The phenolic compounds in public water supply should not be more than_______________?
A. 0.1 ppm
B. 0.01 ppm
C. 0.001 ppm
D. 0.0001 ppm
Environmental Engineering
The maximum discharge of a tube-well is about_________________?
B. 50 litres/sec(Correct)
C. 500 litres/sec
D. 1000 litres/see
Ground water is usually free from________________?
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_______________?
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?
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_______________?
B. 20 ppm
C. 30 ppm
D. 50 ppm
Orthotolidine test is used for determination of________________?
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______________?
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__________________?
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_________________?
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 decreased
D. none of the above