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Chemical Engineering :: Environmental Engineering

Environmental Engineering - Section 1
Environmental Engineering - Section 2
Environmental Engineering - Section 3
Environmental Engineering - Section 4
Environmental Engineering - Section 5
Environmental Engineering - Section 6
Environmental Engineering - Section 7

  1. Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

    2. A.
    biological oxidation.
    B.
    skimming off.
    C.
    settling out using chemical reagents.
    D.
    chlorination.

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  2. The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

    3. A.
    decreases.
    B.
    increases.
    C.
    remains constant.
    D.
    may increase or decrease ; depends on the chemical characteristics of polluted water.

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  3. Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

    4. A.
    grit
    B.
    dust
    C.
    powder
    D.
    smoke

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  4. Which of the following is the most severe air pollutant ?

    5. A.
    hydrocarbons
    B.
    NOx
    C.
    SO2
    D.
    CO

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  5. Presence of bacteria in potable (drinking) water causes

    6. A.
    turbidity
    B.
    disease
    C.
    bad odour
    D.
    bad taste & colour

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  6. What are the methods of treatment & disposal of radioactive wastes ?

    7. A.
    Evaporation & chemical precipitation.
    B.
    Biological methods & adsorption in ion exchange materials.
    C.
    Fixing into a solid mass with cement and sinking deep in the sea.
    D.
    All (a), (b) & (c).

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  7. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

    8. A.
    coagulation and flocculation of colloids.
    B.
    oxidation of carbonaceous matter to CO2.
    C.
    nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate.
    D.
    all (a), (b) and (c).

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  8. Main pollutant present in automobile exhaust is

    9. A.
    CO
    B.
    CO2
    C.
    NO
    D.
    hydrocarbons

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  9. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.

    10. A.
    20
    B.
    60
    C.
    90
    D.
    120

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  10. Industrial workers working in leather tanning & manufacturing units are prone to suffer from

    11. A.
    respirtory ailments (e.g. bronchitis).
    B.
    skin diseases (e.g. dermatities).
    C.
    silicosis.
    D.
    blurred vision.

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