The phenolic compounds in public water supply should not be more than_______________?
The phenolic compounds in public water supply should not be more than_______________? A. 0.1 ppm B. 0.01 ppmC. 0.001 ppm D. 0.0001 ppm
The phenolic compounds in public water supply should not be more than_______________? A. 0.1 ppm B. 0.01 ppmC. 0.001 ppm D. 0.0001 ppm
The maximum discharge of a tube-well is about_________________? A. 5 litres/sec B. 50 litres/sec(Correct) C. 500 litres/sec D. 1000 litres/see
Ground water is usually free from________________? A. suspended impurities B. dissolved impurities C. both suspended and dissolved impuri¬ties D. none of the above
Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________? A. hardness in water(Correct) B. turbidity in water C. dissolved oxygen in water D. residual chlorine in water
Which of the following values of pH represents a stronger acid? A. 2 B. 5 C. 7 D. 10
On standard silica scale, the turbidity in drinking water should be limited to_______________? A. 10 ppm(Correct) B. 20 ppm C. 30 ppm D. 50 ppm
Orthotolidine test is used for determination of________________? A. dissolved oxygen B. residual chlorine(Correct) C. biochemical oxygen demand D. dose of coagulant
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________? A. 0.01 to 0.05 ppm B. 0.05 to 0.5 ppm(Correct) C. 0.5 to 1.0 ppm D. 1.0 to 5.0 ppm
The velocity of flow of water in a sedimentation tank is about__________________? A. 5 to 10 cm/sec. B. 15 to 30 cm/sec.C. 15 to 30 cm/minute D. 15 to 30 cm/hour
The settling velocity of a particle in a sedimentation tank increases if_________________? A. particle size is decreased B. the surface area of tank is increased C. the depth of tank is decreasedD. none of the above