A. Nitrates
B. Nitrites
C. Free ammonia
D. None of these
A. upthrust
B. buoyancy
C. center of pressure
D. all the above are correct
E. none of above is correct
A. Cast iron sewers
B. Cement concrete sewers
C. Glazed bricks sewers
D. Stone ware sewers
A. 30 to 40%
B. 40 to 60%
C. 60 to 80%
D. 80 to 90%
A. adhesion
B. cohesion
C. surface tension
D. viscosity
E. compressibility
A. 50 m
B. 100 m
C. 200 m
D. 300 m
A. Unexpected large scale infiltration of stream water
B. Unexpected increase in the population
C. Under estimates of maximum and average flows
D. All of the above