Global effects of air pollution - Global and Regional Environmental Issues - Environmental Science & Engineering Previous Year Questions

1

2024 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2024

Which one of the following is NOT a greenhouse gas?

A

CO₂

B

CH₄

C

H₂S

D

H₂O

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2

2025 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2025

Methane hydrates have special crystal structure of water, where methane gas molecules are trapped. Choose the correct option(s) from the following

A

Methane hydrates exist in abundance near the ocean bed, where the pressure is high enough for their existence.

B

Methane hydrates exist in abundance in the polar regions, where the temperature is low enough for their existence.

C

Methane hydrates can be a huge source of energy, but can accelerate global warming considerably if the entrapped methane is released to the atmosphere.

D

Methane hydrates can be a huge source of energy, but difficult to exploit commercially.

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3

2025 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2025

Choose the correct option(s) from the following regarding urban environment

A

Urban heat island can exacerbate urban flooding by intensifying rainfall intensity.

B

Urban canyons increase ventilation by trapping heat and thus enhancing urban heat island effect.

C

Program evaluation and review technique (PERT) is always used to estimate the economic impact of mitigation strategies for urban heat island effect.

D

In general, land surfaces in urban areas emit more long wave radiation compared to those in rural areas, and thus contribute to higher night time temperature.

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4

2025 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2025

An industry releases three greenhouse gases (GHGs). CO₂ (5 kg/day), CH₄ (0.5 kg/day), and N₂O (0.1 kg/day). The industry flares the CH₄ before it is released to the atmosphere. The Global Warming Potential (GWP) are as follows: CO₂ = 1, CH₄ = 21, N₂O = 310. The annual GWP of GHGs released from the industry is ______ kg CO₂ equivalent. (rounded off to the nearest integer)

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5

2021 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2021

Which of the following is/are both greenhouse gas(es) and ozone depleting substance(s)?

A

CFC-11

B

CO₂

C

HCFC-22

D

N₂O

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6

2022 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2022

Which one of the following statements is correct regarding Global warming?

A

Water vapour does not contribute to global warming.

B

Global warming is likely to increase the productivity of plants due to CO₂ fertilization.

C

CFCs do not cause global warming, but can cause ozone layer depletion in stratosphere.

D

HFCs and HCFCs are good substitutes for the ozone depleting substances as they cause neither global warming nor ozone layer depletion.

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7

2023 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2023

The correct ascending order of the following greenhouse gases with respect to their global warming potential relative to CO₂ in the time horizon of 100 years is

A

CH₄ < N₂O < CFCl₃ < CF₂Cl₂

B

CF₂Cl₂ < CH₄ < N₂O < CFCl₃

C

CH₄ < N₂O < CF₂Cl₂ < CFCl₃

D

N₂O < CFCl₃ < CH₄ < CF₂Cl₂

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8

2023 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2023

Read the following statements with reference to the Kyoto Protocol on Climate Change
i) Each signatory (country) has common and equal responsibility.
ii) Clean development mechanism (CDM), joint implementation (JI) and international emission trading are the three mechanisms under Kyoto Protocol to reduce the greenhouse gas emissions.
iii) Under Kyoto Protocol, India has agreed to reduce its greenhouse gas emissions by half by 2050 as compared to 2005 emissions.
Which one of the following is correct choice?

A

only i) is TRUE

B

only ii) is TRUE

C

only i) and ii) are TRUE

D

only ii) and iii) are TRUE

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9

2023 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2023

Products P and Q have life cycle phases of material extraction, production, use, and end of life disposal. CH₄, CO₂ emissions and mass used per functional unit (f.u.) from the different phases of the products are given in the following tables.

Product P

Phase	CO2 emissions, kg/tonne	CH4 emissions, kg/tonne	Mass, tonne/functional unit (f.u.)
Material Extraction	1.0	0.75	4.0
Production	1.5	1.0	2.0
Use	0.5	0.0	1.0
End of life disposal	1.0	0.25	1.0

Product Q

Phase	CO2 emissions, kg/tonne	CH4 emissions, kg/tonne	Mass, tonne/functional unit (f.u.)
Material Extraction	0.75	0.75	3.0
Production	0.25	1.0	2.5
Use	0.0	0.5	0.75
End of life disposal	2.0	0.0	0.75

Based upon the information given in the tables and using global warming potential of CH₄ equal to 23 kg of CO₂ per kg of CH₄, which of the following statement(s) is/are true?

A

Greenhouse gas emissions (kg CO₂ equivalent/f.u.) from the ‘Material extraction’ phase of product P is higher than that of product Q.

B

Greenhouse gas emissions (kg CO₂ equivalent/f.u.) from the ‘Production phase’ of product Q is higher than that of product P.

C

Greenhouse gas emissions (kg CO₂ equivalent/f.u.) from the ‘End of life disposal’ is higher for product Q than that of product P.

D

Greenhouse gas emissions (kg CO₂ equivalent/f.u.) from the ‘complete life cycle’ of the product P is higher than that of product Q.

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10

2026 · Environmental Science & Engineering · Global and Regional Environmental Issues · Global effects of air pollution

Environmental Science & Engineering (ES) 2026

Which of the following statements is/are TRUE about global warming?

A

Interception of incoming solar radiation by greenhouse gases in earth’s atmosphere is responsible for global warming.

B

Interception of outgoing longwave radiation by greenhouse gases in earth’s atmosphere is responsible for global warming.

C

Global warming can cause sea level rise.

D

Carbon dioxide is one of the major greenhouse gases in earth’s atmosphere responsible for global warming.

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