Environmental Engineering MCQ Questions & Answers | Chemical Engineering

A. I-131

B. Sr-90

C. Au-198

D. Ra-226

A. Automobile exhaust

B. Blanketing effect of CO₂ in the atmosphere

C. De-forestation

D. Thickening of ozone layer

A. Bacterial stability factor

B. Relative stability

C. Biological oxygen demand (BOD)

D. Oxygen ion concentration

A. Combustibles present in automobile exhaust

B. Smoke density from a chimey

C. Exhaust gas density

D. Flue gas temperature

A. Positively charged

B. Negatively charged

C. Neutral

D. Combination of all A, B & C

A. Biological oxygen demand (BOD) is a characteristic and not a constituent of water

B. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organi

C. BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water)

D. None of these

A. Grey

B. Dark brown

C. Red

D. Black

A. 0.001 to 0.01

B. 02 to 0.3

C. 2 to 3

D. 5 to 10

A. Grit

B. Aggregates

C. Aerosols

D. Smoke

A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust

B. NO₂ is capable of penetrating the troposphere and can absorb both ultraviolet & visible light

C. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees

D. H₂S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO₂