GATE ES topic:global-effects-air-pollution PYQs & Answers

Questions 1–10 of 13. Imported answers require independent review unless marked reviewed.

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

Your answerSelect all correct options. You can choose more than one.

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

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

Global warming can cause sea level rise.

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

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Choose the correct option(s) from the following regarding the symbiotic relationships

Your answerSelect all correct options. You can choose more than one.

Lichens are a symbiotic association of fungi and bacteria. They can survive in extreme conditions of air pollution.

Lichens are a symbiotic association of fungi and bacteria. The fungi can absorb water and minerals from atmosphere, and bacteria can generate foods.

Lichens are a symbiotic association of fungi and algae. They can survive in extreme conditions, but are very sensitive to air pollution.

Lichens are a symbiotic association of fungi and algae. The fungi can absorb water and minerals from atmosphere, and algae can generate food through photosynthesis.

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

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

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

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

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

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

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

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

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

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

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An industry releases three greenhouse gases (GHGs), CO

(5 kg/day), CH

(0.5 kg/day), and N

O (0.1 kg/day). The industry flares the CH

before it is released to the atmosphere. The Global Warming Potential (GWP) are as follows: CO

= 1, CH

= 21, N

O = 310. The annual GWP of GHGs released from the industry is ______ kg CO

equivalent. (rounded off to the nearest integer)

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Which one of the following is NOT a greenhouse gas?

Your answerChoose one option.

CO₂

CH₄

H₂S

H₂O

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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

Your answerChoose one option.

CH₄ < N₂O < CFCl₃ < CF₂Cl₂

CF₂Cl₂ < CH₄ < N₂O < CFCl₃

CH₄ < N₂O < CF₂Cl₂ < CFCl₃

N₂O < CFCl₃ < CH₄ < CF₂Cl₂

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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?

Your answerChoose one option.

only i) is TRUE

only ii) is TRUE

only i) and ii) are TRUE

only ii) and iii) are TRUE

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Which of the following statements is/are NOT true?

Your answerSelect all correct options. You can choose more than one.

Urban heat island effect in a city can be reduced by increasing trees and vegetation cover in the city.

Urban heat island intensity is affected by PM₂.₅ concentrations in a city.

Urban heat island intensity increases due to installation of reflective roofs in a city.

In comparison with the non-urban areas, urban heat island effect raises night-time temperatures more than daytime temperatures in cities.

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Products P and Q have life cycle phases of material extraction, production, use, and end of life disposal. CH

, CO

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	CO emissions, kg/tonne	CH 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	CO emissions, kg/tonne	CH 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 CH

equal to 23 kg of CO

per kg of CH

, which of the following statement(s) is/are true?

Your answerSelect all correct options. You can choose more than one.

Greenhouse gas emissions (kg CO

equivalent/f.u.) from the ‘Material extraction’ phase of product P is higher than that of product Q.

Greenhouse gas emissions (kg CO

equivalent/f.u.) from the ‘Production phase’ of product Q is higher than that of product P.

Greenhouse gas emissions (kg CO

equivalent/f.u.) from the ‘End of life disposal’ is higher for product Q than that of product P.

Greenhouse gas emissions (kg CO

equivalent/f.u.) from the ‘complete life cycle’ of the product P is higher than that of product Q.

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GATE ES topic:global-effects-air-pollution PYQs

How to practice topic:global-effects-air-pollution

Question 32

Question 30

Question 31

Question 32

Question 64

Question 21

Question 24

Question 25

Question 44

Question 46