  • Question 9
    1 / -0
    Sewage is mainly a 
    Solution
    The waste water that flows down drains and through pipes from toilets and sinks is called sewage. It is majorly liquid. The small amount of solid waste that is present in the sewage do eventually get dissolved in it.
    Thus, the correct answer is (A).
  • Question 10
    1 / -0
    Which of the following is not a source of wastewater?  
    Solution
    The pipes through which the wastewater flows into the sewage are known as sewers, whereas, wastewater is collected into the sewage from homes, industries and hospitals. Hence, sewers is not a source of wastewater.
    So, the correct option is 'A'. 
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