CERTFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
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1. What is the primary goal of waste management?
A. Increase landfill size
B. Maximize waste burning
C. Reduce environmental impact of waste
D. Increase waste production
Rationale: Waste management focuses on minimizing
environmental harm through proper handling, recycling, and
disposal.
Correct Answer: C
2. Which of the following is considered hazardous waste?
A. Paper
B. Food scraps
C. Used motor oil
D. Cardboard
Rationale: Hazardous waste includes materials that are toxic or
harmful to health and environment.
Correct Answer: C
,3. What does “3Rs” in waste management stand for?
A. Reuse, Reduce, Refill
B. Reduce, Reuse, Recycle
C. Remove, Reuse, Restore
D. Reduce, Reclaim, Replace
Rationale: The 3Rs promote waste minimization and resource
conservation.
Correct Answer: B
4. Which color bin is commonly used for recyclable waste in
many systems?
A. Red
B. Blue
C. Black
D. Brown
Rationale: Blue bins are widely used for recyclables such as
paper and plastics.
Correct Answer: B
5. What is landfill leachate?
A. Clean rainwater
B. Gas from decomposition
,C. Contaminated liquid from waste
D. Recycled water
Rationale: Leachate forms when water filters through waste
and picks up contaminants.
Correct Answer: C
6. Which gas is primarily produced in landfills?
A. Oxygen
B. Methane
C. Nitrogen
D. Helium
Rationale: Methane is produced by anaerobic decomposition of
organic waste.
Correct Answer: B
7. Incineration of waste mainly helps to:
A. Increase landfill waste
B. Reduce waste volume
C. Create plastic
D. Produce compost only
Rationale: Incineration burns waste and significantly reduces its
volume.
Correct Answer: B
, 8. Composting is best suited for:
A. Metal waste
B. Organic waste
C. Glass waste
D. Electronic waste
Rationale: Organic waste decomposes naturally into compost.
Correct Answer: B
9. What is e-waste?
A. Organic food waste
B. Electronic waste
C. Industrial sludge
D. Medical waste only
Rationale: E-waste includes discarded electronics like phones
and computers.
Correct Answer: B
10. Which practice reduces landfill use the most?
A. Burning waste
B. Recycling materials
C. Dumping waste in rivers
D. Burying untreated waste