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UPSC Prelims 1987Question 66Economy

A biogas plant works to its maximum capacity when

Options

  1. (a)Conditions are aerobic and temperature 40°C.
  2. (b)Conditions are anaerobic and temperature 40°C.
  3. (c)Conditions are aerobic and sewage is supplied.
  4. (d)Conditions are anaerobic and sewage is supplied.

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