A rainfall may be classified as acidic if its pH value is less or equal to________________?
A rainfall may be classified as acidic if its pH value is less or equal to________________?
A. 6
B. 7
C. 5
D. 6.5
Similar Posts
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?A. 100 mg/l
B. 200 mg/l
C. 300 mg/l
D. 400 mg/lThe capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?A. 1 mm
B. 5 mm
C. 10 mm
D. 20 mm
E. 30 mmDesign period of 40 to 50 years is adopted for_________________?
Design period of 40 to 50 years is adopted for_________________?A. Branch sewers
B. Main sewers
C. Trunk sewers
D. All the aboveThe rational formula for peak drainage discharge, was evolved by_________________?
The rational formula for peak drainage discharge, was evolved by_________________?A. Fruhling
B. Lloyd David
C. Kuichling
D. All of theseIf the surface of liquid is convex, men_________________?
If the surface of liquid is convex, men_________________?A. cohesion pressure is negligible
B. cohesion pressure is decreased
C. cohesion pressure is increased
D. there is no cohesion pressure
E. none of the aboveIf is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?A. 1.250 D
B. 1.350 D
C. 1.425 D
D. 1.625 D