NPTEL Plastic Waste Management Week 6 Assignment Answers 2025
1. Which of the following process (es) is/are a part of mechanical recycling of plastics?
a. Segregation
b. Pelletization
c. Extrusion
d. All the above
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2. During which process (es) does the plastic undergo molecular and structural level changes to
produce products with unique properties than the raw materials?
a. Incineration
b. Mechanical Recycling
c. Feedstock Recycling
d. All of the above
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3. The solid phase product produced during pyrolysis of plastics is called as?
a. Synsolid
b. Char
c. Biocoal
d. Ash
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4. The thermal degradation of plastic waste with continuous supply of oxygen is called as?
a. Pyrolysis
b. Gasification
c. Incineration
d. Mechanical Recycling
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5. Which of the following is not a feed point for the plastic waste materials into the cement
production process in a cement kiln?
a. The main burner at the rotary kiln outlet end
b. The rotary kiln inlet end
c. The pre-calciner
d. Clinker
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6. Liquefied waste plastic is coated on which of this raw material of a road in the construction of a
plastic road?
a. Sand
b. Bitumen
c. Aggregate
d. Cement
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7. Which of the following tertiary treatment processes is the most efficient micro plastics
treatment mechanism in waste water treatment plant?
a. Membrane bioreactor
b. Disc filter
c. Rapid sand filter
d. Dissolved air floatation
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8. Incineration of polystyrene produces which of the following toxic gases
a. Ethylene
b. Methane
c. Styrene
d. All of the above
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9. The basic process of laying a plastic road follows which of these sequences
a) Segregation > Shredding> Cleaning
b) Cleaning> Shredding > Segregation
c) Shredding ›Segregation > Cleaning
d) Segregation > Cleaning> Shredding
Answer :-
10. Which of the following plastic waste management option is endothermic in nature?
a. Pyrolysis
b. Mechanical recycling
c. Incineration
d. Landfilling
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11. Pyrolysis of plastic waste involves breaking down of the plastics into products of only two phases: liquid and gas.
a. True
b. False
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12. By the process of incineration, high calorific value of the plastic waste produces very low
amount of energy.
a. True
b. False
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13. Landfilling is a cheapest and easiest plastic waste management option
a. True
b. False
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14. Plastic is not a very good binder
a. True
b. False
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15. After the road laying- It is opined that the first rain will trigger leaching due to the mechanical abrasion of plastic which forms as a sticky layer.
a. True
b. False
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