Chemical Environmental Engineering

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

Byadmin March 11, 2019August 29, 2021

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

A. 1-2
B. 5-10
C. 90-120
D. 1500-2500

Chemical Environmental Engineering

A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?

A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?

A. Hydrogen
B. Carbon dioxide
C. Ozone
D. None of these

Read More A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?
Chemical Environmental Engineering

Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?

Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?

A. Poor visibility due to sky darkening
B. Irritation in eyes
C. Respiratory trouble
D. All A., B. and C.

Read More Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?
Chemical Environmental Engineering

Which of the following sources is responsible for maximum air pollution ?

Which of the following sources is responsible for maximum air pollution ?

A. Industrial chimney exhaust
B. Forest fire
C. Automobiles exhaust
D. Photochemical oxidation of organic matter

Read More Which of the following sources is responsible for maximum air pollution ?
Chemical Environmental Engineering

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?

A. I-131
B. Sr-90
C. Au-198
D. Ra-226

Read More Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?
Chemical Environmental Engineering

Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?

Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?

A. Chemical coagulation
B. Floatation & skimming
C. Centrifugation
D. Ultra filtration

Read More Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?
Chemical Environmental Engineering

In water treatment plant, zeolite process is used to remove the _____________ of water?

In water treatment plant, zeolite process is used to remove the _____________ of water?

A. Acidity
B. Alkalinity
C. Hardness
D. Iron & zinc

Read More In water treatment plant, zeolite process is used to remove the _____________ of water?