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UPSC 2019: In the context of which one of the following are the terms ‘pyrolysis’ and ‘plasma gasification’ mentioned?
(a)Extraction of rare earth elements
(b)Natural gas extraction technologies
(c)Hydrogen fuel-based automobiles
(d)Waste-to-energy technologies
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Not attemptedCorrect Answer: (a) Extraction of rare earth elements
Pyrolysis (thermal decomposition of waste in the absence of oxygen) and plasma gasification (using an electric arc to convert waste into syngas and slag) are both advanced waste-to-energy processes that generate combustible gases for power rather than methods for rare-earth or natural-gas extraction or for running hydrogen vehicles. ([jagranjosh.com](https://www.jagranjosh.com/articles/upsc-ias-prelims-2019-gs-question-paper-1-and-answer-key-1559456035-1))
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Frequently Asked Questions
What is the correct answer to this UPSC 2019 Environment & Ecology question?▼
The correct answer is option (a): Extraction of rare earth elements. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Renewable Energy & Green Technologies question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2019, GS Paper 1, as Question 26. It falls under Environment & Ecology > Renewable Energy & Green Technologies.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Renewable Energy & Green Technologies?▼
UPSC has asked 18 questions from Renewable Energy & Green Technologies (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.