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GATE 2022 CE (CE2) – Question 26

Air Pollution and Municipal Solid Wastes · Municipal solid wastes: generation, collection, transportation and management · 1 mark · Multiple select

In a solid waste handling facility, the moisture contents (MC) of food waste, paper waste, and glass waste were found to be MCf, MCp, and MCg, respectively. Similarly, the energy contents (EC) of plastic waste, food waste, and glass waste were found to be ECpp, ECf, and ECg, respectively. Which of the following statement(s) is/are correct?

  1. MCf > MCp > MCg
  2. ECpp > ECf > ECg
  3. MCf < MCp < MCg
  4. ECpp < ECf < ECg

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Show answer and explanation

Correct answer: (A) MCf > MCp > MCg; (B) ECpp > ECf > ECg

Explanation

Food waste usually contains the most moisture; paper is drier and glass has negligible inherent moisture. Thus MCf>MCp>MCg.

Plastic has high calorific value, food waste has less, and glass is noncombustible. Therefore ECpp>ECf>ECg. **Answer: A and B**.