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Which of the following production unit does NOT produce the substantial waste product?

  • A.Paper
  • B.Aluminium
  • C.Glass
  • D.Rubber

Answer: D

The key gives rubber as the production unit that does not produce a substantial waste product. Paper mills (black liquor and sludge), aluminium smelting (red mud and spent pot lining) and glass making (cullet and dust) are all taken to have large waste streams, while rubber processing is considered a lesser waste producer here, since scrap rubber is mostly reused or recycled. This is a matter of the setter's classification and I could not confirm it from an independent source. The explanation follows the key, option D.

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