GATE ES format:msq PYQs & Answers — Page 5

Questions 41–50 of 68. Imported answers require independent review unless marked reviewed.

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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Read the following statements about aerobic composting of organic fraction of municipal solid waste

I. The majority of the odor problem in aerobic composting process is due to the development of anaerobic conditions within the compost pile.

II. All organic carbon present in the waste will completely biodegrade in 14 days.

III. At high C/N ratio, ammonia would be released and biological activity may also be impeded.

IV. Optimum moisture content for aerobic composting process would be 50–60%. Lower moisture would slow down the biological process. Excessive moisture will make it difficult to maintain aerobic conditions.

The correct choice(s) is/are

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

I and IV are correct

II and III are incorrect

I is correct; IV is incorrect

II is correct; IV is incorrect

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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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If G represents Gibbs free energy, select the correct statement(s)

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

If ΔG = 0, reaction will proceed only in one direction

If ΔG = 0, reaction will be in equilibrium

If ΔG < 0, reaction will proceed forward

If ΔG > 0, reaction will not proceed forward

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For effluents generated by a molasses based distillery and wood based pulp and paper industry, which of the following statement(s) is/are NOT correct?

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

Both the effluents have dark colour.

Both the effluents have high toxicity.

Both the effluents generally have BOD greater than 15,000 ppm.

Both the effluents have high pH.

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PM₂.₅ concentrations in ambient air can be measured using

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

Beta attenuation method

Chemiluminescence method

Gravimetric method

Non dispersive infrared spectroscopy method

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Biodegradable wastes like vegetable peels from kitchen are usually processed by composting techniques. Which of the following option(s) regarding the process of biodegradable wastes is/are correct?

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

Vermi-composting is relatively faster than window composting, however vermi-composting is not frequently used on large commercial scale.

The window height should be as short as possible as large window height may cause compaction due to the self-weight.

The window height should be as large as possible as that will help to ensure appropriate temperature within the window.

Earthworms facilitate the growth of microorganisms and break down complex organic molecules to simpler ones using enzymatic secretions.

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As per ‘Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016 of Govt. of India, the import of hazardous and other wastes from any country shall NOT be permitted for which of the following option(s)?

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

Recovery, reuse and recycle

Disposal in abandoned mines

Safe disposal in engineered landfills

Utilization, including co-processing

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The Ministry of Environment, Forest and Climate Change (MoEF&CC), Govt. of India has published the Environment Impact Assessment (EIA) draft Notification 2020, intended to replace the existing EIA Notification, 2006 under the Environment (Protection) Act, 1986. Which of the following is/are the key change(s) from existing regulation?

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

Removal of several project/ activities from the purview of public consultation.

A list of projects has been included under Category B2, expressly exempted from the requirement of an EIA.

All the project related activities are brought under the purview of necessary public consultation.

A list of projects has been included under Category B2, bring them under the requirement of detailed EIA.

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During night, in troposphere, which of the following is/are NOT correct

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

NO₂ + hν → NO + O

Most of the NOₓ (i.e., NO + NO₂) converts to NO

NO + O₃ → NO₂ + O₂

Most of the NOₓ (i.e., NO + NO₂) converts to NO₂

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GATE ES format:msq PYQs

Question 44

Question 45

Question 46

Question 28

Question 29

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Question 31

Question 32

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Question 43