The maximum permissible limit for flouride in drinking water is______________?

Related Mcqs:

1. On standard silica scale, the turbidity in drinking water should be limited to_______________?

   A. 10 ppm B. 20 ppm C. 30 ppm D. 50 ppm...

2. Alum as a coagulant is found to be most effective when pH range of water is______________?

   A. 2 to 4 B. 4 to 6 C. 6 to 8 D. 8 to 10...

3. Average rate of water consumption perhead per day as per Indian Standard is______________?

   A. 100 litres B. 135 litres C. 165 litres D. 200 litres...

4. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?

   A. 1 ppm B. 4 ppm C. 10 ppm D. 40 ppm...

5. Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below?

   A. Both A and R are true and R is the correct explanation of A B. Both A and R are true but R is not the correct explanation of A C. A is true but R is false D. A is false but R is true...

6. The suitable layout of distribution system for a city with roads of rectangular pattern is______________?

   A. grid iron system B. dead end system C. ring system D. radial system...

7. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?

   A. 1 B. 100 C. infinite D. zero...

8. Dissolved oxygen in streams is______________?

   A. maximum at noon B. minimum at noon C. maximum at midnight D. same throughout the day...

9. The maximum efficiency of BOD removal is achieved in______________?

   A. oxidation pond B. oxidation ditch C. aerated lagoons D. trickling filters...

10. The maximum discharge of a tube-well is about_________________?

    A. 5 litres/sec B. 50 litres/sec C. 500 litres/sec D. 1000 litres/see...