A. 1
B. 5
C. 10
D. 50
A. Calcium
B. Fluorine
C. Phosphorous
D. Sulphur
A. Chemical coagulation
B. Floatation & skimming
C. Centrifugation
D. Ultra filtration
A. 10
B. 20
C. 40
D. 80
A. Flood
B. Cyclone
C. Decrease in food productivity
D. All A., B. and C.
A. Ozone and iodine
B. Chlorine or its compounds
C. Ultraviolet light for irradiation of water
D. All A., B. & C.
A. Dilution with inert material
B. Discharging to atmosphere through tall stacks after dilution
C. Disposing off in rivers & oceans
D. Filling in steel crates and shooting it off out of earth’s gravity
A. Catalytic conversion
B. Green house effect
C. Global warming
D. Both B. and C.
A. Active carbon
B. Silica gel
C. Bog iron (iron oxide)
D. Pulverised limestone
A. CO2
B. H2
C. SO3
D. N2