Water Supply Engineering - Water Supply Engineering objective questions and answers


6.  Dissolved impurities consist of


   A. Bacteria

   B. Iron

   C. Salt

   D. Fungi


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B. Iron

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7.  Sphere shaped Bacterias are called


   A. Spirilla

   B. Bacilli

   C. Cocci

   D. Trichobacteria


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C. Cocci

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8.  The time of contact for chlorination should be at least


   A. 5 minutes

   B. 20 minutes

   C. 1 hour

   D. 2 hours


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B. 20 minutes

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9.  The detention time for an ordinary plain sedimentation tank is


   A. 1 to 2 hours

   B. 2 to 4 hours

   C. 6 to 8 hours

   D. 20 to 24 hours


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C. 6 to 8 hours

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10.  The velocity of flow in any sedimentation tank should not exceed


   A. 0.05 mm/sec

   B. 0.5 mm/sec

   C. 5 mm/sec

   D. 50 mm/sec


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C. 5 mm/sec

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