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Chemistry - section - 2
  1. The water pollution in river is measured by the dissolved amount of

    2. A.

     Chlorine
    B.

     Ozone
    C.

     Nitrogen
    D.

     Oxygen

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  2. Ultraviolet rays can be used in water treatment as

    3. A.

     Flocculator
    B.

     Precipitator
    C.

     Hydrolyser
    D.

     Disinfectant

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  3. Tar roads get damaged if there is

    4. A.

     Stagnation of water on road
    B.

     Heavy traffic
    C.

     No maintenance
    D.

     No sloping

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  4. Aerated water contains

    5. A.

     SO2
    B.

     NO2
    C.

     H2
    D.

     CO2

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  5. The BOD values of water indicate the

    6. A.

     Amount of organic debris
    B.

     Amount of oxygen used for biochemical oxidation
    C.

     Amount of oxygen used for biochemical reduction
    D.

     Amount of ozone used for biochemical oxidation

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  6. Iron and manganese present as pollutants in water cannot be removed by________

    7. A.

     Oxidation followed by settling and filtration
    B.

     Chlorination
    C.

     Ion exchange process
    D.

     Lime soda process or manganese zeolite process

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  7. Table salt gets moist during rainy season because

    8. A.

     Sodium chloride is hygroscopic
    B.

     Sodium chloride is deliquescent
    C.

     Sodium chloride contains some quantity of sodium iodide
    D.

     Sodium chloride contains hygroscopic impurities like magnesium chloride

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  8. The unit to measure the flow of water is

    9. A.

     Micro Mho
    B.

     Ohm meter
    C.

     Milli curie
    D.

     Cusecs

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  9. When water itself combines chemically with some element or mineral it is called

    10. A.

     Carbonation
    B.

     Desilication
    C.

     Hydration
    D.

     Oxidation

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  10. Sea water is saltier than rain water because

    11. A.

     Sea animals are salt producing
    B.

     The air around the sea is saltish
    C.

     Rivers wash away salts from earth and pour them into the sea
    D.

     Sea beds have salt producing mines

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