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2024 · Q46Science & TechnologyEnergy & Environmentmoderate

Consider the following materials : 1. Agricultural residues 2. Corn grain 3. Wastewater treatment sludge 4. Wood mill waste Which of the above can be used as feedstock for producing Sustainable Aviation Fuel ?

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

2026 · Q70Science & TechnologyEnergy & Environmentmoderate

Which of the following statements with regard to Green Hydrogen is/are correct ? 1. It is decarbonized hydrogen obtained from natural gas reforming combined with carbon capture and storage (CCS). 2. It is produced using electrolysis of water with electricity generated by renewable energy. 3. National Green Hydrogen Mission of India aims for abatement of nearly 50 MMT of annual greenhouse gas emissions by 2030. Select the answer using the code given below :

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

2024 · Q31Science & TechnologyEnergy & Environmentmoderate

With reference to radioisotope thermoelectric generators (RTGs), consider the following statements : 1. RTGs are miniature fission reactors. 2. RTGs are used for powering the onboard systems of spacecrafts. 3. RTGs can use Plutonium-238, which is a by-product of weapons development. Which of the statements given above are correct ?

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

2023 · Q55Science & TechnologyEnergy & Environmentmoderate

With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements : 1. Biofilters provide waste treatment by removing uneaten fish feed. 2. Biofilters convert ammonia present in fish waste to nitrate. 3. Biofilters increase phosphorus as nutrient for fish in water. How many of the statements given above are correct?

  1. (a)Only one
  2. (b)Only two
  3. (c)All three
  4. (d)None
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Official answer(b) Only two