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Polymer Technology
Comments
Question
Vulcanisation of rubber does not increase its
Options
A. elasticity
B. plasticity
C. ductility
D. none of these
Correct Answer
plasticity
Polymer Technology problems
Search Results
1. Properties of a polymer is affected by the
Options
A. chain length.
B. intermolecular forces.
C. branching & cross-linking.
D. all (a), (b).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b).
2. Thermosplastic materials
Options
A. do not soften on application of heat.
B. are heavily branched molecules.
C. are solvent insoluble.
D. none of these.
Show Answer
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Discuss
Correct Answer: none of these.
3. The generic chemical name for the class of polymers which are commerically known as nylons is
Options
A. polyolefins
B. polyamide
C. polyacrylate
D. polyurathane
Show Answer
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Discuss
Correct Answer: polyamide
4. Poly tetra flouro ethylene (PTFE) is known as
Options
A. dacron
B. teflon
C. bakelite
D. celluloid
Show Answer
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Discuss
Correct Answer: teflon
5. In condensation polymerisation as compared to addition polymerisation
Options
A. the monomers are unsaturated compounds.
B. no co-product is lost.
C. the monomers contain two functional groups.
D. generally only one monomer is involved
Show Answer
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Discuss
Correct Answer: the monomers contain two functional groups.
6. Synthetic rubber
Options
A. deforms, if stretched to double of its original dimension.
B. is brittle at low temperature
C. is softer at higher temperature.
D. is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases.
Show Answer
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Discuss
Correct Answer: is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases.
7. Bakelite is
Options
A. same as polytetra flouro ethylene (PTFE).
B. an inorganic polymer.
C. same as thermoset phenol formaldehyde.
D. not a polymer.
Show Answer
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Discuss
Correct Answer: same as thermoset phenol formaldehyde.
8. Unbreakable crockeries are made from __________ polymers.
Options
A. polystyrene
B. melamine
C. polystyrene
D. polyurathane
Show Answer
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Discuss
Correct Answer: melamine
9. Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.
Options
A. -20 to 25
B. 50 to 75
C. 100 to 150
D. 250-280
Show Answer
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Discuss
Correct Answer: 250-280
10. In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer?
Options
A. PTFE
B. Buna-S
C. PMMA
D. Polycaprolactum
Show Answer
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Discuss
Correct Answer: Buna-S
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