Water Supply Engineering - Water Supply Engineering objective questions and answers

6.  Dissolved impurities consist of

   A. Bacteria

   B. Iron

   C. Salt

   D. Fungi

7.  Sphere shaped Bacterias are called

   A. Spirilla

   B. Bacilli

   C. Cocci

   D. Trichobacteria

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

   A. 5 minutes

   B. 20 minutes

   C. 1 hour

   D. 2 hours

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

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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