GATE ES topic:environmental-engineering PYQs & Answers — Page 10

Questions 91–100 of 390. Imported answers require independent review unless marked reviewed.

Consider the following statements related to nitrification process:

(i) Electron acceptor type vary depending on whether nitrosomonas or nitrobacter is involved. (ii) Predominant carbon source is organic matter. (iii) Predominant carbon source is inorganic carbon. (iv) Electron donor during conversion of ammonium ions to nitrite ions is ammonium ions.

Choose the correct option(s) from the following

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(iii) and (iv) are correct

(i) and (ii) are correct

(i) is incorrect and (iii) is correct

(ii) is correct and (iii) is incorrect

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Stable burning results in release of particulate matter, volatile organic compounds, oxides of nitrogen and sulfur, to name a few. A researcher is planning to use a conventional Gaussian dispersion model to estimate the contribution of stubble burning in a nearby state to air pollution in New Delhi.

Choose the option(s) which could explain the possible limitations in this approach

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assumption of steady state conditions e.g. constant wind speed, wind direction, and emission, etc. in conventional Gaussian dispersion models

non-accounting of wet and dry deposition in conventional Gaussian dispersion models

non-handling of chemical transformation of pollutants in conventional Gaussian dispersion models

requirement of more computational resources by conventional Gaussian dispersion models compared to chemical transport models

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Choose the correct option(s) from the following in the plastic waste management

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Plastic wastes may be burnt to generate fuel oil and fuel gas.

Plastic wastes along with bitumen may be used for road/pavement construction.

Polyethylene terephthalate (PET) and high density polyethylene (HDPE) are the most common plastics for recycling.

Plastics made of branched monomers can be easily recycled.

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Choose the option(s) giving the correct process flow-sheet for producing refuse derived fuel (RDF) from the segregated waste collected in the dry waste containers (blue coloured containers of the municipal solid waste (MSW) collection scheme).

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Diagram for Environmental Science and Engineering question 29

Diagram for Environmental Science and Engineering question 29 (figure 2)

Diagram for Environmental Science and Engineering question 29 (figure 3)

Diagram for Environmental Science and Engineering question 29 (figure 4)

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

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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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Choose the correct option(s) from the following regarding cumulative toxicity

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Bioaccumulation is the process by which a living organism keeps on accumulating pollutants in its body due to continuous exposure, whereas, bio-magnification is the process by which higher order organisms accumulate more pollutants than the lower order organisms in a food chain.

Biomagnification is the process by which a living organism keeps on accumulating pollutants in its body due to continuous exposure, whereas, bioaccumulation is the process by which higher order organisms accumulate more pollutants than the lower order organisms in a food chain.

Bioaccumulation and biomagnification are possible with heavy metals, but not with pesticides and pharmaceutical compounds.

Bioaccumulation and biomagnification are possible with heavy metals, pesticides and pharmaceutical compounds.

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is ____________ (rounded off to two decimal places).

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An unconfined aquifer of areal extent 20 km × 20 km has hydraulic conductivity of 4 m/day, porosity of 0.32, and storage coefficient (specific yield) of 0.18. If the initial saturated thickness of the aquifer is 30 m, and 4×10⁸ m³ of water is extracted from the aquifer, then the decline in the saturated thickness is ____________ m. (rounded off to two decimal places)

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GATE ES topic:environmental-engineering PYQs

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35