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2019 · Q26Environment & EcologyRenewable Energy & Green Technologieseasy

In the context of which one of the following are the terms 'pyrolysis and plasma gasification' mentioned?

  1. (a)Extraction of rare earth elements
  2. (b)Natural gas extraction technologies
  3. (c)Hydrogen fuel-based automobiles
  4. (d)Waste-to-energy technologies
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Official answer(d) Waste-to-energy technologies

2025 · Q9Environment & EcologyRenewable Energy & Green Technologieseasy

Consider the following statements : Statement I : Circular economy reduces the emissions of greenhouse gases. Statement II : Circular economy reduces the use of raw materials as inputs. Statement III : Circular economy reduces wastage in the production process. Which one of the following is correct in respect of the above statements?

  1. (a)Both Statement II and Statement III are correct and both of them explain Statement I
  2. (b)Both Statement II and Statement III are correct but only one of them explains Statement I
  3. (c)Only one of the Statements II and III is correct and that explains Statement I
  4. (d)Neither Statement II nor Statement III is correct
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Official answer(a) Both Statement II and Statement III are correct and both of them explain Statement I

2025 · Q63Environment & EcologyRenewable Energy & Green Technologiesmoderate

Consider the following statements : Statement I : Of the two major ethanol producers in the world, i.e., Brazil and the United States of America, the former produces more ethanol than the latter. Statement II : Unlike in the United States of America where corn is the principal feedstock for ethanol production, sugarcane is the principal feedstock for ethanol production in Brazil. Which one of the following is correct in respect of the above statements?

  1. (a)Both Statement I and Statement II are correct and Statement II explains Statement I
  2. (b)Both Statement I and Statement II are correct but Statement II does not explain Statement I
  3. (c)Statement I is correct but Statement II is not correct
  4. (d)Statement I is not correct but Statement II is correct
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Official answer(d) Statement I is not correct but Statement II is correct

2020 · Q78Environment & EcologyRenewable Energy & Green Technologiesmoderate

In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint ? 1. Copper slag 2. Cold mix asphalt technology 3. Geotextiles 4. Hot mix asphalt technology 5. Portland cement Select the correct answer using the code given below :

  1. (a)1, 2 and 3 only
  2. (b)2, 3 and 4 only
  3. (c)4 and 5 only
  4. (d)1 and 5 only
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Official answer(a) 1, 2 and 3 only