NEET Environmental Issues PYQs & Practice Questions

10 free NEET Biology questions on Environmental Issues, starting with previous year questions (2016–2023). Tap “Show answer” to check each one. No login needed.

Topics: Ozone Layer Depletion - Dobson Units · Air Pollution Control - Electrostatic Precipitator · Water Pollution - BOD · Eutrophication · Biomagnification · International Conventions · Nuclear Waste Management · International Protocols · Greenhouse Gases · Plastic Waste Management · Air Pollution Control Devices · CNG as Alternative Fuel

Q1NEET 2023Ozone Layer Depletion - Dobson Units
The thickness of ozone in a column of air in the atmosphere is measured in terms of:
- A. Decibels
- B. Decameter
- C. Kilobase
- D. Dobson units
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Answer: C — Kilobase
The thickness of the ozone layer (total ozone in a column of air) is measured in Dobson units (DU).
Q2NEET 2023Air Pollution Control - Electrostatic Precipitator
Given below are two statements: Statement I: Electrostatic precipitator is most widely used in thermal power plant. Statement II: Electrostatic precipitator in thermal power plant removes ionising radiations. In the light of the above statements, choose the most appropriate answer from the options given below.
- A. Both Statement I and Statement II are incorrect.
- B. Statement I is correct but Statement II is incorrect.
- C. Statement I incorrect but Statement II is correct.
- D. Both Statement I and Statement II are correct.
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Answer: A — Both Statement I and Statement II are incorrect.
Statement I is correct — electrostatic precipitators are widely used in thermal power plants to control particulate emissions. Statement II is incorrect — electrostatic precipitators remove particulate matter (ash, dust particles) from flue gases, not ionising radiations.
Q3NEET 2022Air Pollution Control Devices
The device which can remove particulate matter present in the exhaust from a thermal power plant is:
- A. STP
- B. Incinerator
- C. Electrostatic Precipitator
- D. Catalytic Convertor
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Answer: B — Incinerator
An Electrostatic Precipitator uses electrical charges to remove particulate matter (ash, dust) from the exhaust gases of thermal power plants, trapping over 99% of particulates.
Q4NEET 2022CNG as Alternative Fuel
The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?
- A. CNG burns more efficiently than diesel
- B. The same diesel engine is used in CNG buses making the cost of conversion low
- C. It is cheaper than diesel
- D. It cannot be adulterated like diesel
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Answer: A — CNG burns more efficiently than diesel
CNG buses require modified/different engines (not the same diesel engine), so this statement is false. CNG does burn more efficiently, is generally cheaper than diesel, and cannot be adulterated as easily as diesel, making these statements true.

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Q5NEET 2022Air pollution control devices
Given below are two statements: Statement I: In a scrubber the exhaust from the thermal plant is passed through the electric wires to charge the dust particles. Statement II: Particulate matter (PM 2.5) cannot be removed by scrubber but can be removed by an electrostatic precipitator. In the light of the above statements, choose the most appropriate answer from the options given below:
- A. Both Statement I and Statement II are correct
- B. Both Statement I and Statement II are incorrect
- C. Statement I is correct but Statement II is incorrect
- D. Statement I is incorrect but Statement II is correct
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Answer: C — Statement I is correct but Statement II is incorrect
Passing exhaust through electric wires to charge dust particles describes the working of an electrostatic precipitator, not a scrubber, making Statement I incorrect. Statement II is correct: fine particulate matter (PM 2.5) is effectively removed by an electrostatic precipitator rather than a scrubber.
Q6NEET 2022Air Pollution Control
Given below are two statements: Statements I: In a scrubber the exhaust from the thermal plant is passed through the electric wires to charge the dust particles. Statement II: Particulate matter (PM 2.5) cannot be removed by scrubber but can be removed by an electrostatic precipitator. In the light of the above statements, choose the most appropriate answer from the options given below:
- A. Both Statement I and Statement II are correct
- B. Both Statement I and Statement II are incorrect
- C. Statement I is correct but Statement II is incorrect
- D. Statement I is incorrect but Statement II is correct
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Answer: C — Statement I is correct but Statement II is incorrect
Statement I is incorrect — charging dust particles with electric wires describes an electrostatic precipitator, not a scrubber. Statement II is correct — PM2.5 is removed by electrostatic precipitators, not scrubbers.
Q7NEET 2020Montreal Protocol
Montreal protocol was signed in 1987 for control of:
- A. Transport of Genetically modified organisms from one country to another
- B. Emission of ozone depleting substances
- C. Release of Green House gases
- D. Disposal of e-wastes
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Answer: A — Transport of Genetically modified organisms from one country to another
The Montreal Protocol (1987) is an international treaty designed to phase out the production and use of substances responsible for ozone layer depletion.
Q8NEET 2020Snow blindness in polar regions
Snow-blindness in Antarctic region is due to:
- A. Freezing of fluids in the eye by low temperature
- B. Inflammation of cornea due to high dose of UV-B radiation
- C. High reflection of light from snow
- D. Damage to retina caused by infra-red rays
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Answer: A — Freezing of fluids in the eye by low temperature
Snow blindness is caused by inflammation of the cornea (photokeratitis) due to excessive exposure to UV-B radiation, which is intensified by reflection off snow in regions with a depleted ozone layer, like Antarctica.

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Q9NEET 2019International Conventions
The Earth summit held in Rio de Janeiro in 1992 was called:
- A. to assess threat posed to native species by invasive weed species
- B. for immediate steps to discontinue use of CFCs that were damaging the ozone layer
- C. to reduce CO2 emissions and global warming.
- D. for conservation of biodiversity and sustainable utilization of its benefits.
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Answer: C — to reduce CO2 emissions and global warming.
The Earth Summit in Rio de Janeiro in 1992 was held for the conservation of biological diversity and sustainable utilization of its benefits, leading to the Convention on Biological Diversity.
Q10NEET 2019Nuclear Waste Management
Which of these following methods is the most suitable for disposal of nuclear waste?
- A. Dump the waste within rocks under deep ocean
- B. Bury the waste within rocks deep below the Earth's surface
- C. Shoot the waste into space
- D. Bury the waste under antarctic ice-over
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Answer: A — Dump the waste within rocks under deep ocean
The most suitable and widely practiced method for disposal of nuclear waste is burying it deep within rock formations below the Earth's surface in secure geological repositories.

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