Home / Chemical Engineering / Environmental Engineering :: Section 4

Chemical Engineering :: Environmental Engineering

  1. Pick out the wrong statement pertaining to 'green house' for the plants.

  2. A.
    'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants inside it.
    B.
    The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house.
    C.
    'Green house effect' in earth's atmosphere is due to increasing CO2 level in atmosphere. where CO2 acts like the glass of 'green house' thereby warming up the earth's surface.
    D.
    'Green house' is colder than the outside atmosphere.

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. In water treatment, alum[Al2(SO4)3] is used for the process of

  4. A.
    filtration
    B.
    coagulation
    C.
    sedimentation
    D.
    disinfection

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. Pick out the one which is not a chemical coagulant.

  6. A.
    Aluminium sulphate
    B.
    Ferrous sulphate
    C.
    Hydrated lime
    D.
    Chloramine

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Presence of iron and manganese in water causes

  8. A.
    reduction in its dissolved oxygen content.
    B.
    discoloration of bathroom fixtures.
    C.
    temporary hardness.
    D.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. Septic tanks are used for the __________ of the deposited solids.

  10. A.
    separation
    B.
    anaerobic decomposition
    C.
    aerobic decomposition
    D.
    none of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.

  12. A.
    20
    B.
    100
    C.
    400
    D.
    200

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Which of the following acts as a natural source of air pollution ?

  14. A.
    Forest fire
    B.
    Deforestation
    C.
    Volcanic eruption
    D.
    None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. Higher concentration of CO2 in atmosphere

  16. A.
    allows visible solar radiation (ultraviolet) of short wave-length to pass through.
    B.
    reflects and absorbs the longer wavelength (infra-red) radiations.
    C.
    prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming.
    D.
    all (a), (b) and (c).

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

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

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Radioactive substances present in the polluted water stream can be removed by

  20. A.
    biological oxygen treatment.
    B.
    coagulation and filtration.
    C.
    adsorption in ion exchange materials.
    D.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum