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Pollution of Air and Water Test - 34

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Pollution of Air and Water Test - 34
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  • Question 1
    1 / -0
    __________ used as refrigerants and aerosol propellants are also greenhouse gases.
    Solution
    Chlorofluorocarbons (CFCs), once used as refrigerants and aerosol propellants until they were phased out by international agreement, are also greenhouse gases. They damage the ozone layer of the atmosphere. 
  • Question 2
    1 / -0
    Global warming leads to:
    Solution
    Global warming is the term used to describe a gradual increase in the average temperature of the earth's atmosphere and its oceans. It is a change that is believed to be permanently changing the earth's climate.
  • Question 3
    1 / -0
    Greenhouse effect is a major cause of:
    Solution
    A greenhouse gas is any gaseous compound in the atmosphere that is capable of absorbing infrared radiation, thereby trapping and holding heat in the atmosphere. By increasing the heat in the atmosphere, greenhouse gases are responsible for the greenhouse effect, which ultimately leads to global warming.
  • Question 4
    1 / -0
    Which of the following is a cause of Ganga river pollution?
    Solution
    Ganga river is one of the ten most endangered rivers in the world. In many places, because of high pollution, aquatic life cannot survive in it. The increased pollution is due to increased population and industrialization near the banks of Ganga. These have led to a steep rise in the release of wastes into the river, thus contaminating it.
    So, the correct answer is option A.
  • Question 5
    1 / -0
    Water pollution can be caused due to:
    Solution
    When harmful substances such as sewage, toxic chemicals, silt, etc., get mixed with water, it causes water pollution. The substances that pollute water are called water pollutants.
    Option $$D$$ is correct.
  • Question 6
    1 / -0
    Which of the following is a factor that affect the degree to which any greenhouse gas will influence global warming?
    Solution
    • By increasing the heat in the atmosphere, greenhouse gases are responsible for the greenhouse effect, which ultimately leads to global warming. Three factors affect the degree to which any greenhouse gas will influence global warming: its abundance in the atmosphere, how long it stays in the atmosphere and Its global-warming potential.
  • Question 7
    1 / -0
    Which of the following is the most common household method for water purification?
    Solution
    One of the easiest ways to treat water is by boiling it. Boiling water may not remove heavy contaminants, but it can definitely neutralise most bacteria and viruses present in it.
  • Question 8
    1 / -0
    _____ can be added to water to kill certain bacteria.
    Solution
    Water chlorination is the process of adding chlorine or hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is highly toxic. In particular, chlorination is used to prevent the spread of waterborne diseases such as cholera, dysentery, typhoid etc.
  • Question 9
    1 / -0
    What are the properties of potable water?
    Solution
    The $$1^{st}$$ step for healthy water is to ensure the water is clean which involves removing the toxic and harmful contaminants that are present in the water. Water should be free from fluoride, metals like lead, bacteria. Water naturally has beneficial minerals including calcium, magnesium, sodium & potassium. The key to creating healthy water is by removing the contaminants while retaining the beneficial minerals. Higher amounts of minerals in drinking water lowers heart disease and cancer mortality rates. A healthy alkaline $$pH$$ level for drinking water is between $$7$$ and $$8.5$$. Alkaline water helps to neutralize stored acids and helps eliminate toxins.
    Hence, all the given options are correct. 
  • Question 10
    1 / -0
    The chemical released in the Ganga river is:
    Solution
    The industries around the Ganga river include oil refineries, paper factories, sugar mills, etc. These industries release chemicals like arsenic, lead, and fluorides which lead to the toxicity of aquatic plants and animals.
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