This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Biodegradable Polymers”.
1. Which of the following is not required for the biodegradation process?
a) Micro-organism
b) Environment conditions
c) Adhesives
d) Substrate
View Answer
Explanation: There are three essential conditions for the biodegradable process, micro-organism, environment and substrate. Micro-organisims biodegrade the substrate in the presence of a suitable environment.
2. Greater the hydrophilicity of the polymers ____________ is the rate of biodegradation.
a) Larger
b) Smaller
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Explanation: Greater the hydrophilicity of the polymers, larger is the rate of biodegradation. Biodegradation increases with more hydrophilicity. Hydrophilicity means having an affinity for water; readily absorbing or dissolving in water.
3. Biodegradation will be more for ____________
a) More molecular weights and high crystallinity
b) Low molecular weights and high crystallinity
c) More molecular weights and less crystallinity
d) Low molecular weights and less crystallinity
View Answer
Explanation: Biodegradation will be more for low molecular weights and less crystallinity. Low molecular weight compound can easily be broken into pieces by micro-organisms and hence improve the rate of biodegradation.
4. Which of the following is not an example of a natural biodegradable polymer?
a) Collagen
b) Polyvinyl alcohol
c) Lignin
d) Natural rubber
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Explanation: Collagen, natural rubber, lignin etc are some of the examples of natural biodegradable polymer. Polyvinyl alcohol is not an example of a natural biodegradable polymer.
5. Which of the following is not an example of synthetic biodegradable polymer?
a) Polyvinyl alcohol
b) Poly gamma-glutamic acid
c) Polyanhydrides
d) PHBV
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Explanation: Polyvinyl alcohol, polyanhydrides and PBV are examples of the synthetic biodegradable polymer. Poly gamma-glutamic acid is not an example of a synthetic biodegradable polymer.
6. Biodegradable polymers do not need to be land-filled, they will re-enter normal geo-chemical cycles over time.
a) True
b) False
View Answer
Explanation: Biodegradable polymers do not need to be land-filled, they will re-enter normal geo-chemical cycles over time. They are easily decomposed in the natural environment and does not require any external agent.
7. PHB is used in ____________
a) Agricultural applications
b) Medical applications
c) Manufacture of shampoo bottles
d) Adhesives
View Answer
Explanation: PHB is used in manufacture of shampoo bottles. Polyhydroxybutyrate (PHB) is a polyhydroxyalkanoate (PHA), a polymer belonging to the polyesters class that are of interest as biodegradable plastics.
8. Select the incorrect statement from the following option.
a) Biodegradable polymers are not suitable candidates in the recycling of commingled plastics
b) Biodegradable polymers are very expensive
c) Biodegradable polymers are an attractive option for addressing the solid waste and marine pollution
d) Biodegradable polymers are easily available
View Answer
Explanation: Biodegradable polymers are not easily available. All the other options are correct. Biodegradable polymers are not suitable candidates in the recycling of commingled plastics. They are very expensive but an attractive option for addressing solid waste and marine pollution.
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