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Chemical Engineering :: Environmental Engineering

  1. Foul odour and bad taste of water is removed by treating with

  2. A.
    alum
    B.
    bleaching powder
    C.
    activated carbon
    D.
    copper sulphate.

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  3. Presence of __________ in water stream are deleterious to aquatic life.

  4. A.
    soluble and toxic organics.
    B.
    suspended solids.
    C.
    heavy metals and cynides.
    D.
    all (a), (b) & (c).

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  5. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).

  6. A.
    1
    B.
    3
    C.
    7
    D.
    20

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  7. Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.

  8. A.
    moderately
    B.
    highly
    C.
    extremely
    D.
    very extremely

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  9. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.

  10. A.
    75
    B.
    95
    C.
    120
    D.
    140

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  11. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

  12. A.
    explosion
    B.
    non biodegradable foam
    C.
    undesirable plant growth
    D.
    corrosion

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  13. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

  14. A.
    with greater number of blades.
    B.
    of increased diameter.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

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  15. Presence of soluble organics in polluted water causes

  16. A.
    undesirable plants growth.
    B.
    depletion of oxygen.
    C.
    fire hazards.
    D.
    explosion hazards.

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  17. Which of the following pollutants, if present in atmosphere is detectable by its odour ?

  18. A.
    CO
    B.
    SO2
    C.
    NO2
    D.
    CO2

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  19. Exposure to chemicals having carcinogenic properties cause

  20. A.
    dermatitis (skin disorder)
    B.
    cancer
    C.
    asphyxiation
    D.
    asthma

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