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Environmental Engg mcq. We covered all the Environmental Engg mcq in this post for free so that you can practice well for the exam.
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mcq on Environmental Engg for Students
Why is ozone considered a vital component of the stratosphere?
(a) It eliminates harmful bacteria
(b) It reduces smog formation over urban areas
(c) It reacts with and removes toxic gases
(d) It filters out ultraviolet rays dangerous to life
Option d – It filters out ultraviolet rays dangerous to life
What is true about sulfur dioxide (SO₂) as an air pollutant?
(a) It causes respiratory irritation
(b) It contributes to Acid rain
(c) Both (a) and (b)
(d) Neither of the above
Option c – Both (a) and (b)
When does London-type smog typically occur?
(a) Winter during daytime
(b) Summer during daytime
(c) Summer in the early morning
(d) Winter in the early morning
Option d – Winter in the early morning
Which are the secondary pollutants in photochemical smog?
(a) SO₂ and NO₂
(b) SO₂ and Hydrocarbons
(c) NO₂ and Hydrocarbons
(d) O₃ and PAN
Option d – O₃ and PAN
Supersonic aircrafts emit which gas that depletes ozone?
(a) Carbon monoxide
(b) Nitric oxide
(c) Sulfur dioxide
(d) Oxygen
Option b – Nitric oxide
Why is carbon monoxide hazardous to humans?
(a) It produces carbolic Acid
(b) It leads to excessive CO₂ production
(c) It causes cancer
(d) It hinders oxygen Transport by binding with hemoglobin
Option d – It hinders oxygen Transport by binding with hemoglobin
What causes the greenhouse effect in Earth’s Atmosphere?
(a) The presence of gases that absorb infrared radiation
(b) Only due to CO₂ in the air
(c) Because of ozone and methane
(d) Due to nitrous oxide and chlorofluorocarbons
Option a – The presence of gases that absorb infrared radiation
What causes the reddish haze in crowded, traffic-heavy areas?
(a) Sulfur oxides, smoke, and smog
(b) Only carbon dioxide
(c) Nitrogen oxides
(d) Nitrogen oxides and smog
Option c – Nitrogen oxides
Classical smog typically forms in conditions of
(a) Excess sulfur dioxide
(b) Low temperatures
(c) High temperatures
(d) Excess ammonia
Option b – Low temperatures
Which substances are primarily responsible for smog?
(a) Sulfur and nitrogen oxides
(b) Oxygen and nitrogen
(c) Oxygen and ozone
(d) Ozone and nitrogen
Option a – Sulfur and nitrogen oxides
What is the major air contaminant in Indian metro cities like Delhi?
(a) Suspended particulate Matter
(b) Sulfur oxides
(c) Carbon dioxide and carbon monoxide
(d) Nitrogen oxides
Option a – Suspended particulate Matter
Which harmful element in CFCs contributes to ozone layer depletion?
(a) Sulfur dioxide
(b) Fluorine
(c) Chlorine
(d) Nitrogen dioxide
Option c – Chlorine
What compound is linked with ozone thinning in Antarctica?
(a) Acrolein
(b) Peroxyacetyl nitrate
(c) Sulfur oxides
(d) Chlorine nitrate
Option d – Chlorine nitrate
Which of the following is not generally considered a pollutant?
(a) Nitrogen dioxide
(b) Carbon dioxide
(c) Ozone
(d) Hydrocarbons
Option b – Carbon dioxide
The Acid found in the highest amount in Acid rain is
(a) Carbonic Acid
(b) Nitric Acid
(c) Hydrochloric Acid
(d) Sulfuric Acid
Option d – Sulfuric Acid
What are the main elements found in smog?
(a) Ozone and PAN
(b) Oxygen
(c) PAN
(d) PPN and PBN
Option a – Ozone and PAN
Why is the increased use of disposable packaging a concern for the Environment?
(a) Because of ease of use
(b) Due to the growth of non-biodegradable waste
(c) As they are safe and clean
(d) All of the above
Option b – Due to the growth of non-biodegradable waste
What is DDT classified as?
(a) Greenhouse gas
(b) Fertilizer
(c) Biodegradable waste
(d) Non-biodegradable waste
Option d – Non-biodegradable waste
Which statement does not relate to how ozone forms?
(a) Ozone is toxic
(b) UV rays break oxygen molecules into atoms
(c) Oxygen atoms combine with oxygen to create ozone
(d) Ozone is generated in upper atmospheric levels
Option a – Ozone is toxic
Why is protecting the ozone layer essential?
(a) It blocks dangerous ultraviolet rays
(b) It is threatened by chlorofluorocarbons
(c) Both (a) and (b)
(d) It’s unnecessary, as more ozone means more oxygen
Option c – Both (a) and (b)
How can garbage disposal be made environmentally friendly?
(a) By separating biodegradable and non-biodegradable waste
(b) By converting Organic waste into useful products
(c) By treating industrial waste and sewage before dumping
(d) All of the above
Option d – All of the above
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