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  1. Bleaching powder is used in drinking water as a/an

  2. A.

     Disinfectant

    B.

     Antibiotic

    C.

     Antiseptic

    D.

     Coagulant

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  3. The process of removing calcium and magnesium from hard water is known as

  4. A.

     Sedimentation

    B.

     Filtration

    C.

     Flocculation

    D.

     Water softening

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  5. Hard water and soft water can be distinguished by using

  6. A.

     Dilute acid

    B.

     Ordinary soap

    C.

     Detergent

    D.

     Liquid soap

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  7. Which method will be employed to test the hardness of water?

  8. A.

     Boiling

    B.

     Distillation

    C.

     Formation of lather with soap

    D.

     None of these

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  9. The purest form of water is

  10. A.

     Tap water

    B.

     Rain water

    C.

     Ground water

    D.

     Distilled water

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  11. Water cycle refers to

  12. A.

     An integrated attempt to recycle water in relatively arid regions

    B.

     Constant movement of water from ocean to land and back to ocean once again

    C.

     Scientific management of water in areas excessively plagued with water-logging

    D.

     Water distribution in relatively dry areas

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  13. Permanent hardness of water may be removed by addition of

  14. A.

     Alum

    B.

     Sodium carbonate

    C.

     Lime

    D.

     Potassium Permangante

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  15. Acid rain is caused due to pollution of atmosphere by

  16. A.

     Oxides of carbon and nitrogen

    B.

     Oxides of nitrogen and sulphur

    C.

     Oxides of nitrogen and phosphorous

    D.

     None of these

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  17. What are the components responsible for acid rain?

  18. A.

     Nitrogen monoxide (NO) and Carbon monoxide (CO)

    B.

     Sulphur dioxide (SO2) and Nitrogen oxides (NOx)

    C.

     Carbon dioxide (CO2) and Carbon monoxide (CO)

    D.

     Oxides of carbon (COx) and Oxides of nitrogen (NOx)

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  19. Which gas emitted by power stations causes acid rain?

  20. A.

     Carbon dioxide

    B.

     Sulphur dioxide

    C.

     Helium

    D.

     Nitrogen

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