Chemistry

Polymers and Plastics

1,228 Questions

Polymers and plastics questions explore the properties, synthesis, and applications of various synthetic and natural polymers. Key topics include biodegradable plastics, vulcanization, and polymer nanocomposites. These concepts are frequently tested in science and engineering competitive exams.

Biodegradable plasticsPolymer nanocompositesVulcanization of rubberPolymer molecular weightAsphalt binders

Polymers and Plastics Questions

Multiple choice

Find the odd one out.

  1. Polyvinyl chloride

  2. Melamine formaldehyde

  3. Polypropylene

  4. Polystyrene

  5. Polyethylene

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Melamine formaldehyde is a thermosetting plastic. Hence, it is the odd one among the given options.

Multiple choice

What does PTFE stand for?

  1. Polytetrafluoroethylene

  2. Polytetrafluoroethyne

  3. Polytetraformaldehyde

  4. Polyvinyl tetrafluoride

  5. Polystyrene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PTFE stands for polytetrafluoroethylene.

Multiple choice

Bakelite is also known as

  1. polyvinyl chloride

  2. polystyrene

  3. melamine formaldehyde

  4. phenolic

  5. polypropylene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bakelite is also known as phenolic.

Multiple choice

Thermoplastics are those, which

  1. can be remoulded on heating

  2. cannot be remoulded on heating

  3. are prepared from cellulose

  4. are prepared by mixing polyester and cotton

  5. are insulators of heat and electricity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The plastic which can be remoulded on heating is said to be thermoplastic.

Multiple choice

Why are polyethylene terephthalate plastics preferred to make containers for carbonated drinks?

  1. They are very strong.

  2. They are less gas permeable than other plastics.

  3. They are abrasion resistant.

  4. They are glassy transparent materials.

  5. They are the hardest of all plastics.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Polyethylene terephthalate plastics commonly abbreviated as PET are less gas permeable than other plastics. Hence, they are popular materials for making bottles for carbonated drinks. The beverages kept in bottles, made from PET, do not lose their taste for a long time.

Multiple choice

Which of the following statements is incorrect for nylon?

  1. Nylon is thermoplastic in nature.

  2. It is made from coal, water and air.

  3. It is a polymer of an ester.

  4. Its fabrics are wrinkle resistant.

  5. It was first prepared by Wallace Carothers at DuPont chemical company.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nylon is polymer of amine.

Multiple choice

Which of the following polymers are volan and quilon?

  1. Synthetic coordination polymer

  2. Step-growth polymer

  3. Chain growth polymer

  4. Natural coordination polymer

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because the volan and quilon polymer are synthesised on reduction of CrO2Cl2 by methanol or ethanol in presence of carboxylic acid. This yield a solution of synthetic polymer. (R = methacrylate group is called volan, when R = stearate and myristate are called quilon polymer)

Multiple choice

Valeronitrile is polymerised by

  1. metal

  2. peroxide and epoxide

  3. acid

  4. aqueous acid and base

  5. both (2) and (3)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because when nitrile or valeronitrile react with metal or metal compounds, they get easily polymerised with metal.

Multiple choice

Which of the following statements is/are false?

P. Vectran is an aromatic polyester used in the formation of waterproof seat covers. Q. Urea formaldehyde resin is prepared from the condensation reaction of urea and formaldehyde. R. Glyptal is the copolymer of ethylene glycol and phthalic acid.

  1. Only P

  2. Only Q

  3. Only R

  4. P and Q

  5. Q and R
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct answer. Vectran is an aromatic polyester and used as reinforcing (matrix) fibres for ropes, cables, sailcloth and advanced composite materials, professional bike tires and in electronic applications. It is not used in the formation of waterproof seat covers.