10th Class Science Sources of Energy Question Bank Self Test-4

  • question_answer
    How much time does a biogas plant take to become operative?

    A)  10 to 20 days

    B)  20 to 30 days

    C)  30 to 40 days

    D)  50 to 60 days

    E)  None of these

    Correct Answer: D

    Solution :


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