GATE ES concept:global-warming PYQs & Answers

Questions 1–6 of 6. 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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Methane hydrates have special crystal structure of water, where methane gas molecules are trapped. Choose the correct option(s) from the following

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

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

Your answerChoose one option.

Water vapour does not contribute to global warming.

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

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

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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GATE ES concept:global-warming PYQs

How to practice concept:global-warming

Question 32

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Question 25