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Environmental Issues Test - 4

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Environmental Issues Test - 4
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  • Question 1
    1 / -0

    In Delhi whole public transport system runs on CNG because :
    i. burns more efficiently than petrol/diesel
    ii. is cheaper than petrol/diesel
    iii. cannot be siphoned
    iv. can be adulterated

    Solution

    In Delhi, pollution level is very high. To curb this, the whole public transport system runs on CNG. CNG burns more efficiently than petrol and diesel. It is cheaper than petrol and diesel. CNG can be adulterated and cannot be siphoned.

  • Question 2
    1 / -0

    CO2 concentration is continuously increasing in atmosphere and due to increased CO2 levels:
    i. efficiency of water use by plants will increase
    ii. COfertilization effect will occur
    iii. rate of transpiration will decrease

    Solution

    CO2concentration is continuously increasing in atmosphere and due to increased CO2 to levels. At higher concentration of carbon dioxide the efficiency of water use by plants will increase. Rate of transpiration will also decrease along with CO2 fertilization effect.

  • Question 3
    1 / -0

    The dust collection efficiency of Electrostatic precipitator is affected by the particle size of the aerosol to be collected, so :

    Solution

    Electrostatic precipitator is used to remove particulate matters from chimneys of factories. imageElectrostatic precipitators (ESPs) or electrostatic air cleaners are particulate collection devices which use electrostatic forces to separate particulate matter (PM) from exhaust gases. Electrostatic precipitators (ESP) are highly-efficient and can remove dust and smoke from the airstream by minimally interfering with the flow of gases through the device. The collection efficiency of electrostatic precipitators is largely dependent on the particle size of the aerosol to be collected.

  • Question 4
    1 / -0

    Particulate matter:
    i. smaller than 2 micrometer are trapped in nasal hair and bronchial mucus.
    ii. which reach the lung alveoli are not absorbed into the blood.

    Solution

    Particulate size 2.5 micrometer or less in diameter are responsible for causing greatest harm for human health. So, particulate matter smaller than 2 micrometer are not trapped in nasal hair and bronchial mucus and reaches to lungs.

  • Question 5
    1 / -0

    Read the following statements:
    i. PAN & Ozone are secondary pollutants formed by reaction among primary pollutants.
    ii. conversion of primary pollutants into secondary pollutants reduces toxicity due to the phenomenon of synergism.

    Solution

    Peroxyacytyle nitrate (PAN) is a component of photochemical smog and Ozone are secondary pollutants formed by reaction among primary pollutants. Conversion of primary pollutant into secondary pollutants increases their toxicity.

  • Question 6
    1 / -0

    For blue baby syndrome :

    i. nitrate becomes a problem for human body when converted into nitrite.

    ii. changes Fe+3 of Hb into Fe+2 of MHb. iii. Clinical symptoms include cyanosis.

    iv. People of any age can suffer from blue baby disease.

    Solution

    Blue baby syndrome can be caused by nitrate contamination in ground water resulting in decreased oxygen carrying capacity of hemoglobin in babies leading to death. The clinical symptoms include cyanosis. This disease may occur at any age.

  • Question 7
    1 / -0

    There are two types of catalytic converters :

    a) 2-way catalytic converter treats only NOx and CO.

    b) 2-way catalytic converter treats hydrocarbons, NOx and CO

    Solution

    Catalytic converters are used for complete combustion of unburn parts of hydrocarbons. 2-way catalytic converter treats only nitrogen oxides and carbon monoxide gases released from exhaust of vehicles.

  • Question 8
    1 / -0

    Planting trees on both the sides of roads and highways is called providing green muffler. It is to reduce :

    Solution

    Muff means something which can obstruct sound. Green mufflers are barriers grown near noisy places to reduce the impact of noise. Normally 4 to 5 rows of green plants are grown near the noisy places like highways or industrial areas so that they obstruct the sound reaching citizens. The trees even block sharp lights of the vehicles at the time of night.

    Planting trees on both the side of roads and highways is called providing green muffler. It is done to reduce noise pollution to nearby residential areas.

  • Question 9
    1 / -0

    irreparable computers and other electronic goods are known as

    Solution

    E-waste is a popular, informal name for electronic products nearing the end of their "useful life." Computers, televisions, VCRs, stereos, copiers, and fax machines are common electronic products. Many of these products can be reused, refurbished, or recycled. Electronic waste (E-wastes) are buried in landfills or incinerated.

  • Question 10
    1 / -0

    Various methods applied for removing particulate pollutants from air employs:

    Solution

    For removing particulate pollutants from air various methods are applied such as use of activated charcoal and calcium hydroxide that absorbs the particulate matters form polluted air.

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