UPSC Prelims GS - 2019

Question 66
EASYCorrect: +2Incorrect: -2

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