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Question 1:

Naphtha, lacquer thinner, epoxy resins, adhesives and oil based paints are all examples of

Question 2:

Which one of the following wastes can be broken down into simpler substances naturally?

Question 3:

Composting is the purposeful biodegradation of organic matter, such as yard and food waste. In case of anaerobic decomposition which of the following gas is /are formed?

  1. Methane gas
  2. Oxygen gas
  3. Ammonia gas
  4. Hydrogen sulphide gas

Question 4:

Grit chamber is essential because

  1. Grit particles cause abrasion 
  2. To avoid blocking of pipelines 
  3. To enhance blocking of pipelines
  4. Increase the damage of mechanical equipment

Question 5:

Recycle means taking something old and making it into something new. Which of the following statement is NOT true about it?