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Chemical Engineering :: Environmental Engineering

  1. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

  2. A.
    60
    B.
    90
    C.
    105
    D.
    120

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  3. The most commonly used chemical coagulant in water treatment is

  4. A.
    ferrous sulphate
    B.
    alum
    C.
    lime
    D.
    hydrazine

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  5. The biological decomposition of organic substances in wastes controlled conditions is called

  6. A.
    incineration
    B.
    biological oxidation
    C.
    composting
    D.
    none of these

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  7. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of

  8. A.
    CO2
    B.
    SO2
    C.
    hydrocarbons
    D.
    CFC (chloro fluoro carbon)

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  9. Smog is not formed due to the presence of __________ in the atmosphere.

  10. A.
    SO2
    B.
    NOx
    C.
    CO2
    D.
    any of these

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  11. Pick out the correct statement.

  12. A.
    Deforestation helps in controlling the green house effect.
    B.
    Global warming is detrimental for increase in food productivity and may cause flood and cyclone.
    C.
    Lightening discharges are natural source of production of SO2 & H2S pollutant.
    D.
    Sulhur dioxide causes death by asphyxiation.

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  13. Which of the following is not a source of ozone emission in the atmosphere ?

  14. A.
    Refrigerators.
    B.
    Xerox machines.
    C.
    Dermatological photo-therapy equipments.
    D.
    High voltage electrical equipments.

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  15. Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the

  16. A.
    forestation
    B.
    rain
    C.
    green house effect
    D.
    vegetation

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  17. Pick out the correct statement.

  18. A.
    Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water.
    B.
    COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time.
    C.
    COD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre.
    D.
    all (a), (b) and (c).

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  19. The upper layer of atmosphere is called the

  20. A.
    stratosphere
    B.
    troposphere
    C.
    ionosphere
    D.
    none of these

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