Salt content in sea water is about ______________ percent?
Salt content in sea water is about ______________ percent?
A. 0.5
B. 1
C. 3.5
D. 9.05
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Presence of bacteria in potable (drinking) water causes_________________?
Presence of bacteria in potable (drinking) water causes_________________?A. Turbidity
B. Disease
C. Bad odour
D. Bad taste & colourThe Killer gas which caused Bhopal gas tragedy in 1984 was________________?
The Killer gas which caused Bhopal gas tragedy in 1984 was________________?A. Phosgene
B. Methyl isocyanate (MIC)
C. Carbon monoxide
D. Sulphur dioxide______________ cannot control the noise pollution ?
______________ cannot control the noise pollution ?A. Use of silencers
B. Green house gases
C. Vibration damg
D. Tree plantationMaximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?A. 50
B. 1000
C. 2000
D. 5000Pick out the one which is not a chemical coagulant ?
Pick out the one which is not a chemical coagulant ?A. Aluminium sulphate
B. Ferrous sulphate
C. Hydrated lime
D. ChloramineCarbonaceous particles having size less than 1 μm are called___________________?
Carbonaceous particles having size less than 1 μm are called___________________?A. Grit
B. Aggregates
C. Aerosols
D. Smoke