2. Sample Papers
  3. Railways
  4. General Science & Technology
  5. Pollution of Air and Water

Railways General Science & Technology Pollution of Air and Water Sample Paper Air Pollution Sample Test Paper-20

  • question_answer
    Which of the following is a greenhouse gas?

    A)  Methane

    B)         Oxygen

    C)  Nitrogen           

    D)  Hydrogen

    Correct Answer: A

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