A. Hydrochloric acid
B. Sulphuric acid
C. Nitric acid
D. Citric acid
A. House sewer
B. Out-fall sewer
C. Branch sewer
D. Main sewer
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
A. Carbondioxide
B. Hydrogen sulphide
C. Methane
D. All of these
A. 100 to 500
B. 500 to 1000
C. 1000 to 1500
D. 1500 to 2000
A. D²
B. D²
C. D²
D. D²
A. Flushing
B. Cane rodding
C. Wooden pills
D. None of these
A. Hydrogen sulphide (H2S)
B. Carbon dioxide (CO2)
C. Methane (CH4)
D. All the above
A. 1/3
B. 0/2
C. 0/3
D. 2 /3
A. More than the rate of water supply
B. Equal to the rate of water supply
C. Less than the rate of water supply
D. At 150 litres per capita