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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 101

Which is the main component of biogas?

  1. Propane
  2. Butane
  3. Ethane
  4. Methane
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (D) Methane

Explanation

Biogas from anaerobic digestion is mostly methane with carbon dioxide.

  • (A) Incorrect

    Wrong: a component of LPG.

  • (B) Incorrect

    Wrong: a component of LPG.

  • (C) Incorrect

    Wrong: minor in natural gas.

  • (D) Correct

    Correct: biogas is about 50–75% methane.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.