Engineering Questions with Answers - Multiple Choice Questions

Environmental Engineering MCQ – Air Pollutants

1 - Question

 Which gas is mainly produced due to incomplete burning of wood?
a) CO
b) SO2
c) NO2
d) NO3

View Answer

Answer: a
Explanation: CO is the colorless, odorless, toxic gas produced due to incomplete burning of wood.




2 - Question

Which of the following is involved in production of carboxy haemoglobin?
a) CO
b) SO2
c) NO2
d) NO3

View Answer

Answer: a
Explanation: CO + Blood ——> Carboxy haemoglobin (Pink color).




3 - Question

Which of the following is a liquid form of aerosol?
a) Fume
b) Dust
c) Mist
d) Smoke

View Answer

Answer: c
Explanation: Mist is a liquid form of aerosol whereas, Fume, Dust and Smoke are a solid form of aerosol.




4 - Question

X ray films are a source of which of the following gas?
a) SO2
b) CO2
c) NO2
d) SO3

View Answer

Answer: c
Explanation: NO2 is produced from X ray film. It causes irritation to eyes and cause respiratory disease.




5 - Question

The maximum size of fly ash is ___________
a) 1μm
b) 100μm
c) 1000μm
d) 10μm

View Answer

Answer: c
Explanation: Fly ash is a finely divided particle produced from the combustion of coal. Its maximum size is 1000μm.




6 - Question

Which of the following leads to a disease called broncho spasm?
a) SO2
b) SO3
c) SO4
d) CO2

View Answer

Answer: b
Explanation: SO3 reacts with body fluids forming H2SO4 leading to Broncho spasm.




7 - Question

The minimum size of the smoke particle is ___________
a) 0.2μm
b) 1μm
c) 0.8μm
d) 0.5μm

View Answer

Answer: d
Explanation: Smoke is produced due to incomplete combustion of coal. Its size lies between 0.5μm to 1μm.




8 - Question

Which of the following is a secondary air pollutant?
a) SPM
b) PAN
c) SO2
d) NO2

View Answer

Answer: b
Explanation: Peroxy Acetyl Nitrate is a secondary air pollutant whereas, Suspended Particulate Matter, SO2 and NO2 are primary air pollutants.




9 - Question

 The permissible concentration of PM 10 in the air is ___________
a) 60μg/m3
b) 40μg/m3
c) 50μg/m3
d) 20μg/m3

View Answer

Answer: a
Explanation: The permissible concentration of PM 10 in air is 60μg/m3 whereas of PM 2.5 is 40μg/m3.

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