Pathogens (or pathogenic bacterias) in water may cause___________________?

Related Mcqs:

1. Depletion of ozone layer in the outer atmosphere may cause___________________ ?

   A. Lung cancer
   B. Skin cancer
   C. Bronchitis
   D. Heart disorder

2. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?

   A. Bio-Chemical Oxygen Demand (B.O.D.)
   B. Dissolved Oxygen (D.O.)
   C. Chemical Oxygen Demand (C.O.D.)
   D. None of these

3. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?

   A. 0.05552 cumec
   B. 0.05554 cumec
   C. 0.05556 cumec
   D. 0.0556 cumec

4. As compared to fresh river water, sea water contains oxygen_________________?

   A. 10% less
   B. 20% less
   C. 10% more
   D. 20% more

5. weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?

   A. w r S S
   B. w r1/2
   C. w r S
   D. w r2/3

6. Specific weight of sea water is more that of pure water because it contains ________________?

   A. dissolved air
   B. dissolved salt
   C. suspended matter
   D. all of the above
   E. heavy water

7. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will__________________?

   A. increase
   B. decrease
   C. remain same
   D. increase/decrease depending on depth of immersion
   E. unpredictable

8. An open vessel of water is accelerated up an inclined plane. The free water surface will___________________?

   A. be horizontal
   B. make an angle in direction of inclination of inclined plane
   C. make an angle in opposite direction to inclination of inclined plane
   D. any one of above is possible
   E. none of the above

9. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to___________________?

   A. head of water (h)
   B. h2
   C. V/T
   D. h2
   E. h3/1.

10. The rainfall at any place may be determined by__________________?

    A. Its intensity
    B. Its direction
    C. Its frequency
    D. All the above