BOD of raw municipal sewage may be in the range of about _____________ mg/litre?

A. Asphyxiation (suffocation)
B. Shortness of breath
C. Tuberculosis
D. All A., B. and C.

A. Grit
B. Aggregates
C. Aerosols
D. Smoke

A. HF
B. SO2
C. H2S
D. Both B. & C.

A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
B. Appears only on sunny days
C. Is harmful for crops and trees also besides causing eye irritation & asthma
D. All A., B. & C.

A. Carbon dioxide
B. Toluene
C. Carbon disulphide
D. Acetaldehyde

A. 0.01
B. 0.1
C. 1
D. 4