Engineering Chemistry Multiple Choice Questions on “Polymer Classification”.
1. A polymer is any substance made up of many repeating units called ______________
a) Resins
b) Plastic
c) Mers
d) Blocks
Answer: c
Clarification: A polymer is any substance made up of many repeating units, building blocks called mers. Polymers are made up of many many molecules all strung together to form really long chains.
2. Small molecules which combine to form polymer are called ____________
a) Resins
b) Monomers
c) Plastic
d) Blocks
Answer: b
Clarification: Small molecules which combine with each other to form polymer are called monomers. Polymers are made up of many many molecules all strung together to form really long chains.
3. Select the incorrect statement from the following options.
a) When in form ready for further working, polymers are called resins
b) The chemical process leading to the formation of polymer is known as polymerisation
c) The number of monomeric units contained in the polymer is called the degree of polymerisation
d) Due to their small size, polymers are also called micro-molecules
Answer: d
Clarification: Due to their large size, polymers are also called macro-molecules. All the other options are correct. When in form ready for further working, polymers are called resins. The chemical process leading to the formation of polymer is known as polymerisation and the number of monomeric units contained in polymer is called degree of polymerisation.
4. Below threshold degree of polymerisation (DP), the polymer does not possess any strength and exist either as liquid resin or friable powder.
a) True
b) False
Answer: a
Clarification: Below threshold degree of polymerisation, the polymer does not possess any strength and exist either as liquid resin or friable powder. The number of monomeric units contained in the polymer is called degree of polymerisation.
5. The optimum DP value of cellulose is ____________
a) 150
b) 250
c) 400
d) 500
Answer: b
Clarification: The optimum DP value of cellulose is 250. The number of monomeric units contained in the polymer is called degree of polymerisation (DP).
6. The functionality of ethylene glycol is ____________
a) 2
b) 3
c) 4
d) 5
Answer: a
Clarification: The functionality of ethylene glycol is 2. It is a colorless, odorless, viscous dihydroxy alcohol and has a sweet taste, but is poisonous if ingested.
7. Which of the following polymer is not classified under the category of configuration?
a) Syndiotactic
b) Atactic
c) Cross-linked
d) Isotactic
Answer: c
Clarification: Cross-linked polymer is not classified under the category of configuration. Syndiotactic, atactic and isotactic are classified under the category of configuration. Tacticity is the relative stereochemistry of adjacent chiral centers within a macromolecule.
8. Which of the following is not an example of semi-crystalline polymer?
a) HDPE
b) Nylon
c) Polyesters
d) LDPE
Answer: d
Clarification: LDPE is not an example of a semi-crystalline polymer. It is an example of a branched amorphous polymer. All the other options are examples of semi-crystalline polymer.
9. Styrene acrylonitrile is an example of ____________
a) Co-polymer
b) Homopolymer
c) Linear polymer
d) Amorphous polymer