Water Supply Engineering - Water Supply Engineering objective questions and answers

21.  The total count of bacteria in portable water should not exceed

   A. 10000 per c.c.

   B. 5000 per c.c.

   C. 999 per c.c.

   D. 100 per c.c.

22.  Disinfection of water with ozone isn't good because

   A. It vanishes before water reaches the consumers

   B. It removes the colour taste and odour from water as bacterious

   C. It adds taste to the water

   D. It is more efficient than chlorine in killing bacterias

23.  Biochemical oxygen demand ( B.O.D. ) of safe drinking water must be

   A. 0

   B. 10

   C. 50

   D. 100

24.  The odour of water can be determined by

   A. Thermometer

   B. Osmoscope

   C. Jackson's turbidimeter

   D. None of the above

25.  The water obtained from tubewells is known ass

   A. Surface water

   B. Sub surface water

   C. Run-off

   D. Portable water

< 1 2 3 4 5 6 7 8 9 10 Next>